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- W1976071819 abstract "Gonadic conditioning of pearl oyster Pinctada mazatlanica was studied under two water temperature regimes using cultured specimens. Before starting conditioning, specimens were induced to spawn with thermal shock. Two different regimes were evaluated, controlled temperatures (CT) and gradually increasing temperatures (IT). In both trials, specimens were fed daily with Isochrysis galbana and Chaetoceros gracilis in a proportion of 7:3. Gonad and muscle samples were excised from the oysters every 15 days and processed for histological analysis. Condition Index and Muscle Condition Index were calculated. Similarly, oocyte frequency and oocyte diameter measurements were made. ANOVA analyses were used to test significant differences in the frequency and diameter of postvitellogenic oocytes, and values of both condition indexes between temperature regimes, and over time. The IT showed more suitable conditions for gonad conditioning than CT, although the time needed for reaching maturity was higher in the former regime. For CT, a temperature of 24°C was the best for conditioning, since there were no traces of atretic oocytes, partially spawned specimens, and there were less previtellogenic oocytes and more postvitellogenic oocytes filling the follicles. At 20°C, no positive results were noticed. Condition indexes appear to be reliable indicators of gonad activity during conditioning in both trials. The ANOVA analysis detected significant differences in almost all the statistical treatments run for oocyte frequency, oocyte diameter and condition indexes according to temperature regime and over time." @default.
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- W1976071819 date "2001-04-01" @default.
- W1976071819 modified "2023-10-16" @default.
- W1976071819 title "Gonadic conditioning of the calafia mother-of-pearl oyster, Pinctada mazatlanica (Hanley, 1856), under two temperature regimes" @default.
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- W1976071819 doi "https://doi.org/10.1016/s0044-8486(00)00552-4" @default.
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