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| Effect of geographic origin, temperature and timing of broodstock collection on conditioning, spawning success and larval viability of Ruditapes decussatus (Linné, 1758) |  |
| Matias, M.; Joaquim, S.; Leitão, A.; Massapina, C. (2009). Effect of geographic origin, temperature and timing of broodstock collection on conditioning, spawning success and larval viability of Ruditapes decussatus (Linné, 1758) Aquacult. Int. 17(3): 257-271 |
| In: Aquaculture International. Chapman & Hall/Kluwer/Springer: London. ISSN 0967-6120, meer |
| Trefwoorden |
Artificial spawning; Bivalves; Conditioning; Induced breeding; Kuit schieten, Paaien; Ruditapes decussatus [WoRMS]; Marien |
| Abstract |
Culture of Ruditapes decussatus is clearly limited by the availability of seed, as
this production proceeds almost exclusively from natural recruitment. Artificial spawning
and larval rearing programs could provide an alternative source of spat. This study was
designed to evaluate the effect of different conditioning temperatures on the broodstock
maturation, spawning success and larval viability of two geographically (north and south of
the Iberian Peninsula) distinct populations of European clam (R. decussatus) collected at
different periods of the year in order to create ‘‘optimal’’ artificial spawning and larval
rearing programs. Two batches of clams from each population were collected in October
and February, and conditioned at 18 ± 1°C, 20 ± 1°C and 22 ± 1°C. Of the three variables
analysed the timing of broodstock collection was the most determining factor for
gametogenic development, spawning and larval rearing. Geographic origin and conditioning
temperature also greatly affected the spawning. The results also showed that the
February conditioning was more effective than October and that the best conditioning
temperatures were 20 ± 1°C and 22 ± 1°C for the northern and southern populations,
respectively. These results suggest that the efficient conditioning temperature for each
population of the same species is related to the seasonal temperature regime from their
geographic origin. Larval viability and growth performance seemed to be independent of
the broodstock conditioning. |
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