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SEASONAL CHANGES IN THE BIOCHEMICAL COMPOSITION AND ENERGY CONTENT OF THE RED SWAMP CRAYFISH PROCAMBARUS CLARKII (GIRARD) IN THE LOWER MONDEGO RIVER VALLEY, PORTUGAL

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ABSTRACT Nucleic acids (DNA and RNA), protein, lipid (triglycerides, phospholipid, and cholesterol), carbohydrate, and caloric contents of soft tissues of Procambarus clarkii were determined at intervals over the year to investigate whether seasonal changes in the biochemical composition and energy contents of P. clarkii in the lower Mondego River valley, Portugal, depend on nutritional or reproductive cycles. Total lipid, triglycerides, and total caloric contents significantly changed seasonally throughout the year. An increase was observed during the April/June (spring), followed by a decrease during June/October (summer) to levels maintained through the winter period (January/March). Therefore, P. clarkii does not store significant nutritional reserves for use during winter. Furthermore, the seasonal changes of total lipid, triglycerides, and total caloric contents of P. clarkii appear to be associated with the reproductive cycle of the species rather than with the nutritional cycle. Seasonal changes in the protein and carbohydrate contents were relatively limited and do not appear to be related to nutritional metabolism. Seasonal changes in the phospholipid, cholesterol, and nucleic acid contents were also observed in parallel with the main reproductive period of the species.

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/content/journals/10.1163/193724094x00704
1994-01-01
2016-12-07

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