Early development and the point of no return in pikeperch( Sander lucioperca L.) larvae  

作　　者：许郑超 李彩娟 凌去非 GAUGHAN Sarah 王国成 韩晓飞 

机构地区：[1]School of Biology and Basic Medical Sciences, Soochow University [2]Department of Biology & School of Interdisciplinary Informatics, University of Nebraska at Omaha

出　　处：《Chinese Journal of Oceanology and Limnology》2017年第6期1493-1500,共8页中国海洋湖沼学报（英文版）

基　　金：Supported by the Science Fund of Jiangsu Province(No.BY2015039-10);the Fund of Jiangsu Province Collaborative Center of Regional Modern Agriculture&Environmental Protection(No.HSXT219);the Science Fund of Changshu Science and Technology Bureau,China(No.CN201408)

摘　　要：The objectives of the present study were to evaluate the yolk-sac and oil globule absorption and point of no return （PNR） ofpikeperch （Sander lucioperca L.） larvae. Artificial propagation ofpikeperch was performed at （15±2）℃. Yolk-sac absorption, oil globule absorption, larval growth and the first initial feeding rate were observed to analyze the early growth and to determine the PNR of pikeperch larvae. The total length of newly hatched （0 day after hatching, DAH） pikeperch larvae was （4.25±0.22） mm and the volume of the yolk-sac and the oil globule was （0.30±0.12）mm^3 and （5.14±2.28） 10-2 mm^3 respectively. The yolk-sac and the oil globule were exhausted at 11 DAH and 14 DAH, respectively. Pikeperch larvae began feeding at 8 DAH with an initial feeding rate about 10.0%. From 9 to 14 DAH, the initial feeding rate increased rapidly, and reached its highest （about 82.7%） at 14 DAH. It declined thereafter, 48.9% at 15 DAH and 35.6% at 16 DAH, thus the pikeperch larvae reached PNR by 15-16 DAH. The appropriate first feeding time for the pikeperch larvae is 11-12 DAH, when the initial feeding rate is higher than half of the maximum initial feeding rate.The objectives of the present study were to evaluate the yolk-sac and oil globule absorption and point of no return(PNR) of pikeperch(S ander lucioperca L.) larvae. Artificial propagation of pikeperch was performed at(15±2)°C. Yolk-sac absorption, oil globule absorption, larval growth and the first initial feeding rate were observed to analyze the early growth and to determine the PNR of pikeperch larvae. The total length of newly hatched(0 day after hatching, DAH) pikeperch larvae was(4.25±0.22) mm and the volume of the yolk-sac and the oil globule was(0.30±0.12) mm3 and(5.14±2.28) 10-2 mm 3 respectively. The yolk-sac and the oil globule were exhausted at 11 DAH and 14 DAH, respectively. Pikeperch larvae began feeding at 8 DAH with an initial feeding rate about 10.0%. From 9 to 14 DAH, the initial feeding rate increased rapidly, and reached its highest(about 82.7%) at 14 DAH. It declined thereafter, 48.9% at 15 DAH and 35.6% at 16 DAH, thus the pikeperch larvae reached PNR by 15–16 DAH. The appropriate first feeding time for the pikeperch larvae is 11–12 DAH, when the initial feeding rate is higher than half of the maximum initial feeding rate.

关 键 词：growth initial feeding rate pikeperch （Sander lucioperca） larvae Point of No Return 

分 类 号：S917.4[农业科学—水产科学]