International Journal of
Fisheries and Aquaculture

  • Abbreviation: Int. J. Fish. Aquac.
  • Language: English
  • ISSN: 2006-9839
  • DOI: 10.5897/IJFA
  • Start Year: 2010
  • Published Articles: 234

IJFA Articles

Recent changes in fish communities of the equatorial Lake Naivasha, Kenya

April 2013

Changes in fish species composition and abundance in Lake Naivasha were investigated monthly for a period of 12 months. Data were obtained both from experimental surveys as well as commercial fish landings. The structure metrics considered included species abundance and composition, length- frequency and physico-chemical attributes. Results of the study showed that the fishery is currently dominated by the recently...

Author(s):   Aloo P. A., Oyugi D. O., Morara G. N. and Owuor M. A.

The effects of replacement of fish-meal with crab-meal on growth and feed utilization of African giant catfish Heterobranchus longifilis fingerlings

April 2013

A feeding experiment was conducted in plastic aquaria (46 ´ 38 ´ 28 cm3) to investigate the effect of replacing fish-meal (FM) with crab-meal (CM) on growth, feed utilization and body composition of Heterobranchus longifilis fingerlings with body weight, 3.11 ± 0.56 - 8.48 ± 1.70 g and total length, 73.07 ± 4.99 - 98.69 ± 7.64 mm. Fish and crab-meal were separately used to produce...

Author(s): Reginald Inodu Keremah

Temperature-dependent egg development rates, hatchability and fry survival rate of Lake Malawi Tilapia (Chambo), Oreochromis karongae (Pisces: Cichlidae)

April 2013

A study was conducted to assess the effect of temperature on egg development in an attempt to improve hatching success and fry production in Oreochromis karongae. Temperature-dependent development rates and hatching period for fertilized eggs stripped from O. karongae, a mouth brooder, were determined in a recirculating system set up in a hatchery at the National Aquaculture Center, Domasi, Malawi. Three...

Author(s): Valeta J. S., Likongwe J. S., Kassam D. and Maluwa A. O.

Effects of smoke-drying temperatures and time on physical and nutritional quality parameters of Tilapia (Oreochromis niloticus)

March 2013

Effects of smoke-drying temperatures and duration of drying on the quality of Nile tilapia (Oreochromis niloticus) samples were investigated by smoke–drying Tilapia fish under three different temperatures (50, 60 and 70°C) and three drying times (5, 10 and 15 h) using modified drum kiln dryer. The proximate compositions of the fresh and dried fish were evaluated and the sensory evaluation of the organoleptic...

Author(s): Idah, Peter Aba and Nwankwo, Ifannyi

Comparative growth performance of male and female freshwater prawn Macrobrachium tenellum (Decapoda: Palaemonidae) cultured in tropical earthen ponds

March 2013

The purpose of the present study was to determine the performance growth and yield of male and female Macrobrachium tenellum, cultured in earthen ponds. A total of 6 earthen ponds containing 1,400 ± 50.0 m2 of water and a depth of 0.85 m were used. A total of 19,600 juvenileM. tenellum were introduced into each pond to a stocking density of 14 org m-2. The final length, final weight, specific...

Author(s): Jesús T. Ponce-Palafox, Fermín López Uriostegui, Mario Alfredo Benítez Maldujano, Sergio Castillo Vargasmachuca, Aurelio Benítez Valles, Julio Gómez Gurrola and José Luis Arredondo-Figueroa

Evaluation of soybean meal as protein source for Argyrosomus Regius (Asso, 1801) (Sciaenidae)

March 2013

The meagre (Argyrosomus regius) is a carnivorous fish which requires diets with higher protein content, causing an increment in diets cost. A way to diminish this cost is to use vegetable meals like soybean meal (SB). So the aim of this trial was to determine the optimum inclusion level of defatted soybean meal in experimental diets for this species. 800 fishes (165 g) were distributed in 8 tanks, two replicates per...

Author(s): Jorge Velazco-Vargas, Silvia Martínez-Llorens, Miguel Jover Cerda and Ana Tomás-Vidal

Production and marketing systems of farmed tilapia in China

February 2013

Tilapia has become one of the major species of aquatic products in close link with both domestic and international markets. Nowadays, the demand for fish and fisheries product has being exacerbated by the continued increase in human population the world over. This was due to the fact that global captured fishery was declining following the increased human exploitation for the commercially important...

Author(s):   Matlala Moloko P., Kpundeh Mathew D., and Yuan Yongming,

Utilization of the earthworm, Eudrilus eugeniae in the diet of Heteroclarias fingerlings

February 2013

The earthworm, Eudrilus eugeniae was cultured for 12 weeks and its meal utilized as a replacement for fish meal in the diet of fingerlings of the mud catfish hybrid (♂Heterobranchus longifilis X â™€Clarias gariepinus) called Heteroclarias. Two hundred and seventy adult E.eugeniae were cultured in three substrates: Soil, cellulose, or a mixture of cellulose and soil. The worms...

Author(s): C. O. Monebi and A. A. A. Ugwumba    

Toxic effect of potassium permanganate on Oreochromis niloticus based on hematological parameters and biomarkers of oxidative stress

January 2013

Potassium permanganate (KMnO4) is an oxidizing agent used in aquaculture for many years. Despite its known efficacy for the treatment and prevention of fish diseases, information about their potential toxicity in non-target organisms is still very limited. The objective of this study was to evaluate the sublethal effects of potassium permanganate (1.0 and 4.0 mg L-1) on Nile tilapia, Oreochromis niloticus, using...

Author(s): Ranzani-Paiva, Julio V. Lombardi, Solange de Carvalho, Francisco Filipak-Neto and Ciro A. Oliveira-Ribeiro

Comparative survey of helminth parasites of Clarias gariepinus (Burchell, 1822) and Clarias pachynema (Boulenger, 1903) from the Ogun River and Asejire Dam in south-west Nigeria

January 2013

A total of 250 randomly selected fish specimens consisting of 72 Clarias gariepinus and 51Clarias pachynema from Ogun River around the cattle market, Isheri, Ogun State. 73 C. pachynema and 54 C. gariepinus from Asejire Dam (which has not been reported to be polluted) in south-west Nigeria were sampled for helminth infection between September 2008 and February 2009. All...

Author(s):   Jakeline G. França, Maria J. T. Salawu M. T., Morenikeji O. A., Sowunmi A. A. and Odaibo A. B.

Evaluation of a fast and simple method for measuring plasma lactate levels in Atlantic cod, Gadus morhua (L.)

December 2012

  The aim of the present study was to investigate the validity of measuring circulatory lactate levels in plasma from Atlantic cod using Lactate ProTM, a portable meter described for measuring whole blood lactate in this species. Atlantic cod were either unstressed or subjected to short- or long-term crowding stress. Whole blood was analyzed on site, and a strong positive relationship was evident between...

Author(s): Rosa M. Serra-Llinares, Helge Tveiten, Børge Damsgård and Øyvind Aas-Hansen

Histomorphological and anatomical study of kidney in berzem (Barbus pectoralis)

December 2012

  The kidney of the vertebrate is the main organ which balances the body fluid homeostasis.Barbus pectoralis (Cyprinidae) inhabit Karoon River (Southwest Iran). There was no available report on anatomy and histology analysis of B. pectoralis. So in this study, the morphologic and microscopic features of kidney of B. pectoralis were recognized. A total number of 10 young fish freshly prepared...

Author(s): Hassan Morovvati, Mahmood Khaksary Mahabady and Saied Shahbazi

Serum protein pattern in interspecific and intergeneric hybrids of Heterobranchus longiflis, Clarias gariepinus and Clarias anguillaris in sodium dodecyl sulphate polyacrylamide gel electrophoresis (SDS-PAGE)

November 2012

  Electrophoretic characterization of Heterobranchus longifilis, Clarias gariepinus, Clarias anguillaris and their intergeneric and interspecific hybrids were carried out using 12% sodium dodecyl sulphate polyacrylamide gel electrophoresis (SDS-PAGE). Twenty seven fish samples (three from each mating combination) were used and a total of 16 electrophoretic protein bands were...

Author(s): Akinwande A. A., Fagbenro O. A. and Adebayo O. T.

Rheological and structural properties of sea cucumber Stichopus japonicus during different heating temperature

November 2012

  Changes in tissue structure and rheological properties of sea cucumber meat during different heating temperature were studied. Tissue structure was observed using an optical microscope and scanning electron micrograph, and its characteristic values (Wm, Dm, Rm, C*) were enumerated using image processing and analysis technique. Rheological properties (E0, τ1, η1, rupture strength) and Texture...

Author(s): Lianfeng Liu, Zhaohui Zhang, Qian Liu, Bofeng Yang, Jinfa Huang and Xin Gao

Oomycete infections in freshwater fishes

October 2012

  Mycological studies were carried out on fishes with fungal infection. A total of seventeen isolates of fungi were obtained from diseased fishes which belongs to five species namelySaprolegnia diclina, Saprolegnia ferax, Saprolegnia hypogyana, Saprolegnia parasitica andAchlya americana. All these fungi were isolated from six different species of fishes viz.Channa striatus, Channa punctatus, Clarias...

Author(s): S. A. Mastan, M. Radha Krishna Reddy and D. Sri Lakshmi

Chemical composition of five marine microalgae that occur on the Brazilian coast

October 2012

  Five native species of marine microalgae were batch cultured and their chemical composition was measured in different growth phases. The highest cell yield was recorded in Chlorellasp. Chlorella sp. and Bellerochea sp. showed a reduction of the mean cell volume throughout growth. All microalgae showed protein as the main chemical component, with peaks in the exponential...

Author(s): Giselle S. Costard, Rodrigo R. Machado, Elisabete Barbarino, Ricardo C. Martinoand Sergio O. Lourenço

The biology of Parachanna obscura (Osteichthyes: Channidae) in Anambra River, Nigeria

September 2012

  The biology of a commercially important teleost, Parachanna obscura was studied for a period of twelve months. Monthly samples of the species were randomly collected from fishermen in the lower reaches of Anambra River, Southeastern Nigeria for the twelve months. The haematological profile established were mean haematocrit of 22.5%, mean blood haemoglobin concentration of 7.23 g/dl, mean red...

Author(s): Odo, Gregory E., Onoja S. U. and Onyishi Grace C.

Evaluation of physicochemical parameters of waste water from rainbow trout fish farms and their impacts on water quality of Koohrang stream – Iran

September 2012

  Physicochemical parameters of rainbow trout farm water were evaluated to assess the potential of fish farm effluents on stream water quality. Seven fish farms were selected at Rostamabad region located on 70 km at south-west of Shahrekord-Iran. Water samples were collected from fish farms inlet and outlet at first and second sampling point. Significant differences were observed in some water factors such as...

Author(s):   Firooz Fadaeifard, Mehdi Raissy, Mostafa Faghani, Alireza Majlesi and Gholamhossein Nodeh Farahani

Effects of feeding fry of Oreochromis niloticus on different agro-industrial by-products

September 2012

  This study was conducted at the Aquaculture Research and Development Centre at Akosombo, to observe the growth and economic performance of fry of Oreochromis niloticusfed on different dietary treatments. In the experiment, four isonitrogenous (36% crude protein) and isoenergetic (physiological fuel value gross energy (GE), 18 MJ/kg) diets were formulated to contain agro-industrial by-products...

Author(s): Emmanuel Delwin Abarike, Felix Yao Klenam Attipoe and Elliot Haruna Alhassan

Macroinvertebrates in streams: A review of some ecological factors

August 2012

  Macroinvertebrates are an important component of stream ecosystems and are a link in the transfer of material and energy from producers to top level consumers and also act as excellent bioindicators of stream health. This review discusses some of the factors whichregulate the occurrence and distribution of stream macroinvertebrates namely water current, temperature, substrate, drainage...

Author(s): Qazi A. Hussain and Ashok K. Pandit

Attitudinal analysis of women involvement in fish processing and marketing in Ondo State

August 2012

  Generally, it is believed that attitude, to an extent, determines participation in any vocation. This study sets out to investigate and analyze the attitude of women involved in fish processing and marketing in Ilaje Local Government Area (LGA) of Ondo state. The study also determined the profitability and constraints faced by the respondents in the business. The influence of selected respondent’s...

Author(s): S. D. Yomi Alfred, O. O. Odefadehan and M. E. Ukut

Toxicity of Parkia biglobosa pod extract on Clarias gariepinus juveniles

August 2012

  The toxicity of aqueous and ethanolic extracts of Parkia biglobosa pods (95, 85, 75, 65 and 55 mg/l) on Clarias gariepinus was investigated under laboratory condition over a 96 h exposure period. Fish exposed to both extracts exhibited clinical signs including eventual death but was not observed in the control fish. Weight change in fish was observed as well as the effect of the...

Author(s): R. O. Ojutiku, E. P. Avbarefe, R. J. Kolo and F. P. Asuwaju

Socio-economic characteristics of fish workers in Western Kenya

August 2012

  This paper analyzes and discusses the socio-economic characteristics of fish workers, with a focus on those based on the Kenyan shores of Lake Victoria. In particular, the paper considers the characteristics of fish workers in general and by type of fish work, beach location and income diversification strategy. Although, many characteristics of the fish workers were identified, six characteristics stood out:...

Author(s): Edward Olale and Spencer Henson

Effect of repeated partial cropping on population dynamics and yield of Oreochromis niloticus (L.) during polyculture with Heterobranchus longifilis (Val.)

July 2012

The effect of repeated cropping of half the number of young and large adults on productivity and dynamics of Oreochromis niloticus was investigated during polyculture with Heterobranchus longifilis. Mixed-sex, large-sized and young adult tilapia of 841±0.3 g and 841±0.23 g were cultured with 40 catfish fingerlings in triplicate 36 m2 earthen ponds in 1 and 2 treatments respectively. At...

Author(s): Chukwuma O. Ofor, Udo I. Udo and Michael O. Udoidiong

Aspects of the biology of trap caught Chrysichthys nigrodigitatus (Lacepede: 1803) from the New Calabar River, Nigeria

July 2012

  Length and weight measurements of a population of 513 specimens of trap-caughtChrysichthys nigrodigitatus  harvested between January and July (excluding May), 2010 were analyzed using the following softwares; FiSAT (Fish Stock Assessment Tool) and Popdyn JFB.xls. Results of the sampled population gave a total length range of 18 to 95 cm,  Lmax (113.8 cm), L∞ (116.8 cm), Lm (60 cm), Lopt...

Author(s): A. Francis and U. Elewuo

Microplanktic assemblages (sarcodines and alveolates) in the central and southeastern Aegean Sea (NE Mediterranean)

July 2012

  Spatial changes in the structure of microplanktic assemblages (sarcodines and alveolates) in the surface waters of coastal regions in the central and southeastern Aegean Sea were estimated during late summer to early autumn. Tintinnidae (Ciliophora), as well, Acanthometridae (Radiolaria) and Globiderinidae (Foraminifera) exhibited a higher abundance in the central Aegean Sea, compared to that in the more...

Author(s): H. Miliou, K. Kapiris and I. Castritsi-Catharios

Evaluation of experimental infection with Aeromonas hydrophila in pacu (Piaractus mesopotamicus) (Holmberg, 1887)*

April 2012

  The aim of this work is to determine the concentration of Aeromonas hydrophila to be inoculated in pacu (Piaractus mesopotamicus), so as to induce bacterial infection but not death during a period of at least ten days and, therefore, enable the development of treatment protocols. The tested concentrations were established through the Mac Farland scale and fish were subjected to three A....

Author(s):   Silvia Patrícia Carraschi, Claudinei da Cruz, Joaquim Gonçalves Machado Neto, Flávio Ruas de Moraes,  Oswaldo Durival Rossi Júnior, Antonio Nader Neto and Neida Lucas Bortoluzzi

The effects of replacement of soybean meal by shrimp shell meal on the growth of hybrid tilapia (Oreochromis niloticus x Oreochromis aureus) reared under brackish water

April 2012

  To evaluate the effects of complete replacement of soybean meal (SBM) protein by shrimp shell meal (SSM) on the growth performance of hybrid tilapia (O. niloticus x O. aureus), five approximately isoenergetic and isonitrogenous (30% crude protein) diets containing 0, 33, 50, 67 and 100% SSM were fed to triplicate groups of ten fry with an initial mean weight 1.54 ± 0.03 g/fish under brackish water (15...

Author(s): Jean Fall, Yi-Theng Tseng, Diegane Ndong and Shin-Shyn Sheen

Economic analysis of fish hatchery operations in Ogun State, Nigeria

March 2012

  This paper examines the cost and returns, and the determinants of fish hatchery operations in agricultural extension zones of Ogun state. The simple random sampling method was used in selecting 120 fish hatchery operators out of 388 registered ones using multi-stage sampling techniques. The primary data were collected in 2010 production season with the aid of well-structured, validated and pre-tested...

Author(s): Olaoye Olalekan Jacob and Oke Abdulfatai Olubukola

Bioactivity of venom extracted from the sea anemone Anthopleura asiatica (Cnidaria: Anthozoa): Toxicity and Histopathological studies

March 2012

  The bioactivity of the venom from a locally available sea anemone, Anthopleura asiaticacollected from the Mumbai coast was studied. The crude venom from sixty sea anemones (Sixty numbers) was extracted in aqueous medium. The protein content of the crude venom was 4.3459±0.027 mg/ml. The crude venom was found to be lethal at 1ml when injected intra-peritoneal to kasuali strain male albino...

Author(s): Ramkumar S., Arun Sudhagar S. and Venkateshvaran K.

Nitrite intoxication of Clarias gariepinus at different water temperatures

March 2012

  Clarias gariepinus (Burchell, 1822) of mean weight 320±11.2 g and total length 60.0±1.0 cm were exposed to nitrite (0.2 mg/l NO2) for 48 h at 27 and 35°C in order to investigate the effects of nitrite poisoning at these water temperatures. The effects of nitrite exposure on fish was assessed on selected haematological and biochemical indicators of the blood. The test was performed in a...

Author(s): Ajani Funmilola and Adeyemo Olanike Kudirat

Effect of dietary protein, lipid and carbohydrate contents on the growth, feed efficiency and carcass composition of Cyprinus carpio communis fingerlings

February 2012

  This study aimed to determine a feed formulation with best protein to energy ratio which would result in better growth, feed efficiency and carcass composition of Cyprinus carpiocommunis. Fingerlings having average weight 1.64 ± 0.13 g and length 5.26 ± 0.10 cm were fed on four different formulated feeds and a control feed (each in a triplicate set), 6% of their body weight, three times a...

Author(s): Muzaffar Ahmad, Qureshi T.A., Singh A.B., Susan Manohar, Kamlesh Borana and Salman Rouf Chalko

Selectivity and fish catches of gillnets in stratum VII (Yeji sector) of Lake Volta for sustainable management

February 2012

  The study was conducted in Stratum VII (Yeji sector) of Lake Volta where commercial fishermen arbitrarily use gillnets, from June, 2009 to March, 2010. The catches of monofilament gillnets, the most dominant gear used in Stratum VII were investigated for dominant fish species composition and selectivity parameters. The study revealed the dominance of two fish species (Synodontis...

Author(s): Daniel N. Akongyuure, Patrick K. Ofori-Danson and Francis K. E. Nunoo

Diversity of the edible fishes of the Lagos Lagoon, Nigeria and the public health concerns based on their Lead (Pb) content

February 2012

  In this study, a total of eighteen fish species were recorded in the Lagos Lagoon, Nigeria during a one year survey. Among the animals species recorded, the following, Galeoidesdecadactylus, Dentex gibbosus, Elops lacerta, Scomber japonicus, Ethmalosa fimbriata, Lutjanus agennes, Caranx senegallus, Callinectes amnicola, Paeneus notialis and Mytilus edulis were considered to be abundant in...

Author(s): F. E. Ajagbe, A. O. Osibona and A. A. Otitoloju

Growth response and ionic regulation in common carp (Cyprinus carpio L.) after chronic dietary copper exposure and recovery

January 2012

  Effects of exposure of common carp juveniles (Cyprinus carpio L.) to dietary copper and its recovery rate were investigated with the aim of determining the growth and physiological impact. The fish were fed elevated copper diets (1000 and 2000 mgCukg-1 as diet 2 and diet 3 respectively) and control diet (5 mgCukg-,  as diet 1) for 42days and were then fed the control diet for a further...

Author(s): Ajani, E. K and Akpoilih, B. U

Effect of dietary protein, lipid and carbohydrate contents on the liver composition and enzyme activity of Cyprinus carpio communis fingerlings

January 2012

  This study aimed to determine a feed formulation with best protein to energy ratio which would result in better liver composition and enzyme activity of Cyprinus carpio communis. Fingerlings having average weight 1.64 g ± 0.13 and length 5.26 ± 0.10 cm were fed on four different formulated feeds and a control feed (each in a triplicate set), 6% of their body weight, three times a day,...

Author(s): Muzaffar Ahmad., Qureshi T. A. and Singh A. B.

Effect of dietary carbohydrate to lipid ratios on growth, feed conversion, protein utilisation and body composition in climbing perch, Anabas testudineus

January 2012

  An 8-week feeding trial was conducted in a static indoor rearing system with 15 cylindrical fibre glass tanks (80 cm diameter, 75 cm deep, 70-L each) to investigate the optimum carbohydrate to lipid ratio (CHO:L ratio) in climbing perch, Anabas testudineus (2.15 ± 0.07 g). Five isonitrogenous (40% crude protein) and isoenergetic (17.71 kJ g-1 gross energy (GE)) fishmeal based...

Author(s):     M. Z. Ali, M. Zaher, M. J. Alam and M. G. Hussain

The sediment characteristic and benthic macro-invertebrate fauna of some fish ponds in Ife north local government area (LGA), Nigeria

January 2012

  This study investigated the sediment characteristics as well as the taxonomic composition of macrobenthic invertebrate faunae of some ponds in Ife north local government area,(LGA) Nigeria. The sediments were generally sandy, moderately acidic (pH range of 3.8 to 5.8) and well drained. The organic carbon of the sediment were within the usual range of 0.5 to 5% organic carbon while the nutrients...

Author(s): A. A. Adedeji, I. F. Adeniyi and O. R. Adetokunbo

Histopathology of Nile Tilapia (Oreochromis niloticus) juveniles exposed to aqueous and ethanolic extracts of Ipomoea aquatica leaf

December 2011

  The effect of aqueous and ethanolic extracts of Ipomoea aquatica leaf on the histopathology of selected organs of the fresh water Oreochromis niloticus was investigated. The differential acute toxicity of aqueous and ethanolic extracts of I. aquatica leaf on Nile Tilapia,O. niloticus were carried out under laboratory conditions.  The LC50 after 96 h of...

Author(s): Ayoola Simeon Oluwatoyin

Rheological changes of sea cucumber Stichipus japonicus during different heated times

December 2011

  Changes in tissue structure, weight, volume and rheological properties of sea cucumber meat were studied. Sea cucumber Stichopus japonicus was heated at 70°C for 1, 2, 6, 10 and 24 h, respectively. Microscopic photograph revealed that the structure has significant changed. When heated from 1 to 24 h. The weight, volume, rupture strength, and elastic moduli of sea cucumber meat decreased...

Author(s): Xin Gao, Zhaohui Zhang, Lianfeng Liu and Qian Liu

Morphometric measurements and growth patterns of four species of the genus Synodontis (cuvier,1816) from Lower Benue River, Makurdi, Nigeria

December 2011

  Relationship between basic morphometric measurements and growth pattern of four species of Synodontis from Lower Benue River was investigated bi-monthly from February toOctober, 2009 to determine variations and differences in the growth pattern of the different populations. Morphometric parameters of a total number of 195 specimens of Synodontisclarias, Synodontis...

Author(s): Akombo P. M., Atile J. I., Adikwu I. A. and Araoye P. A.

Profitability analysis of small scale aquaculture enterprises in Central Uganda

December 2011

  The study had three overriding objectives. Firstly, to assess the profitability of small-scale aquaculture production enterprises in central Uganda; secondly, to ascertain the factors affecting profitability; and thirdly, to identify the constraints to fish farming in the region.The data were collected through a survey questionnaire administered to a random sample of 200 small scale fish farmers in the three...

Author(s): Theodora S. Hyuha, James O. Bukenya, Julius Twinamasiko and Joseph Molnar

Effect of stocking density on nutritive value of natural food and growth performance of Oreochromis niloticus (Linnaeus, 1758) reared in extensive aquaculture ponds

November 2011

  The effects of stocking density (0.1, 0.5, 1 and 1.5 fish.m-2) on the nutritional value of the natural food source (total suspended solid (TSS) and sediment), diet quality and growth performance of fingerlings of Oreochromis niloticus were studied in ponds. The nutritional value of TSS expressed in terms of hydrolysable organic matter (HOM) and total amino...

Author(s): Célestin M. Blé, Laurent Y. Alla, Antoinette A. Adingra, Sébastien Niamké and Jacques K. Diopoh

Parasites of landed fish from Great Kwa River, Calabar, Cross River State, Nigeria

November 2011

  Parasites of landed fish from the Great Kwa River, Calabar, Cross River State, Nigeria were studied. Parasitological examination of 180 fish samples belonging to 9 taxa from the River showed 50% incidence for Chrysicthys nigrodigitatus, 16.67% for Heterotis noloticus, Clarias gariepinus and Tilapia galileaus respectively and 0% for Hepsetus odoe, Arius gigas, Momyrus rume,...

Author(s): Ekanem A. P., Eyo V. O. and Sampson A. F.

Food and feeding habits of Ophiocephalus obscura (African snakehead) in the Cross River estuary, Cross River State, Nigeria

November 2011

Studies conducted on the food and feeding habits of Ophiocephalus obscura in the Cross River estuary, Cross River State, Nigeria, between February and April, 2009 revealed that the species feed mostly on food from animal origin, although diatoms and other plant materials were also identified. A total of 149 plant materials (15.95%) and 77 diatoms (8.24%) were consumed by the species. Food from animal origin...

Author(s): George Ubong Uwem, Ekanem Albert P. and George Eni

Comparative effects of crude oil on juveniles Clarias gariepinus and Clarias anguillaris

November 2011

  This study was based on biochemical assessment of the effect of crude oil spillage on marine life. Hence, life sustaining indices such as pH, dissolved oxygen (DO), and free CO2 were analyzed in aquaria. However, a 96 h static acute toxicity test was also investigated on the juveniles Clarias gariepinus (African catfish) and Clarias anguillaris(mudfish) on exposure to different...

Author(s): Awoyinka O. A., Atulomah E. and  Atulomah N. O. S.

Reverse transcriptase polymerase chain reaction is a sensitive diagnostic tool for detection of nodavirus infection in Macrobrachium rosenbergii

October 2011

  Macrobrachium rosenbergii is the most important cultured Palaemonid in the world. It is farmed on a large scale in many countries including India, once upon a time this species was considered as disease free animal but towards the later part of 2001, the hatchery and nursery pond of these animals suffered a massive loss due to a new viral disease named white tail disease. Till date different diagnosis...

Author(s): D. P. Behera, K. Devdas and L. Nayak

Growth and nutrient efficiency of meagre (Argyrosomus regius, Asso1801) fed extruded diets with different protein and lipid levels

October 2011

  Four commercial diets containing different levels of crude protein and crude lipid (44/25, 43/21, 46/20 and 47/20%) were assayed in duplicated groups in juvenile meagre (Argyrosomus regius) (initial individual weights were 94 g) in an experiment lasting 173 days. The essential amino acid contents (expressed in g/kg of diet basis) in diets 46/20 and 47/20 were higher than in diets 44/25 and...

Author(s): Silvia Martínez-Llorens, Javier Espert, Javier Moya, Miguel Jover Cerdá and Ana Tomás-Vidal

Fish colonization of artificial reefs in the Persian Gulf (Bandar Lengeh-Iran): Reef designs and seasonal changes of fish abundance

October 2011

  Artificial reefs are used as a management tool to compensate for overfishing and anthropogenic degradation. In the present study, to find the best artificial structure for enhancing of fish yields, the values of total fish catch and its seasonal changes were investigated in different forms of artificial structures placed in costal waters of Persian Gulf (Bandar-e-Lengeh-Iran). For this purpose, eight...

Author(s): Daniel Ajdari, Saeed Hajirezaee and Zahra Ajdari

A karyological analysis of Puntius conchonius (Hamilton, 1822) (Pisces, Cyprinidae), a new cytotype from Dal Lake Srinagar Kashmir, J&K, India

October 2011

  The karyotypic and cytological characteristics of Rosy barb, Puntius conchonius (Hamilton, 1822) (cyprinidae) were investigated by examining metaphase chromosomes spreads from the anterior kidney following Thorgaard and Disney (1990). The fishes were obtained from the local fishermen and transported live to the Limnology and Fisheries Laboratory of Centre of Research for Development, University of...

Author(s): Farooq A. Ganai and A. R. Yousuf

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