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- W1987745327 abstract "Photoperiod and temperature manipulation were used to induce out-of-season spawning in striped bass Morone saxatilis Maturational status of 40 age V striped bass, held in five environmental chambers exposed to compressed 6 mo and 9 mo cycles and a 12 mo reference cycle, was monitored by monthly egg and gonadal (ultrasound) diameter measurements. The primary effect of shortened photothermal and reproductive cycles was a reduction in egg and ovary diameters, and the number of ovulating females. Egg diameters were directly related to cycle length, averaging 845 μm, 946 μm, and 1,073 μm for females held on the 6, 9, and 12 mo cycles, respectively. Ovary diameters of females held on the 6 mo cycle were smaller (19.6 mm) than those held on the 9 mo (27.4 mm) and 12 mo (24.5 mm) cycles. Ovary diameter was highly correlated with egg diameter (r= 0.91). The number of ovulating females decreased with cycle length, totalling 38%, 88%, and 100% in the 6, 9, and 12 mo cycles, respectively. However, no differences in fecundity (58,452 eggslkg) or fertility (39%) were detected between photothermal treatments or tank-spawned and strigspawned females. When held for a second 6 mo cycle, none of the females spawned repetitively. Males held on the 6 mo cycle had smaller testicular diameters (16.2 mm) than those held on 9 mo (23.6 mm) and 12 mo (19.2 mm) cycles. Testicular diameter of spermiating males (15.7 nun) was significantly larger than that of non-spermiating males (6.9 mm) in all cycles. The low number of spawning females and small egg, ovarian, and testicular diameter offish held on the 6 mo cycle suggest that subjecting striped bass brood stock to an abbreviated cycle length (<9 mo) constrains maturation development and reproductive success." @default.
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- W1987745327 date "1994-06-01" @default.
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- W1987745327 title "Induced Maturation of Striped Bass Morone saxatilis Exposed to 6, 9, and 12 Month Photothermal Regimes" @default.
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- W1987745327 doi "https://doi.org/10.1111/j.1749-7345.1994.tb00180.x" @default.
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