Growth and survival studies on 0-group plaice (Pleuronectes platessa L.) in a small basin with a closed ecosystem
Research report
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http://hdl.handle.net/11250/114448Utgivelsesdato
1978Metadata
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A growth and survival experiment on 0-group plaice was carried out in a small
basin during the summer of 1976. The volume of the basin was about 25 m³, and the
seawater was left stagnant during the summer. Of the initial 200 metamorphosed fry
released, 154 survived, and a mean daily length increment of 0.28 mm was observed
for a period of 105 days. The temperature was about 20°C for half of the experimental
period.
The main energy flow is supposed to have followed this simplified route: phytoplankton
-> Mytilus edulis produced faeces -> detritus-eating crustaceae -> plaice fry.
Calculations of food intake and gross growth efficiency have been carried out, applying
the metabolic values earlier reported (EDWARDS, FINLAYSON and STEELE 1969), and
the present data have been compared with their results. The basin appeared to be an
ecosystem with a high production, giving better survival and growth than previous
tank experiments.
In spite of the extreme temperature during midsummer, the growth was comparable
to that observed under natural conditions (Loch Ewe), but the survival was far better
due to lack of predators in the basin.
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Fiskeridirektoratets skrifter, Serie Havundersøkelservol 16 no 13