Winter and Summer Growth of Bluegills in Fertilized Ponds

Autor: E. V. Smith, H. S. Swingle
Rok vydání: 1941
Předmět:
Zdroj: Transactions of the American Fisheries Society. 70:335-338
ISSN: 1548-8659
0002-8487
DOI: 10.1577/1548-8659(1940)70[335:wasgob]2.0.co;2
Popis: The use of fertilizers to increase the production of fish in ponds has become widespread in recent years. Since fish are cold-blooded animals, their metabolic activities are slowed by cold weather and accelerated by hot weather. Experiments were conducted to study the winter and summer growth of bluegill bream. In December, small fertilized ponds were stocked with bluegill fingerlings at the rate of 1,750 per acre, individuals averaging 3.8 grams in weight. Three months later their average weight had increased to 11.4 grams, a gain of 200 per cent. The water temperature during this period varied from 3° C. in January to 15° C. in March. Another fertilized pond was stocked in March at the rate of 1,500 fingerlings per acre, individuals averaging 4.5 grams in weight. Samples of bream taken from this pond in June averaged 80 grams, a gain of 1,700 per cent. The water temperature during the latter period ranged from 19° C. to 24° C. Thus, bream do grow during the winter in the South, but the growth i...
Databáze: OpenAIRE
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