Effect of increased water recirculation rate on algal supply and post-larval performance of scallop (Pecten maximus) reared in a partial open and continuous feeding system

被引:7
|
作者
Christophersen, Gyda
Torkildsen, Lise
van der Meeren, Terje
机构
[1] Univ Bergen, Dept Biol, N-5020 Bergen, Norway
[2] Inst Marine Res, Dept Aquaculture, N-5817 Bergen, Norway
[3] Inst Marine Res, Austevoll Aquaculture Res Stn, N-5392 Storebo, Norway
关键词
algal supply; chemical content; growth; pecten maximus; post-larvae; scallop; survival; water recirculation;
D O I
10.1016/j.aquaeng.2006.03.005
中图分类号
S2 [农业工程];
学科分类号
0828 ;
摘要
In a commercial scallop hatchery spat production depends on a culture system which ensures high survival and good growth. Reuse of water with algae may increase the food exploitation and hence reduce the costs. Post-larvae of great scallop (Pecten maximus) were studied in a commercial hatchery using a partial open and continuous feeding tank system. Three different water recirculation rates (67, 83 and 92%) were tried out in two experiments with post-larvae originating from three spawning groups of ages between 43 and 57 days post-spawn, 316-886 mu m shell-height and 1.1-9.6 mu g ash-free dry weight. The post-larvae were held in sieves in tanks of 2500 1 where a downwelling flow was maintained by airlifts. New water with a mix of monocultured algae was continuously added to the tanks at algal concentrations of 10 and 15 cells mu l(-1) in experiment 1 (groups 1 and 2) and 2 (group 3), respectively. The algal supply to each sieve was reduced along with increased recirculation rate, but was kept between 6 and 13 cells mu l(-1). Generally no significant differences in survival, growth or chemical content were found between the three recirculation rates, while few differences were found between and within groups. Large variation in survival was found between and within groups (1-81%). Highest survival was found in experiment 1, and where post-larvae from two settlements were used, the first settlement survived better than the second. The daily growth ranged from 15 to 62 mu m shell-height and from 0.3 to 2.6 mu g ash-free dry weight. The scallop post-larvae could well be reared at all three recirculation rates studied as an increase from 67 to 92% did not seem to affect the post-larval performance seriously. The algal supply, however, had to be compensated by an increasing number of cells (> 10 cells mu l(-1)) when increasing the recirculation rate. (c) 2006 Elsevier B.V. All rights reserved.
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页码:271 / 282
页数:12
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