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The ontogeny of physiological response to temperature in early stage spiny lobster (Jasus edwardsii) larvae

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posted on 2023-05-16, 15:18 authored by Bermudes, M, Ritar, AJ
The physiological response to temperature, in terms of oxygen consumption, nitrogen excretion and feed intake was examined in Jasus edwardsii larvae at mid-stages I-III. From stage I to stage III, the mass-specific oxygen consumption increased in a sigmoid pattern over the temperature range of 10-22°C. The Q 10 value declined significantly from 14-18 to 18-22°C range, indicating a reduced temperature dependence of larval metabolism at higher temperatures. At all stages, feed intake increased with increasing temperature but reached a plateau at the higher temperatures for stages I and II larvae. In contrast, nitrogen excretion increased linearly over this temperature range for all larval stages. Therefore, higher temperatures (∼22°C) may cause an energetic imbalance and reduce growth potential in early stage larvae. While the convection requirement index (quotient of feed intake and oxygen consumption) indicated an equivalent metabolic feeding efficiency from 14 to 22°C, a consistent decline of the O/N ratio above 16-18°C from stage I to stage III suggested that exposure to elevated temperatures may result in an increase in the amount of protein being diverted from growth to catabolic processes. Based on these results, a temperature of 18°C is recommended for the culture of early stage J. edwardsii larvae. © 2004 Elsevier Inc. All rights reserved.

History

Publication title

Comparative Biochemistry and Physiology Part A Molecular and Integrative Physiology

Volume

138

Pagination

161-168

ISSN

1095-6433

Department/School

Institute for Marine and Antarctic Studies

Publisher

Elsevier Science

Place of publication

New York

Repository Status

  • Restricted

Socio-economic Objectives

Fisheries - aquaculture not elsewhere classified

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