Open Access Original Research Article

Comparative Studies of Spawning Potentials in Female African Bonytongue Heterotis niloticus (Curvier 1829) between Cross River and Great Kwa River, Nigeria

Ikot, Ndueso Udoudo

Asian Journal of Fisheries and Aquatic Research, Page 1-7
DOI: 10.9734/ajfar/2018/v1i3306

The spawning potentials of Heterotis niloticus from Great Kwa River and Cross River was compared in a twelve-month study. Forty-nine female H. niloticus was sampled from Cross River and thirty four from Great Kwa River from January to December 2014.  Gonadosomatic index (GSI), fecundity and histological examinations were investigated in the Institute of Oceanography laboratory. Each month of this study recorded at least one female specimen with eggs at different stages of development. In Cross River, the months of August and September recorded one hundred per cent female with eggs, while Great Kwa River exhibited such performance in July, an indication of spawning activities by the fish. Cross River had a major GSI peak in July with a minor one in August, but Great Kwa River did not exhibit any significant GSI peak throughout the study, and no significant difference in GSI between the rivers when compared with T-test (0.22; P>0.05). There was a significant difference (0.02, P<0.05) in fecundity of H. niloticus between the population in Cross River and Great Kwa River. Regression analysis of fecundity and body weight showed a positive correlation (P<0.05)(r=0.3686). Histological changes in the gonad of the fish showed no disparity between the rivers. H. niloticus has the ability to spawn all year round, but in the Cross River, the fish has high reproductive potentials than those in the Great Kwa River.

Open Access Original Research Article

Technical Efficiency of White Leg Shrimp Production Using Data Envelopment Analysis (DEA), Case Study: Jiangsu Province, China

Mamoud Mansaray, Agbekpornu Hayford, Zhang Zongli, Zhu Weifan, Yuan Xinhua

Asian Journal of Fisheries and Aquatic Research, Page 1-9
DOI: 10.9734/ajfar/2018/v1i3309

Production of white leg shrimp (Penaeus vannamei) is a very important economic activity in the overall farming system in China. In spite of the present successes witnessed by white leg shrimp farming, there are many challenges (disease, overfeeding, effluent discharge, lack of technical knowledge, low educational level, inexperienced managers, the high cost of production among others) continuing to set back the growth of this sector in China. The study was conducted in Jiangsu province because is one of the leading producing provinces of White-leg shrimp (Penaeus vannamei) in China. The research examines the technical efficiency level of white leg shrimp production in Jiangsu Province, China. Three seasonal crops data in 2016 crop year were collected from 52 white leg shrimp farmers in the study area. All data were coded in Excel 2007 spreadsheet package and analysed with SPSS version 20 and DEAP version 2.1 software at 95% confidence level. Descriptive statistical, regression and Data Envelopment Analyses (DEA) were used to analyse the data. Results revealed an average technical efficiency score of 83.1%, under a constant return to scale. Majority of the farmers (62%) were technically inefficient in utilising input resources with technical efficiency score less than 1. Twenty farmers were technically efficient with technical efficiency (TE) score equal to 1. Feed, fingerlings and chemical showed significant negative influence on technical efficiency at 5% level of significance while labor, fixed cost and age exhibited strong negative impact at 1% level of significance.

Open Access Original Research Article

Factors Affecting Macrobenthic Invertebrates Distribution in Badagry Creek, South Western Nigeria

O. A. Olapoju, C. A. Edokpayi

Asian Journal of Fisheries and Aquatic Research, Page 1-11
DOI: 10.9734/ajfar/2018/v1i3315

The aim of the paper is to identify macroinvertebrates distribution in response to induced stressors and physico-chemical parameters of water and sediment. The species composition of macrobenthic invertebrates as well as the physico-chemical characteristics of Badagry creek was investigated monthly. Six sampling stations selected based on different levels of human activities along the creeks stretch and samples were collected monthly from September 2006 to February 2007. The fluctuations of some of the physical and chemical parameters such as pH, dissolved oxygen, BOD and total organic carbon appeared to have been influenced by activities along the study stretch. Analysis of variance (ANOVA)  for all parameters showed no significant differences (P > 0.05) in the parameters but  Post hoc tests analysis using Duncan showed that there was a significant difference (P = 0.05) in the mean total of some of the parameters. pH, clay, sand and gravel were significantly correlated with other parameters while canonical correspondence analysis (CCA) model showed that the environmental variables correlated with significant part of the variations in the individual species abundance and it revealed that dominant species were found to be significantly correlated with dissolved oxygen, total dissolved solids, sand and pH.

Open Access Original Research Article

Food and Feeding Habits of Black Spot Cat Fish (Auchenoglanis biscutatus) from Lower River Benue, Makurdi

Edem, Edem Thomas, Patience B. Opeh

Asian Journal of Fisheries and Aquatic Research, Page 1-5
DOI: 10.9734/ajfar/2018/v1i3321

The present study is aimed to provide information on the food and feeding habit of adult Auchenoglanis biscutatus in Lower River Benue. The natural food of A. biscutatus in the Lower River Benue was studied from stomach contents of the fish. The stomach contents were analyzed using two methods; the frequency of occurrence and point methods. A total of 100 stomachs were randomly examined. Eleven major items constituted the diet of A. biscutatus. The stomach content analysis of A. biscutatus have shown that they fed on the various food items ranging from plant parts, detritus, seeds, digested food particles, fish parts, mollusc, sand/mud, insect parts and algae. This indicates that A. biscutatus is an omnivorous bottom feeder since; bottom dwelling immature insects dominated most of the food items of animal origin, digested food and detritus. A. biscutatus in Lower Benue River feeds on a wide range of food items which could make it to be regarded as an omnivore. Future attempts to culture this species must take cognizance of its food habits in the wild.

Open Access Original Research Article

Growth Responses of Hybrid Catfish (Clarias gariepinus ♀ X Heterobranchus bidosarlis ♂) Fingerlings Fed Diets Lablab Bean Meal (Lablab purpureus)

B. S. Aliu, S. Osayamen, A. C. Esume

Asian Journal of Fisheries and Aquatic Research, Page 1-6
DOI: 10.9734/ajfar/2018/v1i3326

This study examined the replacement of soyabean meal (SBM) with Lablab bean meal (LBM) in the practical diets of Clariid catfish (Heteroclarias). Five Iso-nitrogenous diets of 40%CP containing varying levels of LBM were incorporated as a non-conventional feedstuff at D1(10% LBM); D2(20%LBM); D3(30%LBM); D4(40%LBM) and D5(50% LBM) as a replacement for soyabean meal. Seventy-five Heteroclarias fingerlings with an initial mean weight of 1.46±0.01 g were stocked randomly to five treatments in triplicate groups and were fed to satiation twice daily for a period of 70 days. At the end of the 70days experimental period, all growth parameters decreased across all diets from D1 to D5. D1(10% LBM) had the best growth rate as it recorded the highest value in terms  of weight gain (1.25); feed intake (2.34); feed conversion ratio (1.86); relative weight gain (4.86) and specific Growth rate of (1.33) while D5 recorded the least values across all parameters. D1 was not significantly different (P>0.05) from D­2 in all growth parameters listed above but D1 and D2 were significantly different (P<0.05) from D3, D4 and D5. Therefore, Lablab bean meal can replace soyabean meal totally but will be best at 10% replacement in diets for Hetero clarias without compromising the growth and carcass composition. Further research should be carried out to test lablab meal on pure Heterobranchus bidorsalis fingerlings.