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...
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 ♀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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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:...
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...
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...
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...
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....
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...
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...
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...
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...
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...
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...
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...
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...
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,...
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...
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...
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...
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...
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...
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...
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...
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,...
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...
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...
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...
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...
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...
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...
A karyological analysis of Puntius conchonius (Hamilton, 1822) (Pisces, Cyprinidae), a new cytotype from Dal Lake Srinagar Kashmir, Jammu and Kashmir (J&K), India
September 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...
Socio-economic evaluation of rural women and the estimation of profitability of fish marketing in four markets in Nigeria
September 2011
The level of unemployment, poverty, hunger and disease is growing at an alarming rate in developing countries despite global technological and entrepreneurship development. Fish is known to be the most important food commodity handled by rural women in Katcha Local Government area of Niger State because of abundant water from River Niger and streams. This study examined the socio-economic characteristics of...
Effect of beach seine height and mesh size on catch characteristics in the southern part of the Caspian Sea
September 2011
In this study, the influence of height and mesh size of beach seine net on the amount of fishing, length frequency and species composition of caught fish was examined. Two beach seine nets with 20 and 24 m heights and each net with 30 and 33 mm center part mesh size were used by two fishing cooperatives during 2008 and 2009. Rutilus frisii kutum and Mugil auratus were selected as...
Reproductive biology, length–weight relationship and condition factor of the African snake head, Parachanna obscura, from River Oshun, South-west Nigeria
August 2011
Aspects of the biology of the African snake head, Parachanna obscura, obtained from River Oshun, South-west Nigeria, from August 2006 to February 2007, were studied. Fish were captured with gill nets. The species attained a maximum total length of 36.4 cm and body weight of 389.36 g. The length/weight relationship indicated allometric growth for males and isometric growth for females. Gonado-somatic...
Evaluation of some heavy metals in Pangasius hypothalmus and Tilapia nilotica and the role of acetic acid in lowering their levels
August 2011
Concentrations of cadmium, mercury, manganese, phosphorus, lead and zinc in samples of Basa fish (Pangasius hypothalmus) and some fresh water fish (Tilapia nilotica, named Bolti and Karmout) collected from Kafer-El-Zayat were determined. Karmout fish contained the highest level of metals where phosphorus level was 3.45 μg/g, lead (1.51μg/g), zinc (1.03 μg/g), cadmium (0.17 μg/g),...
Aquaculture in Europe: Media representations as a proxy for public opinion
August 2011
Fish is traditionally considered a healthy and pure food. However, with the development of modern aquaculture, a range of potentially controversial issues are emerging. These could significantly impact the future success of the industry. In the absence of in-depth data on lay perceptions on farmed fish and fish farming, this paper utilises media representations as a proxy for public opinion. Media...
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