Influence of incubation temperature on body movements
of Atlantic cod (Gadus morhua L.) embryos and on size at hatch
R.H.
Peterson, D.J. Martin-Robichaud, P. Harmon-2004
Aquaculture Research, 35(5): 453-457
Abstract:
Body
movements of cod (Gadus morhua L.) embryos reared from fertilization
to hatch at 5.4°C were observed at various stages of development and at six
experimental temperatures ranging from 0-10°C. Frequency of cod embryo body
movements increased from zero at 42 degree-days post fertilization to
maximal at 73-82 degree-days (1 or 2 days prior to hatch). Embryos were most
active at 2°C (mean of 5.5 movements per 10 min), with activity
declining to less than 1/10 min at 8-10°C. Lengths of hatched cod
larvae reared at a series of constant temperatures (from 4-10°C) from
fertilization to hatch were greater at lower incubation temperatures.
Incubation temperatures of 2-4°C were found to be optimal for incubation of
cod eggs.
(Fisheries
and Oceans Canada, Biological Station, 531 Brandy Cove Road, St Andrews, NB,
Canada E5B 2L9. E-mail of D.J. Martin-Robichaud: martin-robichaudd@mar.dfo-mpo.gc.ca)