Abstract:
Some biological aspect of spawning migratory Labeobarbus species in small tributary rivers of Lake
Tajjna (Qimon, Guanta, Shini and Chibirna) Rivers were studied starting from August 2013 to December
2013. Fish were collected bimonthly using 6 and 8 cm monofilament gillnets and 6, 8, 10 and 12 cm
mesh size poly filament gillnets. A total of 933 adult Labeobarbus specimens were collected within five
sampling months at all sampling rivers. Descriptive statistics was used to present the data. One way
ANOVA was used to analyze the Fulton condition factor of fishes. Length–weight relationship of the
dominant Labeobarbus species (L. intermedius, L. brevicephalus and L. nedgia) showed statistically
significant curvilinear relationships. Fulton condition factor for L. brevicephalus showed significant
difference among four rivers (P<0.05) and L. intermedius showed non-significant difference. Fulton’s
condition factor of L. intermedius showed significant difference between sexes (P<0.001) and time of
spawning (P<0.01). The present findings showed that the unique Lake Tana Labeobarbus species flock
reproductive and productive performance were determined by development activities that are taken from
each tributary rivers and streams like sand mining and irrigation activities. Finally this crucial problem
should be taken appropriate mitigation measures in order to create sustainable development.
