The Diversity, Relative Abundance and Some Aspects of the Biology of Fish Species in Lake Abaya, Ethiopia

Kebede, Berhanu

dc.contributor.advisor	Getahun, Abebe(PhD)
dc.contributor.author	Kebede, Berhanu
dc.date.accessioned	2018-06-29T06:22:47Z
dc.date.available	2018-06-29T06:22:47Z
dc.date.issued	2016-07
dc.identifier.uri	http://etd.aau.edu.et/handle/123456789/4806
dc.description.abstract	The diversity, relative abundance and some aspects of the biology of fish species in Lake Abaya were studiedfi'om August to September 2015. One thousand forty three (1043) fish speciemns were collected using gil/nets of 6, 8, 10, 12 and 14 cm stretched mesh sizes, having a length of 100 m and a depth of2 m. Fishfauna harvestedji'om Algae (123), Bayiso (151), Shigima (222), Guji (410) and Gidabo (137) were identified based on their morphometric and meristics characters following the key developed for Ethiopian fish fauna. Out of the total catch S. schall were the most abundant fish at all the sampling sites in the lake, with Bayiso site having the highest abundance of 58.2% followed by Guji (56.3%), Shigima (44.6%) and the least was Gidabo (31.4%). The diversity index was higher at the Gidabo (I. 71) follolYing Algae, GlIji, Bayiso and Shigima lYith the IRI value of 1.6, 1.44, 1.17 and 1.15, respectively. S. schalllYas the most important fish species at Algae, Guji and Bayiso with IRl values of 42.88%, 60.54% and 53.57%, respectively. Length-lYeight relationship of the dominant species; S. schall (b=2.56), L. bynni (b=3.1), C. gariepinus (b=2.43), and O. niloticus (b=2.59) lYas curvilinear and significant (P<0.05). The coefficient lYas very close to 3 for L. bynni suggesting isometric growth pattern. Fulton condition factor (FCF) is 1.12 for S. schall, 1.01 for L. bynni, 0.63 for C. gariepinus and 1.43 for 0. niloticus. More males than females were caught only for M caschive and for S. intermedius. HOlYever, except for L. bynni and S. schall, sex ratio lYas not significantly different IX', p>O. 05) ji'O/ll the theoretical 1: 1 ratio for the other ~pecies. Estimated fecundity was curvilinearly related with totallengh and linearly related to totallYeight and gonad weight. Lake Abaya is rich in fish biodiversity, in terms of total number of fish caught and number of species recorded In order to have a beller knowledge of the fish population in the area further studies are required on the diversity, abundance and biology of the fishes. Key Words: Biology, Fish diversity, Lake Abaya, Relative abundance	en_US
dc.language.iso	en	en_US
dc.publisher	Addis Ababa University	en_US
dc.subject	Biology	en_US
dc.subject	Fish Diversity	en_US
dc.subject	Lake Abaya	en_US
dc.subject	Relative Abundance	en_US
dc.title	The Diversity, Relative Abundance and Some Aspects of the Biology of Fish Species in Lake Abaya, Ethiopia	en_US
dc.type	Thesis	en_US