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Growth and survival of cuttlefish (Sepia officinalis) of different ages fed crustaceans and fish. Effects of frozen and live prey Pedro Dominguesa, , , Ant?nio Sykesa, Anne Sommerfieldb, Eduardo Almansac, Ant?nio Lorenzoc and Jos? P. Andradea
Received 2 January 2003; revised 8 April 2003; accepted 11 April 2003. ; Available online 29 May 2003.
Abstract
Effect of enriched natural diet on survival and growth of juvenile cuttlefish Sepia officinalis L.N. Kouetaa, , , E. Boucaud-Camoua and B. Noelb
Received 11 December 2000; revised 20 March 2001; accepted 21 March 2001. Available online 10 December 2001
Abstract
Received 2 January 2003; revised 8 April 2003; accepted 11 April 2003. ; Available online 29 May 2003.
Abstract
Three feeding experiments, using live mysid shrimp, grass shrimp or fish fry as prey for 1-, 30- and 60-day-old cuttlefish were conducted to determine the efficiency of each dietary source in relation to cuttlefish size and age. Additionally, a fourth experiment using fish fry and grass shrimp, but previously frozen, was also conducted. The results showed that when 1-day-old cuttlefish were fed mysids, grass shrimp or fish for 4 weeks, mysids were the best prey, but only during the first week. From this moment until the end of the experiment, the best growth rate was when cuttlefish were fed grass shrimp. Cuttlefish fed fish fry showed the poorest growth rate throughout the experiment. Similarly, cuttlefish aged 30 or 60 days fed grass shrimp or fish fry had the best growth rates when fed grass shrimp. When cuttlefish were fed live fish, survival increased with size of cuttlefish (73.3%, 91.7% and 100% for 1, 30 and 60 days cuttlefish, respectively). In the fourth experiment, using frozen diets, overall acceptance of each diet (feeding rates) was the same for fish and shrimp. However, lower growth was obtained when cuttlefish were fed fish compared to grass shrimp. This lower growth was due to a lower food conversion (28% vs. 41%). Since cephalopod paralarvae and juvenile most likely need prey rich in polyunsaturated fatty acids (PUFA), phospholipids and cholesterol, and a moderate content in neutral lipids, we have analyzed the biochemical compositions of the different prey to evaluate the influence of this factor on growth and survival.
Effect of enriched natural diet on survival and growth of juvenile cuttlefish Sepia officinalis L.N. Kouetaa, , , E. Boucaud-Camoua and B. Noelb
Received 11 December 2000; revised 20 March 2001; accepted 21 March 2001. Available online 10 December 2001
Abstract
Juvenile cuttlefish hatched in the laboratory were reared for 30 days with different enriched diets, in spring and in summer. The groups fed an enriched natural diet exhibited a high rate of survival even when seawater quality decreased during the summer. The natural diet enriched in polyunsaturated fatty acids (PUFA) induced faster growth in juvenile cuttlefish; the stimulating effect of PUFA on growth was evident during the very early juvenile stage, and the benefit resulted is conserved during further growth. The maximum daily ration was lower in groups fed with the enriched diet than in the control.
These data indicate the importance of n?3 PUFA such as docosahexaenoic acid (DHA; 22:6n?3) and eicosapentaenoic acid (EPA; 20:5n?3) in cephalopod juvenile nutrition.