Marine and Freshwater Research Marine and Freshwater Research Society
Advances in the aquatic sciences
RESEARCH ARTICLE

Salinity tolerance of the eggs and larvae of the Australian grayling, Prototroctes maraena Gnnther (Salmoniformes : Prototroctidae)

GL Bacher and TA O'Brien

Australian Journal of Marine and Freshwater Research 40(2) 227 - 230
Published: 1989

Abstract

Eggs of the Australian grayling Prototroctes maraena were fertilized in the laboratory and the survival of eggs and larvae was investigated in salinities ranging from <0.1 to 30 g L-1. In salinities of <0.1, 5, 10 and 15 g L-1, most (81-90%) eggs survived to hatching; in salinities of 20, 25 and 30 g L-1, all eggs died. In salinities of <0.1 and 5 g L-1, all eggs that survived developed normally and the larvae survived for 21 d. In a salinity of 10 g L-1, all eggs that survived developed normally but the larvae were inactive and died within 6 h. In a salinity of 15 g L-1, many larvae were unable to emerge completely from the egg, were grossly deformed and died within 1 h of hatching. Newly hatched larvae were buoyant, positively phototropic and swam actively near the water surface. They survived in salinities ranging from <0.1 to 30 g L-1 for 21 d, at which time yolk absorption was complete. Death was probably the result of starvation.

https://doi.org/10.1071/MF9890227

© CSIRO 1989


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