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| Breeding of Agamaki Clam Sinonovacula constricta in Flowing Water |
| LI Lianxing,LI Hao,SHEN Heding,DU Wenjun |
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Abstract In order to explore influence of water condition and different water‐change operations on initial breeding stage of Agamaki clam Sinonov acula constricta , relevant tests were implemented in Sanmen Donghang aquaculture farms in September 2015 .Mesh cloth and water inlet and outlet switch were set in test barrel X(Number :1 ,2 ,3* ,4* ,5* ,6* ) for flowing velocity control ,and the comparative test barrels Y (Number :7 ,8) were not set with mesh cloth and pool water‐change operation ,at water temperature of 26—27 .5 ℃ ,pH 8 .0—8 .2 ,salinity 13 ,and illuminance of less than 1000 lx .The results showed that for non‐flowing breeding ,increasing water‐change amount and the setting of mesh cloth to reduce mechanical damage led to significant increase in survival rate of Agamaki clam larvae ,and did not lead to significant effect on hatching and growth or metamorphosis .For flowing breeding ,when water‐change amount was gradually increased ,fertility rate of Agamaki clam eggs was to some extent decreased hatching rate of fer‐tilized ovum decreased after certain increase ,significant difference in D‐type larva size and juveniles .The clam had poor grow th and low survival in the middle and late periods of test ,compared with shell length and survival rate data in non‐flow barrels .When the flowing rate was decreased ,there was no significant difference in shell length ,with significant increase in survival rate .The findings indicate that the proper a‐mount of flow water breeding and no pool water‐change operation can significantly improve the larva hatch ,metamorphosis rate ,survival rate ,without significant effect on the time of metamorphosis and ju‐venile size .
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Received: 25 May 2016
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