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Adaptation Studies with the Argentine Pearl Fish, Cynolebias bellottii, for Its Introduction into California

Ernest C. Bay
Copeia
Vol. 1966, No. 4 (Dec. 23, 1966), pp. 839-846
DOI: 10.2307/1441411
Stable URL: http://www.jstor.org/stable/1441411
Page Count: 8
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Adaptation Studies with the Argentine Pearl Fish, Cynolebias bellottii, for Its Introduction into California
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Abstract

The cyprinodontid annual fish, Cynolebias bellottii Steindachner, was successfully field-reared and propagated at Riverside, California, with eggs and adult fish subjected to climatic conditions which were the reverse of those in its native habitat (Brazil, Argentina, and Uruguay). Egg production during midsummer (July-August) was appreciably less than during autumn; and during the winter embryonic development was delayed for as long as 10 months. Less than 0.1% of overwintering eggs hatched when flooded after 7½ months (24 May 1965).

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