Seasonal variations in the intermediate metabolism of Parastacus varicosus (Crustacea, Decapoda, Parastacidae)

The aim of this study was to analyze the seasonal variations in the metabolism of Parastacus varicosus and examine the possible relationships to its reproduction. Animals were sampled (9 h to 10 h) in each month in the Gravataí River, RS, Brazil. Haemolymph samples were collected from each crayfish...

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Bibliographic Details
Published in:Comparative biochemistry and physiology. Part A, Molecular & integrative physiology Molecular & integrative physiology, 2007-09, Vol.148 (1), p.204-213
Main Authors: da Silva-Castiglioni, Daiana, Kaiser Dutra, Bibiana, Oliveira, Guendalina Turcato, Bond Buckup, Georgina
Format: Article
Language:English
Subjects:
Analysis of Variance
Animals
Cambaridae
Crayfish
Crustacea
Crustacea - metabolism
Female
Freshwater
Gonads - metabolism
Hemolymph - metabolism
Hepatopancreas - metabolism
Male
Metabolism
Muscles - metabolism
Parastacidae
Parastacus varicosus
Seasonality
Seasons
Species Specificity
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Summary:The aim of this study was to analyze the seasonal variations in the metabolism of Parastacus varicosus and examine the possible relationships to its reproduction. Animals were sampled (9 h to 10 h) in each month in the Gravataí River, RS, Brazil. Haemolymph samples were collected from each crayfish in the field for determination of glucose, total proteins, total lipids, and total cholesterol. Hepatopancreas, abdominal muscle, and gonads were removed for determination of glycogen, total proteins, total lipids, and total cholesterol. ANOVA revealed significant seasonal differences in the biochemical composition of all tissues studied; when the sexes were compared these parameters did not show any significant difference in the hepatopancreas and muscle. However, in haemolymph we observed significant variation only in cholesterol and lipid levels. The results suggest that the metabolic variability is related to the stage of maturation of the gonads, in females, where the hepatopancreas and other tissue studies can store and transfer reserves to support maturation to complement the food intake. Variations in the gonadosomatic and hepatosomatic indices suggest that reproduction occurs principally in summer. As in other decapods, abiotic factors such as water temperature, oxygen content, etc. influence the intermediate metabolism.
ISSN:1095-6433
1531-4332
DOI:10.1016/j.cbpa.2007.04.005