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The effect of photoperiod on growth, survival, colour and activity of juvenile southern rock lobster, Jasus edwardsii

journal contribution
posted on 2023-05-16, 14:46 authored by Crear, BJ, Hart, PR, Craig ThomasCraig Thomas
Juvenile (1-10 g) southern rock lobsters. Jasus edwardsii, were subjected to five photoperiods [0L(light):24D(dark); 6L:18D; 12L:12D: 18L:6D; 24L:0D] during a 112-day trial, and growth, survival, colour, food consumption and activity were examined. Lobsters grown under the 6L:18D and 24L:0D photoperiods had significantly lower (P < 0.05) final mean weight and specific growth rate than any other treatments. Photoperiod had no effect on survival or colour of lobsters. Food consumption differed significantly during the first week of the trial; after 5 weeks, food consumption was similar in all treatments. Major peaks in activity occurred during dark periods for lobsters exposed to photoperiods that had a light:dark regime. Activity of lobsters exposed to continuous light or dark regimes remained constant and at low levels during the 24-h period. Food consumption or activity does not appear to determine the rate of growth of lobsters in the different photoregimes. One over-riding outcome of this and other studies on photoperiod is that the growth and survival response of juvenile J. edwardsii was not significantly better than those of the standard 12L:12D cycle.

History

Publication title

Aquaculture Research

Volume

34

Issue

6

Pagination

439-444

ISSN

1355-557X

Department/School

Institute for Marine and Antarctic Studies

Publisher

Blackwell Publishing Ltd

Place of publication

Oxford, United Kingdom

Repository Status

  • Restricted

Socio-economic Objectives

Fisheries - aquaculture not elsewhere classified

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