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Comparative Study of the Growth and Gonad Development of Clarias gariepinus （Burchell 1822） Fed Diets with Plant and Animal-based Ingredients in Concrete Tanks

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Journal of Agricultural Science and Technology(A) 2012年第10期2卷 1203-1210页

作者： Albert Philip Ekanem Sunday Urom Eteng francis maduwuba nwosu Victor Oscar Eyo Institute of Oceanography University of Calabar PMB 111 5 Calabar Nigeria Department of Zoology and Environmental Biology University of Calabar PMB 1115 Calabar Nigeria

A twelve week experiment was conducted to compare the effects of diets with plant-based and animal-based ingredients on growth and gonad development of Clarias gariepinus. One hundred and 12 sub-adult C. gariepinus with an average weight of 205 ×5.09 g, were stocked in six concrete tanks （9 × 4 × 2 m3） containing 20 fish each. Experiment had 3 replicates and animals fed daily at 5% body weights. There was no significant difference （P 〈 0.05） in proximate compositions of the two experimental feeds and controls. Fecundity, gonad weight and gonasomatic index were higher in fish fed diet 13 than A and C. Similarly, growth indices were higher in fish fed diet B than in A and C. Histology of gonads showed a faster development of oocytes of eggs in fish fed animal-based ingredients than plant-based and combined plant and animal diets. Although there were slight differences in growth parameters and gonad development in favor of feed with animal-based ingredients, plant-based feed compared favorably in the growth and gonad development of C. gariepinus. Plant-based ingredients are recommended on the basis of affordability and availability as substitute for animal-based ingredients in C. gariepinus feed.

关键词： Plant-based animal-based diets growth gonad development Clarias gariepinus.

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Species Composition and Gear Characteristics of the Macrobrachium Fishery of the Cross River Estuary,Nigeria

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Journal of Ocean University of China 2010年第1期9卷 71-75页

作者： francis M.nwosu Institute of Oceanography University of CalabarPMB 1115CalabarNigeria Geospatial Analytics Laboratory 103 PNM BuildingUniversity of South FloridaSt.Petersburg140 Seventh Ave South St.PetersburgFL 33701USA

The Cross River Estuary,Nigeria,is an important shrimping area for artisanal fishermen of the coastal *** multi-species Macrobrachium fishery is exploited with three main gears,namely beach seine,push net and *** on species composition of this fishery recorded thirteen shrimp species,one swimming crab (Callinectes amnicola) and two fish species (Eleotris *** Pellonula leonensis).The shrimp species identified included Macrobrachium macrobrachion (83.39% and 55.69% by number and weight,respectively),*** (9.66% and 37.18%),*** (3.8% and 2.87%),juveniles-sub-adults of Penaeus notialis (1.11% and 1.3%),***,***,Palaemonetes africanus,Palaemon maculatus,Palaemon elegans,Desmocaris sp.,Leander sp.,Nematopalaemon hastatus and Alpheus *** the selectivity index for trap was 0.25,beach seine and push net had a lower index of *** results present the first comprehensive and representative report for the Estuary shrimp fishery and will assist in the management of the biodiversity of this ecosystem.

关键词： species composition gear characteristics Macrobrachium fishery Cross River Estuary, Nigeria

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