חיפוש מתקדם
Aquaculture (source)
Barki, A., Department of Aquaculture, Institute of Animal Science, Agricultural Research Organization, P.O. Box 6, Bet Dagan 50250, Israel
Levi, T., Department of Aquaculture, Institute of Animal Science, Agricultural Research Organization, P.O. Box 6, Bet Dagan 50250, Israel
Shrem, A., Department of Aquaculture, Institute of Animal Science, Agricultural Research Organization, P.O. Box 6, Bet Dagan 50250, Israel
Karplus, I., Department of Aquaculture, Institute of Animal Science, Agricultural Research Organization, P.O. Box 6, Bet Dagan 50250, Israel
The effect of ration and spatial distribution of feed on survival, growth, and competition was studied in juvenile red-claw crayfish in the laboratory. Groups of 60 juveniles were raised for 27 days in each combination of ration and spatial distribution: feed being provided once a day or once in 4 days, spatially dispersed or clumped. Aggressive interactions among juveniles were recorded on the 12th day, both prior to and following feed administration. The final weight was much higher when the crayfish were fed once a day compared with once in 4 days, but the respective survival was lower. The latter was explained by increased cannibalism due to higher moulting frequency. The effect of spatial distribution of feed on growth and survival was marginal. However, this factor affected competition for feed. This was revealed by the sharp increase in frequency of aggressive interactions following feed insertion, observed only in the groups where the feed was clumped. Ration bad no influence on competition. The weak association between feed competition and both survival and growth is discussed.
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הספר "אוצר וולקני"
אודות
תנאי שימוש
Ration and spatial distribution of feed affect survival, growth, and competition in juvenile red-claw crayfish, Cherax quadricarinatus, reared in the laboratory
148
Barki, A., Department of Aquaculture, Institute of Animal Science, Agricultural Research Organization, P.O. Box 6, Bet Dagan 50250, Israel
Levi, T., Department of Aquaculture, Institute of Animal Science, Agricultural Research Organization, P.O. Box 6, Bet Dagan 50250, Israel
Shrem, A., Department of Aquaculture, Institute of Animal Science, Agricultural Research Organization, P.O. Box 6, Bet Dagan 50250, Israel
Karplus, I., Department of Aquaculture, Institute of Animal Science, Agricultural Research Organization, P.O. Box 6, Bet Dagan 50250, Israel
Ration and spatial distribution of feed affect survival, growth, and competition in juvenile red-claw crayfish, Cherax quadricarinatus, reared in the laboratory
The effect of ration and spatial distribution of feed on survival, growth, and competition was studied in juvenile red-claw crayfish in the laboratory. Groups of 60 juveniles were raised for 27 days in each combination of ration and spatial distribution: feed being provided once a day or once in 4 days, spatially dispersed or clumped. Aggressive interactions among juveniles were recorded on the 12th day, both prior to and following feed administration. The final weight was much higher when the crayfish were fed once a day compared with once in 4 days, but the respective survival was lower. The latter was explained by increased cannibalism due to higher moulting frequency. The effect of spatial distribution of feed on growth and survival was marginal. However, this factor affected competition for feed. This was revealed by the sharp increase in frequency of aggressive interactions following feed insertion, observed only in the groups where the feed was clumped. Ration bad no influence on competition. The weak association between feed competition and both survival and growth is discussed.
Scientific Publication
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