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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, 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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