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Mass rearing of juvenile whitefish in brackish water using live zooplankton

Wojciech Pelczarski
Annales Zoologici Fennici
Vol. 41, No. 1, Biology and Management of Coregonid Fishes: Proceedings of the Eighth International Symposium on the Biology and Management of Coregonid Fishes, Rovaniemi, Finland, 26—29 August 2002 (2004), pp. 165-170
Stable URL: http://www.jstor.org/stable/23736199
Page Count: 6
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Mass rearing of juvenile whitefish in brackish water using live zooplankton
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Abstract

The reintroduction of whitefish of Pomeranian Bay origin to Puck Bay (southern Baltic) has been underway since 1993. Stocking has been conducted with juveniles weighing 1—2 g. In 2002, a program was initiated to rear whitefish fry in a manmade brackish water pond located at a sewage treatment plant close to the sea. The fish were fed live zooplankton which was filtered from purified wastewater. Until the current program, this zooplankton was not utilized. The mean weight of the 30 000 fry at the start of rearing on 26 June was 1.2 g. The final mean weight was 21.2 g on 22 October when over 3200 fish were released into Puck Bay as a supplement to the stocking program. The mean growth rate obtained by the fish was 0.82 mm day-1, but the survival rate was only 11% due to heavy losses in July caused by the sudden deterioration of water conditions in the pond.

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