International Journal of Fisheries and Aquatic Studies
2015, Vol. 3, Issue 1, Part B
Some aspects of the biology of dominant fishes in blue Nile River, EthiopiaAuthor(s):
Tadlo Awoke, Minwyelet Mingist, Abebe GetahunAbstract:
The reproductive biology of dominant fish species below the Tisisat Fall of Blue Nile River was studied during the wet season (September-October, 2010) and dry season (March-April, 2011) using gillnets of stretched mesh size 6, 8, 10 and 12cm, monofilaments of different mesh size, castanet and hook and line. A biotic parameters, temperature, transparency, conductivity, pH and total dissolved solid of the river were taken. A total of 857 fish specimens were collected with the two sampling seasons from all sampling sites. Out of the total catch of specimens four dominant fish species was contributed 79 %. The length weight relationship of L. intermedius, L. forskalii and M. kannume were curvilinear and the relation was statistically significant (P<0.001).The mean Fulton Condition factor of L. intermedius and M. kannume were not showed significant variation (P>0.05) in both season and sex however, L. forskalii was statically significant (P< 0.01) in seasons only. Except L. nedgia M. kannume, C. gariepinus and O. niloticus species were collected from the Blue Nile river were significant difference (𝑥2, P<0.05) from the theoretical 1:1 ratio. The relationship between absolute fecundity with FL, TW and Gonad weight of L. intermedius was linear and significant (P<0.05). In general, absolute fecundity of L. intermedius was strongly positively correlated with FL, TW and GW.Pages: 62-67 | 682 Views 6 DownloadsDownload Full Article:
How to cite this article:
Tadlo Awoke, Minwyelet Mingist, Abebe Getahun. Some aspects of the biology of dominant fishes in blue Nile River, Ethiopia. International Journal of Fisheries and Aquatic Studies. 2015; 3(1): 62-67.