Use of biochemical indices for analysis of growth in juvenile two-spotted gobies Gobiusculus flavescens of the Baltic Sea.

Frommel, Andrea and Clemmesen, Catriona (2009) Use of biochemical indices for analysis of growth in juvenile two-spotted gobies Gobiusculus flavescens of the Baltic Sea. Open Access Scientia Marina, 73 (S1). pp. 159-170. DOI 10.3989/scimar.2009.73s1159.

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Abstract

Multiple biochemical measurements were evaluated as an indirect measure of juvenile fish growth rate. Juvenile two-spotted gobies, Gobiusculus flavescens (Fabricius), caught in the Kiel Bight, were incubated in a temperature gradient table at 7 different temperatures ranging from 9 to 22.7°C for up to 28 days and sampled weekly. RNA/DNA ratios (RNA/DNA), protein and lipid amounts were measured in whole fish homogenates and compared with calculated weight-based growth rates of the individuals. RNA/DNA values were not significantly correlated with weight-specific growth rates. Lipid- and protein-based growth rates, on the other hand, were highly correlated with weight-specific growth (R2 of 0.4-0.5) and lipid-based growth rate explained 45.8% variability of weight-based growth in a linear growth model. Weight-based growth rates showed a dome-shaped relationship to temperature with a maximum around 16°C, a trend mirrored in lipid-based growth rates. The results indicate a stage-dependent shift in energy storage and metabolism with a decoupling of RNA/DNA as an index of weight-based growth rate as the juvenile gobies mature and lipids become the main determinant of weight-based growth in these fish.

Document Type: Article
Keywords: Gobiusculus flavescens; juveniles; temperature; growth; RNA/DNA; biochemical indicators
Research affiliation: OceanRep > GEOMAR > FB3 Marine Ecology > FB3-EV Marine Evolutionary Ecology
OceanRep > The Future Ocean - Cluster of Excellence
Refereed: Yes
Open Access Journal?: Yes
DOI etc.: 10.3989/scimar.2009.73s1159
ISSN: 0214-8358
Projects: Future Ocean, AQUASHIFT
Date Deposited: 17 Nov 2009 10:06
Last Modified: 22 Jan 2018 14:04
URI: http://oceanrep.geomar.de/id/eprint/632

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