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《Journal of Biology》 2014-04
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Effects of four ecological factors on the growth and survival of Sepia pharaonis larvae

LE Ke-xin;JIANG Xia-min;PENG Rui-bing;LUO Jiang;TANG Feng;WANG Chun-lin;School of Marme Sciences,Ningbo University;  
The effects of temperature,salinity,food types and feeding on the growth and survival of Sepia pharaonis larvae were studied to determine the optimum ecological conditions,so as to provide a theoretical basis for the artificial breeding. In laboratory conditions,effect of each single factor on the larval growth and development of Sepia pharaonis was studied at different temperatures( 18,21,24,27,30 and 33 ℃),different salinity( 18,21,24,27,30 and 33),different food types( minced shrimp,Acanthomysis brevirostis,Artemia nauplii,copepods,dead Acanthomysis brevirostis,shrimp mince + strong Artemia nauplii and strong Artemia nauplii),and different baits quantity of live Acanthomysis brevirostis( 0,2,4,6,8 and 10 g /d). The results showed that effects of temperature on larval growth of Sepia pharaonis was significant different( P 0. 05) and the most suitable temperature was 24- 27 ℃,At this temperature,the survival rate was from 84. 4% to 91. 1%,and the specific growth rate was from 4. 82% to 6. 13%. The function between survival rate( y) and temperature( x) was y =- 0. 15x3+ 30. 637x- 447. 002( r2= 0. 923). The suitable salinity was from 24 to 33,and the most suitable salinity was 27. In the optimal salinity condition,the survival rate was( 90 ± 5. 29) %,specific growth rate was( 3. 71 ± 0. 34) %. Acanthomysis brevirostis was the best bait in the 7 food types,the survival rate was( 96. 7 ± 2. 94) %,specific growth rate was( 3. 77 ± 0. 23) %; strong Artemia nauplii was the second,the survival rate was( 95. 6 ± 2. 31) %,specific growth rate was( 2. 54 ± 0. 15) %,other groups' training effect is not ideal. Feeding Acanthomysis brevirostis,along with the increase of feeding,the survival rate increased,feed intake( y) and body weight( x) of the regression equation was y = 0. 227x- 0. 063( r2= 0. 921).
【Fund】: 国家农业成果转化项目(2009GB2CZ20415);; 宁波市科技重点项目(2011C11002)
【CateGory Index】: S917.4
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