Effects of Hypoxia and Anoxia on Larval Settlement, Juvenile Growth, and Juvenile Survival of the Oyster Crassostrea virginica

S. M. Baker, R. Mann
1992 The Biological Bulletin  
The effects of hypoxia (1.5 mg O2 I-', 20% of air saturation) and anoxia (co.07 mg O2 1 -', < 1% of air saturation) on oyster (Crassostrea virginica) larval settlement, juvenile growth, and juvenile survival were studied. Settlement was reduced significantly (P < 0.05) in hypoxic treatments, as compared to normoxic treatments (7.3 mg O2 h-', 100% of air saturation), and almost no settlement took place in anoxic treatments. Atier 96 h, 38% and 4% of the larvae placed in hypoxic and anoxic
more » ... c and anoxic treatments had settled, while 79% settled in normoxic treatments. In the first 144 h after settlement, juveniles in hypoxic treatments grew one third as much as those in normoxic treatments, while juveniles in anoxic treatments did not grow at all. Median mortality times of recently settled juveniles in hypoxic and anoxic treatments were 13 1 h and 84 h, respectively. We conclude that hypoxic and anoxic waters have potentially detrimental effects on oyster settlement and recruitment.
doi:10.2307/1542120 pmid:29303670 fatcat:4ecxcasjsjg4ljij5avxsvcesy