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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. Springer: London. ISSN 0967-6120, more
Peer reviewed article

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Keywords
    Artificial spawning; Bivalves; Conditioning; Induced breeding; Spawning; Ruditapes decussatus (Linnaeus, 1758) [WoRMS]; Marine

Authors  Top 
  • Matias, M.
  • Joaquim, S.
  • Leitão, A.
  • Massapina, C.

Abstract
    Culture of Ruditapes decussatus is clearly limited by the availability of seed, asthis production proceeds almost exclusively from natural recruitment. Artificial spawningand larval rearing programs could provide an alternative source of spat. This study wasdesigned to evaluate the effect of different conditioning temperatures on the broodstockmaturation, spawning success and larval viability of two geographically (north and south ofthe Iberian Peninsula) distinct populations of European clam (R. decussatus) collected atdifferent periods of the year in order to create ‘‘optimal’’ artificial spawning and larvalrearing programs. Two batches of clams from each population were collected in Octoberand February, and conditioned at 18 ± 1°C, 20 ± 1°C and 22 ± 1°C. Of the three variablesanalysed the timing of broodstock collection was the most determining factor forgametogenic development, spawning and larval rearing. Geographic origin and conditioningtemperature also greatly affected the spawning. The results also showed that theFebruary conditioning was more effective than October and that the best conditioningtemperatures were 20 ± 1°C and 22 ± 1°C for the northern and southern populations,respectively. These results suggest that the efficient conditioning temperature for eachpopulation of the same species is related to the seasonal temperature regime from theirgeographic origin. Larval viability and growth performance seemed to be independent ofthe broodstock conditioning.

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