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Effect of Salinity on Survival, Growth, Body Composition, Oxygen Consumption, and Ammonia Excretion of Juvenile Spotted Scat
Author(s) -
Xu Jiabo,
Shui Chun,
Shi Yonghai,
Yuan Xincheng,
Liu Yongshi,
Xie Yongde
Publication year - 2020
Publication title -
north american journal of aquaculture
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.432
H-Index - 41
eISSN - 1548-8454
pISSN - 1522-2055
DOI - 10.1002/naaq.10117
Subject(s) - salinity , excretion , zoology , juvenile , biology , ammonia , growth rate , composition (language) , ecology , endocrinology , biochemistry , linguistics , philosophy , geometry , mathematics
The effects of five salinities (5, 10, 20, 30, and 35‰) on the survival, growth, body composition, oxygen consumption, and ammonia excretion of juvenile Spotted Scat Scatophagus argus (initial body size 3.3–3.4 cm body length and 2.0–2.3 g; final body size: 5.5–5.6 cm body length and 9.2–9.8 g) were studied. Salinity did not affect survival (>94%) or oxygen consumption rate ( OCR ) significantly, but it did affect growth, ammonia excretion rate ( AER ), and body composition. The growth rate was related to the combined effect of food intake (3.1–3.2%/d) and feed conversion efficiency (56.8–60.2%). The highest slope of the body length/weight with rearing time regression equation at 5‰ salinity was 0.0333/0.1137, which indicated that the growth rate of the fish at 5‰ salinity was higher than that of those at the other salinities for 70 d at 24.4 ± 0.4°C. The ammonia excretion rate decreased significantly with the increase of salinity. Low O:N ratios (5.6–19.2) occurred at salinities ranging from 5‰ to 35‰, indicating a protein‐dominated catabolism. Salinity affected crude protein content significantly, and high salinity was beneficial to protein deposition. The results indicated that juvenile Spotted Scat could adapt to a wide range of salinity, from 5‰ to 35‰. However, it is recommended that juveniles be cultured at low salinity (5‰).