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Flounder ( Platichthys flesus ) in salmonid freshwater tank and cage culture

Flounder ( Platichthys flesus ) in salmonid freshwater tank and cage culture Summary Fish farming activities result often in considerable high organic loadings to the water masses and sediments near the fishfarm. This study was carried out to evaluate the potential of flounder as food spillage feeder in salmonid freshwater culture. When transferring to fresh water, a clear tendency of an obligate need for food was discovered. Sufficient and continuous amounts of food are absolutely necessary for survival also when the flounder has been adapted for freshwater as long as 15 months. Flounder both in cages and in trays seemed to have little or no problem feeding on the bottom deposits (food and remnants of salmon) naturally occurring in salmon smolt production units. A high feeding rate in 0+ flounder preying on different cladoceran species was observed in addition to no significant size electivity. When feeding 0+ flounder and salmon in duoculture with small amounts of zooplankton, a competition effect resulting in growth inhibition in salmon was observed. Fairly good growth rates in flounder were observed in mixed culture experiments, but the flounder showed high individual variation. Fine meshed bottom net in the pen is necessary to retain enough food spillage to assure a positive growth rate in the flounder. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Applied Ichthyology Wiley

Flounder ( Platichthys flesus ) in salmonid freshwater tank and cage culture

Holm, J. C.; Thorsen, J.
Journal of Applied Ichthyology , Volume 2 (2) – Apr 1, 1986
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References (22)

Publisher
Wiley
Copyright
Copyright © 1986 Wiley Subscription Services, Inc., A Wiley Company
ISSN
0175-8659
eISSN
1439-0426
DOI
10.1111/j.1439-0426.1986.tb00429.x
Publisher site
See Article on Publisher Site

Abstract

Summary Fish farming activities result often in considerable high organic loadings to the water masses and sediments near the fishfarm. This study was carried out to evaluate the potential of flounder as food spillage feeder in salmonid freshwater culture. When transferring to fresh water, a clear tendency of an obligate need for food was discovered. Sufficient and continuous amounts of food are absolutely necessary for survival also when the flounder has been adapted for freshwater as long as 15 months. Flounder both in cages and in trays seemed to have little or no problem feeding on the bottom deposits (food and remnants of salmon) naturally occurring in salmon smolt production units. A high feeding rate in 0+ flounder preying on different cladoceran species was observed in addition to no significant size electivity. When feeding 0+ flounder and salmon in duoculture with small amounts of zooplankton, a competition effect resulting in growth inhibition in salmon was observed. Fairly good growth rates in flounder were observed in mixed culture experiments, but the flounder showed high individual variation. Fine meshed bottom net in the pen is necessary to retain enough food spillage to assure a positive growth rate in the flounder.

Journal

Journal of Applied Ichthyology – Wiley

Published: Apr 1, 1986

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