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Cephalopod hatchling growth: the effects of initial size and seasonal temperatures

Authors :
Jayson M. Semmens
Stephen C. Leporati
Gretta T. Pecl
Source :
Marine Biology. 151:1375-1383
Publication Year :
2006
Publisher :
Springer Science and Business Media LLC, 2006.

Abstract

Temperature is known to have a strong influence on cephalopod growth during the early exponential growth phase. Most captive growth studies have used constant temperature regimes and assumed that populations are composed of identically sized individuals at hatching, overlooking the effects of seasonal temperature variation and individual hatchling size heterogeneity. This study investigated the relative roles of initial hatchling size and simulated natural seasonal temperature regimes on the growth of 64 captive Octopus pallidus over a 4-month period. Initial weights were recorded, and daily food consumption and fortnightly growth monitored. Two temperature treatments were applied replicating local seasonal water temperatures: spring/summer (14–18°C) and summer/autumn (18–14°C). Overall octopuses in the spring/summer treatment grew at a rate of 1.42% bwd−1 (% body weight per day) compared to 1.72% bwd−1 in the summer/autumn treatment. Initial size influenced growth rate in the summer/autumn treatment with smaller octopuses (

Details

ISSN :
14321793 and 00253162
Volume :
151
Database :
OpenAIRE
Journal :
Marine Biology
Accession number :
edsair.doi...........6bae94d005ea260bc07a95cd575091fc
Full Text :
https://doi.org/10.1007/s00227-006-0575-y