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- W2068992185 abstract "The knowledge of the inherent reproductive patterns of wild prawn (shrimp) populations is essential in predicting the expected performance of hatchery broodstock. In response to problems of variable hatchery performance of penaeid broodstock at some times of the year, the inherent seasonal variability and the effects of broodstock age on reproductive performance of Penaeus semisulcatus were examined. The investigation of these effects, using a penaeid for which the detailed reproductive ecology was well known, provided a proxy from which to describe the general case likely applicable to other farmed species. During the three-year study, assessments were made for broodstock of known but increasing age collected from the wild overall seasons (at 2-monthly intervals), and from the two distinct age-cohorts present in the same season. The reproductive performance of the broodstock was assessed at each stage of the maturation and spawning process. Measures of maturation rate, spawning rate, fecundity, hatch rate, larval survival rate, and larval production rate were obtained. Inherent temporal patterns in the measures of reproductive performance were found for the main annual cohort of the wild stock. The rates of spawning, egg production, nauplii production and protozoeae production were lowest in autumn when females were 6 months old, increased through to a spring peak (at 12 months old), and then declined by early summer by which time females were 14 months old. Broodstock survival, egg hatching and metamorphosis of nauplii to protozoeae were unaffected by time of year. Trials with two age-cohorts present in the same season enabled us to separate the effects of age and season. Twelve-month-old broodstock outperformed 6-month-old broodstock, regardless of season. Age was the best predictor of reproductive performance. An optimal age of 12 months for best reproductive performance was identified. This information can be used to select broodstock for hatchery production. The findings may be applicable to other species of farmed penaeids." @default.
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- W2068992185 date "1997-09-01" @default.
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- W2068992185 title "Seasonal and age variability in the reproductive performance of Penaeus semisulcatus broodstock: optimising broodstock selection" @default.
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- W2068992185 doi "https://doi.org/10.1016/s0044-8486(97)00109-9" @default.
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