Journal of Dalian Ocean University  2011, Vol. 26 Issue (5): 391-396 DOI: 10.3969/j.issn.1000-9957.2011.05.003 |
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| The embryonic development and habit of larvae in large icefish Protosalartx hyalocranius |
| SHI Wei-gang,XU Dong-po,LIU Kai,DUAN Jin-rong,ZHANG Min-ying
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| Freshwater Fisheries Research Center,Chinese Academy of fishery Sciences,Wuxi 214081,China |
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Abstract The embryonic development and initial feeding of larvae were observed in large icefish Protosalartx hyalocranius under a Pixera Penguin 600CL digital camera system.The fertilized eggs were hatched in 852 hours at water temperature of 4-9℃and the embryonic development was divided into 9 physiological stages,namely 30 developmental substages.The newly hatched larvae had average body length of 4.76 mm and total body length of 4.86 mm.The yolk sac was exhausted about 20 days after hatching,and the fry with body length of 5.85 mm and total body length of 6.09 mm was found to swim normally.The larvae fed on phytoplankton as weaning food in the 10-20 initial feeding days under unfed condition,and began to feed rotifers actively 20-40 days after initial feeding. Microscopic observation revealed that the shells and resting eggs of the rotifers were not digested by the larvae.
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Published: 30 December 2016
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