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- W1979465622 abstract "Abstract The salinity tolerance of eggs, larvae, and juveniles of blacknose silverside Chirostoma promelas was investigated with the objective of optimizing hatchery practice. A high proportion (>90%) of eggs became eyed in all salinities. Eggs exposed to an instantaneous change of salinity hatched best at 0–15 practical salinity units (psu; 1 psu ≈ 1‰); reduced hatching occurred at 20 psu and no hatching occurred at 25–35 psu. By contrast, eggs exposed after 5 d to a slow change of salinity to freshwater over 48 h also hatched well at 0–15 psu, but they hatched at higher salinities as well. Fungal infections of eggs were greatest at 0 and 5 psu. Larvae exposed to an instantaneous change of salinity (0–25 psu) had the best survival rates at salinities of 0 psu (83%) and 5 psu (87%), but lower survival was obtained at 10 psu (49%) and 15 psu (22%) after 144 h. At 20 and 25 psu, larval mortality was 90% and 100%, respectively, after 48 h. In contrast, larvae exposed to a slow change of salinity over 48 h showed a higher salinity tolerance (43% survival at 20 psu), although higher salinities killed the fish. Juveniles had a high tolerance (100% survival) to a slow salinity change over 48 h at 0–25 psu. After 90 d, survival was best at 5–20 psu, optimal growth occurring at 5, 10, and 15 psu. Mortality was 100% in fish reared in freshwater after 75 d of culture, possibly a result of the high stress at this salinity. The osmolarity of muscle tissue of juveniles was not significantly different ( P > 0.05) between trials, indicating efficient internal ionic regulation at all salinities. The wide salinity tolerance of blacknose silverside is clearly beneficial for its management and culture." @default.
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- W1979465622 date "2008-01-01" @default.
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- W1979465622 title "Effects of Salinity on Eggs, Larvae, and Juveniles of Blacknose Silversides from Lake Chapala, Mexico" @default.
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- W1979465622 doi "https://doi.org/10.1577/a06-026.1" @default.
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