Farmers’ perceptions of climate change and its implication on livestock production in mixed-farming system areas of Bale highlands, Southeast Ethiopia; Challenges and extents of Soil and Water Conservation measures in Guba-Lafto Woreda of North Wollo, Ethiopia; Evaluation of milk production performance of lactating Fogera cows fed with urea and effective micro-organisms treated rice straw as basal diet.

E3 Journal of Agricultural Research and Development

E3 Journal of Agricultural Research and Development Vol. 2 (4) pp. 092-095, November 2012; © E3 Journals; ISSN 2276-9897

Stock assessment of shrimps and prawn species of the lower Benue and Niger river, Nigeria

R.G Okayi1 * , G.A. Ataguba1 , F.U. Mbata1
1 Department of Fisheries and Aquaculture university of Agriculture, P.M.B. 2373, Makurdi, Nigeria
*Corresponding Author E-mail: rgokayi@yahoo.com, Tel: +2348054482199, +2348068078099
Accepted 26 April 2012

Abstract

The shrimps were collected from three sampling sites: on the River Benue at Makurdi, Benue state, on the River Niger at Jebba and Lokoja at Kogi state from January to April, 2011. Macrobrachium felicinum and Atya gabonensis were sampled during this period, with A. gabonensis occurring more abundantly. Condition factors of freshwater shrimps A. gabonensis from the two water bodies in Nigeria range from 1.875 for species in Jebba in March to 3.330 for Lokoja in March. The parameter “b” of the length – weight relationship of the fresh water shrimps are less than three (ranging from 1.0233 for species from Lokoja in April to 2.7717 for species from Makurdi in Feburary). These values suggest negative allometric growth. The length frequency of freshwater shrimps sampled shows that peak populations of length groups occurred in April for species from Jebba and Makurdi while peaks occurred in January for species from Lokoja. Peak frequencies were observed in length of 4.0 – 5.4 cm and 8.5 – 9.9 cm in January as well as 5.5 - 6.9 cm for species from Lokoja and in the group of 5.5 – 6.9 cm in April for species from Makurdi and 7.0 – 8.4 cm in April for both Makurdi and Jebba.

Keywords: Key words: Stock assessment, Shrimps and River Benue and Niger, Nigeria

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