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A study of the mechanism of algal uptake in yolk‐sac larvae of Atlantic halibut ( Hippoglossus hippoglossus )
Author(s) -
Reitan K. I.,
Bolla S.,
Olsen Y.
Publication year - 1994
Publication title -
journal of fish biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.672
H-Index - 115
eISSN - 1095-8649
pISSN - 0022-1112
DOI - 10.1111/j.1095-8649.1994.tb01207.x
Subject(s) - halibut , biology , hippoglossus hippoglossus , algae , tetraselmis , ingestion , zoology , yolk sac , larva , morone saxatilis , serranidae , fishery , ecology , fish <actinopterygii> , embryo , bass (fish) , endocrinology
The drinking rate of water, and the ingestion‐ and assimilation rates of algae in yolk‐sac larvae of Atlantic halibut were examined by use of 3 H‐dextran and 14 C‐labelled algae. The drinking rate throughout the yolk‐sac stage was in the range of 7–160 nl per larva h −1 , with a slight increase towards the end of the period. The ingestion rate of algae ( Tetraselmis sp.) was very low before day 30 and showed a peak between day 43 and 48 at 5° C. The assimilation efficiency of the algae was in the range of 1‐5%. The clearance rate of algae was 100–1000 times higher than the drinking rate, and was correlated to the distance between the gill arches. Bigger cells were more effectively retained than smaller ones. The results suggested that the larvae acted as filter feeders from day 30 up to the point when they are expected to start feeding on bigger prey.