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This study assessed the Length-Weight relationship and reproductive biology of Oreochromis niloticus (Linnaeus, 1757) in Lake Shala, Ethiopia. A sample of 343 fish from 7.70 cm to 33 cm Total Length (TL) and from 7.80 g to 708.21 g Total Weight (TW) were collected between January and December, 2018 using a gill net. The Length-Weight relationship was curvilinear (TW = 0.0104TL3.19, R2 = 0.98. n = 343) and indicating...
Cage fish culture in the Lake Victoria Region: Adoption determinants, challenges and opportunities
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Fish cage farming was first introduced in Lake Victoria in 2005, however, its adoption and production has not met expectations. It is a promising venture that can help solve the problems of food insecurity, unemployment and alleviate poverty if a conducive investment environment is put in place. This study sought to explore the adoption determinants, challenges and opportunities of this technology within the Lake Victoria...
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The impacts of climate variability and change on natural resources-based livelihoods has increased in magnitude, frequency, and intensity; and fisheries-based livelihood is no exception. Vulnerability assessment has significant policy implications in prioritizing adaptation assistance, allocation of resources, and monitor progress over time. Hence, there is a dire need for an in-depth understanding of its vulnerability to...
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Food is necessary for good health as well as the social and political stability of the society. Fish food provides essential nourishment especially proteins of high biological values. It is highly nutritious, tasty and easily digestive. Enterprise budgeting and descriptive statistics were used to estimate the value of smallholder aquaculture systems on a census population using a semi-structured questionnaire in the South...
Socioeconomic consequences of fishermen migration in Yauri Local Government Area Kebbi State
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Studies have been conducted in the past on the causal factors of fishermen migration but what were left un-researched are the after effects of their migration on their dependants. This research focused on the rural out migration of artisanal fishermen in Yauri Local Government Area to varied destinations within and outside Nigeria. In order to achieve the stated objectives this research examined the following areas as...
Impacts of feeding restriction regimes on economic and productive performance of Nile Tilapia fish
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The study investigated the effect of feeding restriction regimes on economic and productive performance of Nile tilapia Oreochromis niloticus. Sixty Nile tilapia fish were randomly classified into three groups (n=10/group) with similar initial body weight. Group I (Control group) was fed three times daily for 32 days. Group II was deprived for 4 days and then re-fed for 16 days, while Group III was deprived for 8 days and...
Can pleco Pterygoplichthys etentaculatus (Spix & Agassiz, 1829) select their favourite vegetable?
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This study evaluated the feeding preferences of Pterygoplichthys etentaculatus reared in captivity conditions. For the experiment, ten fishes were selected individually and subjected to 16 different vegetables to perform a preference test. Afterwards, they were monitored with the aid of a camcorder to record the feeding behavior. At the end of the experiment, they were submitted to nonparametric test Kruskal Wallis with...
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The study was carried out between September 2011 and August 2013, using 328 Clarias gariepinus in Oba reservoir, Oyo State, Nigeria. Standard methods were used to determine gonado-somatic index (GSI), fecundity values, and enteroparasitic infestation of the fish. Sex ratio was 1.3:1, male to female, and females on an average invested 20.54 % of its body weight in egg production while male GSI was 6.05 ± 0.19 %. Spawning...
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The ability of fish feed to maintain its nutritional content for considerable period of time in pond water has become an important aspect of Aquaculture. Several feed binder, mostly starch with other ingredient capable of creating air trap within the pellet of formulated feed has been used to improve the integrity of fish feed in water. The presence of the above characteristics in cassava flour and brewer yeast inform...
Effects of Processing Methods on Anti-Nutrient Levels of Ricinus communis L.
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The anti-nutritional values in raw, autoclaved, boiled, fermented, soaked and toasted castor oil seeds (Ricinus communis L.) collected from Ado-Ekiti metropolis, Nigeria were evaluated. The time allotted for each of the treatments include, 20, 30 and 40 min (CSCA20, CSCA30 and CSCA40) for autoclaving; 40, 50 and 60 min (CSCB40, CSCB50 and CSCB60) for boiling; 48, 72 and 96 h (CSCF48, CSCF72 and CSCF96) for fermenting; 48,...
Growth determination of selected fish species in lake Alau, Borno State, Nigeria
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Growth determination of selected fish species (Oreochromis niloticus, Coptodon zillii, Brycinus nurse and Mormyrus rume ) was carried out in Lake Alau. The aim was to find out the growth pattern of the purposely selected fish species. A total of eighty samples of the four different fish species were purchased from the commercial fisher forks in lake Alau and were carried to the fish biology...
Selected metal (Fe, Cu and Zn) levels in fish and water at Abaya and Chamo Rift Valley lakes
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Samples of fish organs and water were collected from three sampling sites of Lakes Chamo and Abaya. A procedure consuming 12 mL mixture of HNO3-H2O2 for gill, kidney, liver and 1:2.5 mL mixture of HNO3-HCl for water samples for digestion of was developed. Concentrations of three metals in water and their accumulation in Tilapia (Oreochromis niloticus) and Barbus (Labeobarbus intermedius) fish species were determined...
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Water hyacinth (Eichhprnia crassipes) is the most dangerous and worst invasive aquatic weed in the worldwide including Ethiopia, and negatively affecting millions of water resources, fisheries, transportation and social structure. Water hyacinth was introduced in the water bodies of the Rift Valley in 68years ago and currently, the weed is distributed Lake Tana, Lake Abaya, Lake Koka, Koka Dam. The wide distribution and...
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A study was conducted to test the viability of the milt of the African catfish Clarias gariepinus following extension in citrated egg yolk extender and stored in a deep freezer at -20oC. Two male brood stocks of Clarias gariepinus with average age of 14 months, average weight 1.5kg and average measurement of 41.5cm length were used. The experiment comprised of two groups via the test and control groups. The test group...
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The study aims to determine the optimum dietary protein level for growing Nile tilapia fingerlings (Oreochromis niloticus) in fertilized ponds in winter, and investigate the possibility of depending entirely on natural food enhanced by fertilization as the sole source of nutrition. The experiment consisted of four treatments, each replicated in three hapas erected in an earthen pond. Each hapa was stocked with fifty...
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Mariculture is overgrowing along with the decrease in a marine catch. It is expected to be the largest supplier of marine and fishery sectors. Improvement effort of mariculture activities will be further encouraged including efforts to optimize its other roles as conservation areas. This study is conduct in Barru waters from February 2017 to November 2018. The purpose of this study is to determine biodiversity, density,...
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Fishing is the main economic activity among the riparian communities along the shorelines of Lake Victoria. The lake is however facing heavy threat of water hyacinth infestation which impacted negatively to the ecological and socio-economic activities in Lake Victoria. The study aimed at estimating the fisherfolks’ Willingness-to-pay (WTP) for improved management of water hyacinth and to examine socio-economic...
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Heavy metals concentration in the blood and gills of Clarias gariepinus obtained from two dams (Asa and University of Ilorin), Kwara State, Nigeria was carried out to determine their level of safety for human consumption. Copper (Cu), zinc (Zn), cadmium (Cd), chromium (Cr) and lead (Pb) in blood and gill of species from the two dams were determined using Atomic Absorption Spectrophotometer (AAS). Blood and extracted gills...
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Clarias gariepinus is a major cultivable fish species in Nigeria. The method of it seedling propagation and quality of seed produced is therefore crucial. In the present study, the effect of dietary supplementation of aqueous extract of Piper guineense on the milt quality of male catfish, C. gariepinus broodstocks was investigated. 75 male C. gariepinus (mean weight ± 407.5 g) were fed with four diets supplemented with...
First report of Philometra sp. infestation in Yellow edged lyretail from Indian waters
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Studies on the groupers over a two year period showed the prevalence of nematode infestation in gonads during post monsoon months. Incidences of gonad atrophy were also noted leading to isolation of the nematode and identification upto generic level. Variola louti commonly called Yellow edged lyretail is a species contributing to the hooks and line fishery was seen to be infected with Philometroid sp. Seven gonad infecting...
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The study examined the growth performance and morphometric characteristics of a wild against a hybrid strain of Malawian Tilapia Oreochromis shiranus. The objective of the study was to compare growth rates and morphological variations between hybrid and local strain. Three strains were analysed-an F1 hybrid (O. shiranus male X Oreochromis karongae female), F1 (Local) and F1 of wild strain as a control. The fish were...
Effects on Post-harvest Infrastructure Facilities in Fisheries Sector in Tamil Nadu
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Fisheries sector plays a significant role in the Indian and Tamil Nadu economy. The fishery sector has transferred from traditional activities into commercial enterprises. The main objectives of this paper are to examine the effects on effects on post-harvest infrastructure facilities in fisheries sector in Tamil Nadu and policy analysis in the state. In the matter of development of post-harvest infrastructure showed...
Comparative studies of the performance of three genera of the family Cichlidae
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A six-month trial was conducted to study the growth performance and survival rates of three different species (Sarotherodon galilaeus, Tilapia zillii and Oreochromis niloticus), belonging to three genera (Sarotherodon, Tilapia and Oreochromis) of the family Cichlidae. Fingerlings were stocked in concrete tanks and fed with 25% crude protein feed at 5% body weight twice daily. O. niloticus attained the highest mean weight...
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Two experiments were carried out to investigate and compare growth, phosphorus availability, digestibility and serum status in juvenile Clarias gariepinus. Two groups of five isonitrogenous and isocalorific diets containing25, 50, 75, and 100 % soya bean meal (oil-extracted) and roasted soya bean meal, respectively, were formulated and supplemented with graded levels of phytase at 0. 250, 500, 750 and 1000 FTU/g. A fish...
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This study assessed the effects of solar tent drying and open sun drying on nutrient content and microbial load of Engraulicypris sardella (local name Usipa), a pelagic cyprinid endemic to Lake Malawi which supports the bulk of artisanal fishery in Malawi. Solar tent dried and open sun dried Engraulicypris sardella contained 63.77±0.12 % and 63.62±0.28 % of crude protein, 22.79± 0.20 % and 22.9± 0.24 % of fat, 6.29 ±...
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This study investigated the growth, length-weight relationships and condition factor of fish species found in Challawa gorge dam. 10 fish species belonging to 9 families were identified. These were: Bagrus bayad macropterus, Synodontis schall, Oreochromis niloticus, Pollimyrus isidori, Marcusenius senegalensis, Schilbe uranoscopus, Clarias lazera, Lates niloticus, Brycinus nurse and Auchenoglanis occidentalis. Their...
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Modelling is a process by which mathematical expression is used to describe a real quantitative situation in a system. The development of scientific understanding through quantitative expression of current knowledge of a system helps managers and planners to make tactical and strategic decisions. The study was designed to model catches for important cyprinid species (E. sardella) from Lake Malawi. The Box-Jenkins approach...
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The use of duckweed chlorella combination as a protein supplement and the subsequent effects on tilapia fish fry would be a good way of reducing production costs in intensive tank tilapia culture. Thus an investigation was staged to identify the effects of duckweed and chlorella algae as feed supplements on Nile tilapia fry growth under the green water technique. Three experimental treatments were run in two replicates for...
TO DETERMINE THE SUITABILITY OFAFRICAN CATFISH EFFLUENT AS IRRIGATION WATER SOURCE IN NIGERIA.
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The reuse of catfish effluent by irrigation can make a significant contribution to the integrated management of our water resources. The study was done to determine the suitability of African catfish (Clarias gariepinus) effluent as irrigation water source. Forty (40) samples were collected from five ponds. Physical and chemical parameters of catfish effluent samples from selected earthen ponds were determined in...
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A two months feeding trial was conducted to investigate the effect of feeding frequencies (2, 3 and 4 times/day) on growth performance, feed utilization and body composition of Oreochromis shiranus under laboratory conditions. A total of 180 Oreochromis shiranus fingerlings of 9g were stocked in 9 experimental opaque fiberglass tanks of about 150l of water each. The completely randomized design (CRD) was used in this...
Research on the current situation, problems and Countermeasures of Chinese Aquaculture Logistics
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This research aimed to analyze the characteristics of China's seafood logistics, the status quo of China's seafood logistics system and logistics organization pattern of China's seafood logistics, and to evaluate the efficiency of China's seafood logistics, and put forward suggestions.
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It has been reported that Wild L. Victoria Oreochromis niloticus have disappeared from about 40% of their historical breeding ranges. This study was conducted to determine the effect of different microhabitat types on the species distribution and yield performance around Port Bunyala Bay. Physical parameters (Temperature, Total depth and Conductivity) which contributes to the dispersal and yield performance of the species...
Preliminary Assessment of heavy metal concentration in selected fish feed ingredients
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Abstract. Dearth of information exist on the heavy metal concentration (HM) of local fish feed ingredients in Nigeria, thus preliminary investigation on the concentration of lead, cadium (toxic heavy metals), copper, zinc and chromiun(essential trace metals) present in some selected feed ingredients. The two toxic metals; lead and cadium were found in fishmeal at the concentration of 0.30mg/kg each. Cd content in soybean...
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This study was conducted to assess the potential growth promoting effect of Spirulina on Macrobrachium rosenbergii juveniles. The experimental feed crude protein level was maintained at the level of maximum 32 %. The feed was prepared by fishmeal which was replaced with Spirulina powder at 2.5 %, 5 % and 10 % level, its serve as experimental feed. Without Spirulina feed serve as a control feed. The experiment was prolonged...
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