New Zealand Journal of Marine and Freshwater Research abstracts
Behaviour of hatchery-reared and wild-caught 4th and 5th stage American
lobsters, Homarus americanus
Kathleen M. Castro
Department of Fisheries, Animal and Veterinary Sciences
University of Rhode Island
East Farm, Building 83
Kingston, Rhode Island 02881
United States
email: kcastro@uri.edu
J. Stanley Cobb
Department of Biological Sciences
University of Rhode Island
Kingston, Rhode Island 02881
United States
Abstract Behavioural deficiencies in 4th and 5th stage
hatchery-reared lobsters were examined using time budget analysis and predator
trials. Hatchery-reared 4th stage lobsters were found to behave differently
than wild-caught lobsters and differences existed between hatchery-reared
lobsters from different sources. Local hatchery-reared 4th stage lobsters
spent less time on shelter and suffered higher predator rates in laboratory
trials than both wild-caught 4th stage and lobsters reared in a hatchery
in Maine. Fifth stage hatchery-reared lobsters spent significantly more time
in shelter than their wild-caught counterparts. These differences may be
attributable to the lack of development of proper predator-avoidance behaviour
and need to be understood and corrected to maximise the effect of enhancement
projects.
Keywords Homarus americanus; hatchery-effects;
predator-prey; time budgets; behaviour; post-settlement processes
M04108; Online publication date 17 June 2005 Received 11 May 2004; accepted
10 March 2005
New Zealand Journal of Marine and Freshwater Research, 2005, Vol. 39:
963-972
0028-8330/05/3904-0963 © The Royal Society of New Zealand 2005
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