Alterations in Liver Composition of Channel Catfish (Ictalurus punctatus) during Seasonal Acclimatization
| Autor: | Glenn Graham, Jeffrey Kent, C. Ladd Prosser |
|---|---|
| Rok vydání: | 1992 |
| Předmět: |
Tissue water
Glycogen Physiology Ecology Environmental factor Seasonality Biology medicine.disease_cause medicine.disease biology.organism_classification Acclimatization chemistry.chemical_compound Endocrinology Animal science chemistry Physiology (medical) Ictalurus medicine Animal Science and Zoology Composition (visual arts) Catfish |
| Zdroj: | Physiological Zoology. 65:867-884 |
| ISSN: | 0031-935X |
| DOI: | 10.1086/physzool.65.5.30158547 |
| Popis: | Compositional alterations in liver and heart in channel catfish during seasonal acclimatization were compared with patterns observed during temperature acclimation. Hepatosomatic index (HSI) was minimal in the summer (>25° C), highest in the spring and fall (12°-18° C), and intermediate in winter (4°-9° C). Alterations in heart (ventricle) mass were in the order winter > fall > summer and correlated with the pattern observed during acclimation. Liver protein content was relatively constant except in summer, when total liver protein was approximately half that of other seasons. Dietary insuficiency was indicated in summer animals by elevated tissue water content. Liver DNA, like HSI, showed maxima in fall and spring and minima in summer and winter. Liver RNA levels were lowest in the summer and highest in the spring. Protein/DNA and RNA/ DNA ratios increased from fall through winter to a maximum in the spring as a prelude to spawning but declined precipitously in the summer. Liver glycogen content, which w... |
| Databáze: | OpenAIRE |
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