FEEDING OF LABORATORY-REARED LARVAE OF SEA BREAM ARCHOSARGUS-RHOMBOIDALIS (SPARIDAE)

被引:49
作者
STEPIEN, WP [1 ]
机构
[1] UNIV MIAMI, ROSENSTIEL SCH MARINE & ATMOSPH SCI, MIAMI, FL 33149 USA
关键词
D O I
10.1007/BF00391480
中图分类号
Q17 [水生生物学];
学科分类号
071004 ;
摘要
Feeding by larvae of the sea bream A. rhomboidalis (L.) was investigated from late Sept. 1972 to early May 1973 using laboratory-reared larvae. Fertilized eggs were collected from plankton tows in Biscayne Bay [Florida, USA] and the larvae were reared on zooplankton also collected in plankton nets. Techniques were developed to estimate feeding rate, food selection, gross growth efficiency and daily ration. Daily estimates of these were obtained through 16 days after hatching at rearing temperatures of 23, 26 and 29.degree. C. Feeding rate increased exponentially as the larvae grew and increased as temperature was raised. At 23.degree. C larvae began feeding on Day 3, at 26 and 29.degree. C larvae began feeding on Day 2. Feeding rates at initiation of feeding and on Day 16 were, respectively: 23.degree. C, 7.16 food organisms/larva per h (flh) and 53.78 flh; 26.degree. C, 7.90 flh and 168.80 flh; 29.degree. C, 17.62 flh and 142.07 flh. Sea bream larvae selected food organisms by size. At initiation of feeding they selected organisms less than 100 .mu.m in width. As larvae grew they selected larger organisms and rejected smaller ones. The major food (more than 85% of the organisms ingested) was copepod nauplii, copepodites and copepod adults. Minor food items were barnacle nauplii, tintinnids, invertebrate eggs and polychaete larvae. Mean values for gross growth efficiency of sea bream larvae ranged from 30.6% at 23.degree. C to 23.9% at 29.degree. C. Mean values for daily ration, expressed as a percentage of larval weight ranged from 84% at 23.degree. C to 151% at 29.degree. C and tended to decline as the larvae grew.
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页码:1 / 16
页数:16
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