Growth of juvenile tilapia, Oreochromis niloticus L. from Lakes Zwai, Langeno and Chamo (Ethiopian rift valley) based on otolith microincrement analysis

Publication Type:Journal Article
Year of Publication:2000
Authors:D. Admassu, Ahlgren I.
Journal:Ecology of Freshwater Fish
Date Published:SEP
Accession Number:ISI:000088989900001
Keywords:chinook salmon, ethiopia, fish otoliths, flounder, GROWTH, increments, juvenile oreochromis niloticus, larval, microstructure, mortality, otolith microincrements, patterns, rift valley lakes, SIZE

Age and growth of juvenile tilapia, Oreochromis niloticus, from Lakes Zwai, Langeno and Chamo (Ethiopia) were studied from microincrements in otoliths. Growth in length was best described by the Gompertz model. Average growth rate of the fish was most rapid in Lake Chamo (0.39 mm . day(-1), 1.14% . day(-1)), intermediate in Lake Zwai (0.20 mm . day(-1), 0.72% . day(-1)) and slowest in Lake Langeno (0.16 mm . day(-1), 0.62% . day(-1)). Similarly, back-calculation from otolith increment widths gave growth rates of 0.28 to 0.43 mm . day(-1), 0.15 to 0.32 mm . day(-1) and 0.11 to 0.28 mm . day(-1) for Chamo, Zwai and Langeno fish, respectively. In addition, Fulton's condition factor was largest for Chamo tilapia and smallest for Langeno tilapia; the difference between fish from Langeno and Zwai was small. Rapid growth of juvenile O. niloticus in Lake Chamo was attributed to warm temperature and better food quality.

Alternate Journal:Ecol Freshw Fish

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