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Environmental effects on fish lobsters and crabs

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Green, BS and Gardner, C and Hochmuth, JD and Linnane, A (2014) Environmental effects on fish lobsters and crabs. Environmental effects on fish lobsters and crabs, online. ISSN 0960-3166 (In Press)

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Abstract

The fisheries for crabs and lobsters (Reptantia,
Decapoda) are shaped by environmental variation
through the distribution ecology, productivity or
even their market traits such as colour and size. Many
crabs and lobsters have a wide latitudinal distribution
and therefore are exposed to significant abiotic
gradients throughout their geographic range. Environmental
factors affect reptantians throughout their
complex life cycle, including embryo development,
timing and length of the spawning period, the duration
and quality of the larval stages, the level and spatial
distribution of the settlement, growth rates and size of
the juveniles, size at maturity, and catchability. The
most consistent environmental response is of growth
and reproduction to temperature. Growth rates
increase with increasing temperatures in a parabolic
function, tapering and then declining as the boundaries
of thermal tolerance are reached. With increasing
temperature the intermoult duration decreases. Once
the upper thermal boundary is reached, increases in
temperature result in longer intermoult duration and
smaller growth increments so that growth is reduced.
Declines in temperature generally suppress moulting,
and consequently reptantians rarely moult in winter.
Increasing temperature decreases the time for egg
incubation, larval development and the maturational
age. Catchability increases with water temperature and
also varies, although less predictably, with moon
phase and wind strength. Catchability decreases with
an increase in population density. Larval settlement of
many reptantian species depends on current strength,
increasing with the strength of certain local currents.
Reptantians can tolerate a wide-variety of conditions
and have flexible life-histories to respond to conditions
throughout their broad geographic ranges.
Information on environmental effects on reptantians
not only assists in understanding probable effects of
ocean warming and acidification, but also seasonal and
interannual changes in fisheries production

Item Type: Article
Keywords: Catchability Crabs Lobsters Temperature Salinity pH Oxygen Swell Lunar cycle
Journal or Publication Title: Environmental effects on fish lobsters and crabs
ISSN: 0960-3166
Identification Number - DOI: 10.1007/s11160-014-9350-1
Additional Information:

Copyright 2014 Springer

Date Deposited: 28 Apr 2014 23:09
Last Modified: 18 Nov 2014 05:00
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