A prognosis of the causes of vulnerability of Lake Malawi fish resources in Karonga town
June 2017
There is evidence that ammonia, hydrogen sulphide and dissolved oxygen are implicated in fish kills occurring on the Lake Malawi shores of Karonga town. Exposure to fish is influenced by strong winds while water temperature differences cause upwelling and fish mortalities in surface waters. The vulnerability of fish in Karonga town to physico-chemical factors was computed from secondary sources data obtained in 2000 to...
Morphological and genetic variability among Mpasa (Opsaridium microlepis Günther, 1864) populations from the inflow rivers of Lake Malawi
May 2017
Fisheries management continues to be a nightmare due to over exploitation of fish stocks and various anthropogenic activities resulting in a reduction of genetic resources. Opsaridium microlepis, a commercially exploited fish species from Lake Malawi, is no exception, hence it is listed among as endangered species. Opsaridium microlepis stocks from four different rivers, were analyzed using 13 geometric morphometric...
A review of the farming of common carp (Cyprinus carpio L.) in Malawi: Policy research directions for aquaculture development in Malawi
May 2017
The lack of better performing native fish species for aquaculture led the government of Malawi to import the exotic common carp (Cyprinus carpio L.) from Israel in 1976. Growth trials at Domasi and Kasinthula Experimental Stations had shown that common carp grew faster and to a larger size than the indigenous fish species. The government decided to distribute the fish to farmers for grow-out. Barely five years into...
Dietary effect of varying linseed oil compositions on growth response, survival and polyunsaturated fatty acid levels in Tilapia (Oreochromis niloticus)
April 2017
The present study evaluated the impact of varying dietary linseed oil composition on growth, survival and tissue polyunsaturated fatty acids (PUFA) profiles in Nile tilapia (Oreochromis niloticus). Five iso-nitrogenious diets with varying linseed and sunflower oil concentrations were formulated and fish fed twice daily to for 3 months. Commercial diet was used as a control in triplicate tanks set for each diet...
Revisiting the ‘three-pillared design’ of a management system for the Elephant Marsh Wetland Fishery in Malawi
March 2017
This paper revisits and builds on the work of Ishmael Kosamu, Wouter de Groot and Patrick Kambewa who, in 2016, proposed a management system for the Elephant Marsh Wetland Fishery in Malawi, and identified key issues that would help the fishery to be sustainable in the short to medium term. They postulated that a sustainable three-pillared (locally based, weak, and amorphous) institution for the Elephant Marsh Wetland...
Growth performance of Oreochromis variabilis larvae: A case study of effect of live and formulated diets on growth and survival rates
February 2017
Oreochromis variabilis Boulenger (1906) is an indigenous and critically endangered fish species of Lake Victoria. It is among the species targeted for stock enhancement and restoration in Kenya. Such mass stock enhancement requires simple and easily applicable techniques to maximize its larviculture. This study investigated the growth potential of O. variabilis from fry to fingerling stages using diets formulated from...
Evaluation of zootechnical and reproductive parameters of wild populations of Sarotherodon melanotheron Rüppell, 1852 of Southern Benin raised in captivity
January 2017
Tilapia Sarotherodon melanotheron is naturally adapted to both fresh and brackish environments. In order to improve its farming potential, this study evaluated the growth, survival and reproductive parameters of individuals from three lakes of southern Benin according to their sex and age at experimental fishing. During fry rearing and breeding, fish were fed with commercial feed granulated. The chlorophyll a...
Movement patterns of Chilean flounder (Paralichthys adspersus) inside Tongoy Bay (central northern Chile): Observations using passive acoustic telemetry
December 2016
The movement patterns of juvenile and adult Chilean flounder (P. adpersus) were investigated inside Tongoy Bay using ultrasound signal acoustic receivers from June 2012 to March, 2013. Flounder landings in Tongoy Bay and Puerto Aldea from December 2011 to March 2013 were examined. Multiple regression analysis indicated that the Catch per Unit of Effort of Chilean flounder was significantly and negatively related to...
Investigating changes in fish biodiversity in coastal villages of Zanzibar Island, Tanzania
December 2016
This study was conducted at the coastal villages of Zanzibar Island to investigate changes in fish biodiversity. The methodology mostly involved face-to-face interviews and structured questionnaires. Findings of this research paper revealed that there are twenty seven families of fish species of economically importance in the study area of which Scombridae is the most dominate species. This research study shows that...
Preliminary report on “two spot†razor fish, Iniistius bimaculatus (Ruppell, 1829) found in the Chennai coastal waters, southeast coast of India
December 2016
The present study reports the first occurrence of two spot razor fish, Iniistius bimaculatus (Ruppell, 1829) from the Chennai coastal waters, Southeast coast of India. Two specimens measuring 141 mm and 169 mm TL was collected from trawl catches in the Chennai coast during September 2010. A systematic account of this species and a description, colour and notes on its distribution is provided. The controversy of two...
Analysis of growth performance and haematological parameters of Oreochromis niloticus fed on a varying diet of Moringa oleifera Lam. leaf meal as an additive protein source
November 2016
The objective of the current study was to investigate the growth performance and haematological parameters of Oreochromis niloticus fed on four different diets at different Moringa oleifera leaf meal inclusion levels over a period of 33 weeks. The results indicate that Moringa leaf meal causes depressed growth in fish but may increase the immunity of the fish to fight infections and diseases. The four inclusion levels...
Moisture sorption isotherm of Tuna Se’i, smoked with liquid smoke
October 2016
One of the meat products in East Nusa Tenggara is called “se’i”, commonly made from beef, pork, deer meat, and recently have been developed using fish meat. Moisture Sorption Isotherm (MSI) is an important characteristic of food which is almost affected to aspect of the dehydration process and storage stability of the dried product. The aims of this study are to produce tuna se’i using liquid...
First occurrence of the Red Sea goatfish, Parupeneus forsskali (Fourmanoir & Guézé, 1976) in the coastal waters of Egyptian Mediterranean Sea
September 2016
This study discusses the first recorded occurrence of the Red Sea goatfish, Parupeneus forsskali in the Egyptian Mediterranean waters, to the best of the authors’ understanding. On 31 January 2016, a single specimen of this species was captured from Alexandria coastal waters (31°16'N; 30°10'E), Mediterranean Sea, Egypt. The collected specimen represents the first record of P. forsskali in the...
Site suitability assessment of selected bays along the Albert Nile for Cage Aquaculture in West Nile region of Uganda
September 2016
Selection and management of sites are among the most significant elements for the success and sustainability of aquaculture operations. Water quality, water depth and water current are three of the major factors that need to be considered before initiating cage culture in a natural water body. This study was conducted to identify suitable sites for cage farming along the Albert Nile of Uganda by assessing the physical,...
Growth performance of three tilapia fish species raised at varied pond sizes and water depths
August 2016
An on-farm study was conducted in Chingale area in Zomba, Southern Malawi to assess the growth of three tilapia fish species in earthen ponds of different sizes and water depths. The experiment was laid out in a factorial design of 200 and 400 m2 pond sizes, 0.8 and 1.2 m pond water depths, and fish species: Oreochromis karongae, Oreochromis shiranus and Tilapia rendalli, replicated thrice among randomly selected...
Effects of different additives on colorimetry and melanosis prevention of Atlantic seabob shrimp (Xyphopenaeus kroyeri) stored under refrigeration
August 2016
The aim of this work was to evaluate the effect of the food additives, sodium chloride, sodium metabisulfite, sodium nitrite and citric acid on the anti-melanotic activity in shrimp (Xyphopenaeus kroyeri) kept under refrigeration for 13 days post-capture. A sensory panel and color measurements (L*: luminosity, a*: red-green axis saturation and b*: yellow-blue axis saturation) was conducted during storage to evaluate the...
Ovulation induced in African catfish (Clarias gariepinus, Burchell 1822) by hormones produced in the primary culture of pituitary cells
July 2016
This study examined the potential of catfish pituitary cells to proliferate in culture media and that of hormones produced in their primary culture to induce spawning in African catfish. The trypsinized pituitary cells were cultured in three culture media RPMI 1640, McCoy 5a and M2 media with addition of 10% fetal bovine serum. Female catfish (800±200 g) were induced using the culture medium that gave the...
Occurrence of a Pterygoplichthys disjunctivus (Weber, 1991) population in Cauvery River System, Tamil Nadu, South India
June 2016
This study reports the first occurrence of exotic loricariid catfish Pterygoplichthys disjunctivus, introduced for aquarium, in tributaries and fed pond of Cauvery River, Thiruvengadu, Tamil Nadu (South India). The morphological features of P. disjunctivus samples are given and compared with closely related species of the same genus. The observed invasive species is highly aggressive in nature and it was reported to...
Investigation on Food Ecology of three Cichlid Species in the Mankessim Reservoir, Central Region of Ghana
May 2016
The Mankessim Reservoir supports a thriving cichlid fishery that provides both financial gain and nutritional value to the people. Fish samples of Hemichromis fasciatus, Tilapia zillii and Sarotherodon melanotheron were obtained from artisanal fishermen by gill nets (10 m long and 1.5 m deep, 3, 6 and 12 mm mesh) and cast nets (25 mm mesh and 2.5 m radius) in the reservoir (5018''52.08'''N...
Reproductive biology of Blackchin tilapia, Sarotherodon melanotheron (Pisces: Cichlidae) from Brimsu Reservoir, Cape Coast, Ghana
April 2016
This study described some aspects of the reproductive biology of Blackchin tilapia (Sarotherodon melanotheron, Cichlidae) from Brimsu reservoir. A total of 457 specimens were sampled using a monofilament gill net of mesh size 25 mm from September, 2009 to September, 2010. Standard length for the species ranged between 7.5 and 17.6 cm, with both males and females having a unimodal modal length of 10.0 to 10.9 cm. The...
Bioassay using juvenile mysids for rapid assessment of seawater: A case study from Reef HQ Aquarium (Townsville, Australia)
March 2016
Reef HQ Aquarium (Townsville, Australia) pumps its new exhibit seawater from a tidal inlet. This study presents the in-house calibration of a bioassay based on juvenile mysids to do a rapid assessment (presence or absence) of toxicity in the new seawater. Calibration tests were carried out for several substances: copper, sodium lauryl sulphate (SLS or SDS), ammonia, antifouling paint, bilge oil from a yacht, oil from a...
The joint action effects of the binary mixtures of some botanical piscicides on post juvenile Clarias gariepinus
February 2016
Botanical piscicides over the years have been used singly in fishing efforts. This research investigated the joint action of binary mixtures of Carica papaya + Nicotiana tabacum, Anacardium occidentale + Senna occidentalis, and A. occidentale + Luffa cylindrica. Relative toxic units (RTU) estimations and synergistic ratio (SR) models were used in the joint action evaluation. The 96 h LC50 (95% confidence limit [CL])...
Report of fish mass mortality from Lake Hashenge, Tigray, Northern Ethiopia and investigation of the possible causes of this event
February 2016
This study was intended to report the disastrous mass mortality of Nile tilapia (Oreochromis niloticus) and common carp (Cyprinus carpio) in Lake Hashenge, Tigray occurred in June, 12 to 15th, 2014 and to investigate the possible causes of this phenomenon. The dissolved oxygen (DO) of the water of the lake was 2.20 mg/L in the north part and 2.09 mg/L in the south west part of the lake with an average of 2.15 mg/L. The...
Fish assemblage structure in the Tropical Coastal Lagoon of Grand Lahou (Côte D’Ivoire, West Africa)
January 2016
Fish assemblages and their relationship with hydrological variables were investigated in the coastal lagoon of Grand-Lahou (Côte-d’Ivoire) from November 2013 to October 2014. Samplings were carried out by means of artisanal fisheries, once a month, in three sites. A total of 8571 fish belonging to 47 fish species from 25 families were recorded. The most represented families were Cichlidae and Mugilidae with...
Effect of dietary protein levels on ammonia concentration and growth of Tilapia rendalli (Boulenger, 1896), raised in concrete tanks
December 2015
Tilapia rendalli juveniles (±9.5 g) were cultured in concrete tanks to determine the effect of four dietary protein levels (30, 35, 40 and 45% crude protein (CP) in feed on ammonia concentration and growth performance of the fish, stocked at 15 fish per tank. Fish were monitored for a period of 90 days. Fish that were fed on 40% CP diet had significantly (P<0.05) higher weight gain, growth, and feed conversion...
Application of geographic information system for inland fisheries management: A case study of Stratum VII (Yeji Sector), Volta Lake, Ghana
December 2015
A geographic information system (GIS)-modeling of fish production in the Stratum VII of the Volta Lake was undertaken with the objective of investigating temporal changes and modeling fish production into the future. Parameters used included number of canoes, number of fishers, and water level. Stratum VII of the Volta Lake is currently one of the areas with the highest fishing activities, the largest fish market at...
A comparative study of the profitability of brush parks in two states in Nigeria
October 2015
Brush parks consist of branches of trees or shrubs stuck into muddy bottoms of lagoons, lakes or rivers at a depth of 1 to 1.5 m. The branches are placed in water to form aggregations, which are removed after a short lapse of time, together with any fish that may have sought shelter amongst them. Brush parks are found in several of the West African coastal lagoons such as Lagos and freshwater environments in Niger...
Mass production of rotifer (Branchionus calyciflorus) for aquaculture in south-eastern Nigeria
September 2015
In this research, mass production of freshwater rotifer, Branchionus calyciflorus, for aquaculture in south-eastern Nigeria, using different food types (Chlorella sp., Spirulina sp and Baker’s yeast) was investigated. Rotifer stock culture was prepared using Nitrogen phosphorus Potassium, (NPK) + urea (50 : 2.5 g) and chicken droppings (25 g) with freshly grown alga. Different food concentrations (150, 300, 650...
Limitations in decision context for selection of amazonian armoured catfish acari-bodó (Pterygoplichthys pardalis) as candidate species for aquaculture
August 2015
Domestication of native species is essential to development aquaculture. However, complete information on criteria used to categorize fish native species is little available and scarce. The objective of this work is to perform narrative review, critically evaluating the problem to selection of amazonian armoured catfish named acari-bodó (Pterygoplichthys pardalis) as candidate species for aquaculture, assigning...
Differentially expressed genes in the pituitary of the Amazonian fish Arapaima gigas
August 2015
Arapaima gigas, known as pirarucu, is one of the largest tropical freshwater fish and an icon fish species of the Amazon. Many studies on reproduction of A. gigas have been developed but a significant gap persists. To analyze the gene expression profile of A. gigas from wild stocks, four cDNA libraries from pituitary of young and adults of males and females were developed. Among the differentially expressed genes, 97...
A study of optimal utilization of wood resource through alternative use of wood waste in fish smoking
August 2015
This study was conducted to determine and compare the suitability and efficiency of wood wastes (sawdust and wood shavings) as alternative energy sources to fuel wood in fish smoking with a view to enhancing optimal utilization of the wood resource. Fish samples collected were smoked with fuel wood, sawdust and wood shavings using Kainji portable smoking kiln. Proximate compositions of the samples were determined and...
Selectivity studies on beach seine deployed in nearshore waters near Accra, Ghana
July 2015
Beach seine is known to be biologically and ecologically destructive. Over the years there have been increased concerns from fishery managers and stakeholders in West Africa and beyond to reduce this destruction of fish resources by the gear. Total bans for periods in the year or the use of a bigger mesh size (25 mm) at the cod end have been investigated. A covered cod end experiment was conducted in the nearshore...
Nutrient utilization and growth of Clarias gariepinus fed four different commercial feeds
July 2015
Several studies had been conducted on the nutritional requirements of African catfish, Clarias gariepinus. Nevertheless, currently there is a gap about the gross composition of feed ingredients required for formulation of commercial feeds. The aims of this feeding trial were to investigate whether fish fed four different commercial feeds have a significant growth rate and nutrient utilization. A total of 120 fish...
Ecological investigation of zooplankton abundance in the Bhoj wetland, Bhopal of central India: Impact of environmental variables
June 2015
The influence of physicochemical properties of wetland, on its zooplankton composition and abundance were investigated for two years between February 2008 and January 2010. In both the years, total of 62 species of zooplankton were identified. At all the stations of the water body Rotifera recorded the highest percentage of 45% followed by cladocera (29%), Protozoa (13%), Copepoda and Ostracoda (8 and 4%) respectively....
Influence of environmental variables on the relative abundance and habitat use of two sympatric notobranchiid fishes in a tropical stream
June 2015
Effect of environmental variables on the population dynamics of two sympatric notobranchiid fishes, Epiplatys bifasciatus and E. spilargyreius in the seasonal Monai Stream of the Kainji Lake Basin in Nigeria were studied for 24 months. In all, 2,544 and 937 specimens of E. bifasciatus and E. spilargyreius were collected respectively. E. bifasciatus was more abundant of the two species throughout the study period. For...
Photosynthetic productivity and biomass of phytoplankton, in Lake Kuriftu, Ormia Region, Ethiopia
May 2015
Photosynthetic productivity of phytoplankton and chemicals of the water column in Lake Kuriftu were studied from August 2005 to April 2006. The light-saturated rate of photosynthesis (Amax), which was positively and strongly correlated with phytoplankton biomass, ranged from 571 to 1136 mg O2 m-3 h-1. Biomass-specific rate of photosynthetic productivity at light saturation (Pmax) ranged from 18.78 to 33 mg O2 (mg Chl...
Effect of dietary replacement of fishmeal with Chlorella vulgaris on growth performance, energy utilization and digestive enzymes in Macrobrachium rosenbergii postlarvae
May 2015
The present study was conducted to assess the growth promoting ability of Chlorella vulgaris on Marobrachium rosenbergii postlarvae. The experimental diets were prepared by fishmeal replacement with C. vulgaris at different levels (25, 50, 75 and 100%). The prepared feeds were offered to the M. rosenbergii postlarvae during 90 days in triplicate. At the end of the feeding experiment, survival rate, weight gain, specific...
Benefits derived from National Fadama Development Project II by fish farmers in Lagos State, Nigeria
April 2015
This study assessed the benefits derived by fish farmers from Fadama II project in Lagos State by interviewing 185 fish farmers who participated in Fadama II project from 9 Fadama Community Associations (FCAs) through a multistage sampling technique. Data collected with the aid of structured interview guide were analyzed with descriptive statistics and Chi-square. Majority of the fish farmers were male (71.89%),...
Carcass yield and proximate composition of black caiman (Melanosuchus niger) meat
April 2015
The Amazon region is recognized as source of fish for the food industry. The interest in new products made from exotic animal meat has increased. The present study was carried out to evaluate carcass and meat characteristics of Amazon caiman. Samples (n=184) of Melanosuchus niger were collected from a protected area in the Amazonas State (Brazil). The meat was analyzed for proximate composition: Moisture content 78.17%,...
Comparative studies of bacteria load in fish species of commercial importance at the Aquaculture Unit and Lagoon Front of the University of Lagos
April 2015
Bacteria diseases are widespread and can be of particular importance in fish farming. Bacteria exist as micro flora in water until certain environmental conditions such as poor water quality occur, which could impose a stress on fish, thereby making them vulnerable to infection, most especially by pathogenic bacteria. This study was carried out to assess and compare the bacteria diversities and population in Clarias...
Immunostimulatory and anti-oxidative properties of corn silk from Zea mays L. in Nile tilapia, Oreochromis niloticus
March 2015
Corn silks are threads found in the maize plant (Zea mays) and traditionally used to treat urological infections and disorders. Corn silk is also known to possess nutrients and volatile compounds. However, this material is often disregarded and unused. This study therefore investigated the potential use of corn silk in aquaculture through its protective capacity in matured Nile tilapia (Oreochromis niloticus (L.) by...
Food and feeding habits of Mugil cephalus (Linnaeus, 1758) in Elechi Creek, Niger Delta, Nigeria
March 2015
The present study is aimed to provide information on the abundance of natural foods needed by Mugil cephalus in the Elechi Creek. The natural food of M. cephalus in the Elechi Creek was studied from stomach contents of the fish. The stomach contents were analyzed using two methods; the frequency of occurrence and numerical methods. Plant materials, diatoms, algae and dinoflagellates constituted its main food. Plant...
Morphometric and developmental characteristics of fish landed by artisanal bait fishers at the Mida Creek, Kenya
February 2015
Although artisanal commercial and net fishers landings has received attention, the morphometrics of bait fisher landings is poorly documented. This is in spite of the importance of such data to infer fished stock growth and developmental status in order to reduce excessive removal of immature and highly fecund fish. This study compares fish species, size and weight, and derived fish condition, Gonadosomatic and Fishing...
Some aspects of reproductive biology on effect of heavy metal pollution on the histopathological structure of gonads in Labeo rohita (Hamilton-Buchanan) from Harike wetland, India
February 2015
Water pollution caused by heavy metals affects breeding and development in fishes of Harike wetland. The effects of heavy metals on fishes are related to their uptake and accumulation by the organism, resulting in metal induced disturbances in the structures and functions of various tissues and organs. Early life stage of fish development, such as oocytes maturation is very sensitive to intoxication. Samples of the fish...
Parasitic prevalence of fresh water shrimp (Atya gabonensis) in lower Benue River, Makurdi
January 2015
The study investigated the parasitic prevalence of freshwater shrimps (Atya gabonensis) in the lower Benue River for a period of six months (March – August, 2012) during which a total of 1000 shrimps were sampled randomly from the landing sites of the River Benue and were analyzed at the parasitology laboratory of the verterinary teaching hospital, University of Agriculture, Makurdi. The gills of shrimps had the...
Bacterial population in intensive tilapia (Oreochromis niloticus) culture pond sediment in Hai Duong province, Vietnam
December 2014
Three intensive tilapia ponds were studied to determine the bacterial population during the culture period in Hai Duong province, Vietnam. Bacteria were identified to genus or species level. Total bacteria count in sediment ranged from 6.49 × 105 to 1.29 × 106 cfu g-1. In total, 11 bacterial genera and 13 species were identified from pond sediments, in which both gram-negative and gram-positive rod-shaped...
Morphometric relations, diet composition and ontogenetic dietary shift of Labeobarbus intermedius (Rüppell, 1836) in Lake Tana gulf of Gorgora, Ethiopia
November 2014
Morphometric relations, feeding habits and dietary shifts of Labeobarbus intermedius in Lake Tana at gulf of Gorgora were studied during the dry season. A total of 250 fish ranging from 13.2 to 43.8 cm total length (TL) and 73.4 to 742.8 g total weight (TW) were randomly sampled from the lake. The data generated from both morphometric parameters were analyzed using SPSS (Version 20) and expressed using least square...
Genetic relationships between captive and wild subpopulations of Arapaima gigas (Schinz, in Cuvier, 1822)
October 2014
Arapaima gigas, also known as pirarucu, is endemic to the Amazon basin. There is currently considerable effort being made to cultivate this species to reduce pressure on natural populations. We characterized the diversity and genetic structure of subpopulations of wild and captive A. gigas based on 19 microsatellite loci. Captive subpopulations of A. gigas exhibited less diversity than wild individuals. We also verified...
Parasites of some fishes (Labeo rohita and Schizothorax niger) of Jammu and Kashmir in India
September 2014
The present study has been carried out to find out the parasites of Schizothorax niger and Labeo rohita during different months of the year 2013 to 2014. Parasites belonging to two groups viz. ciliophoran (Chilodonella) and crustacean (Argulus) were recorded from 200 fishes of Rohu (L. rohita) and S. niger collected from different parts of Jammu and Kashmir. These two parasites belong to Ectoparasitic group and no other...
Implementing a unified methodology for fisheries management (UMFM) in fresh water in Morocco
August 2014
The ecosystem approach for fisheries management in fresh water is based on the application of appropriate methodologies and tools to promote sustainable production of goods and services with least possible environmental impact and the highest possible economic and social yield. In this paper, we develop a unified methodology for fisheries management (UMFM) in fresh water in Morocco in order to better plan,...
Page 2 of 5, showing 50 records out of 228 total, starting on record 51, ending on 100
Advertisement
Advertisement
