The influence of temperature change on number of dorsal fin rays developing in Fundulus majalis (Walbaum) [cyprinodontid fish]
1980
Fahy, W.E. (North Carolina Univ. (USA). Inst. of Marine Sciences)
In each of two experiments embryos of this cyprinodontid fish were reared continuously in three fluctuating temperature regimes, 28-32 deg, 22-26 deg and 16-20 deg to determine the response of presumptive dorsal fin-ray tissue to temperature change. In both experiments a negative relationship was indicated between dorsal fin-ray counts and temperature. On average fewer dorsal fin rays formed with increasing temperature. Material is now available to compare, for the first time, the response of presumptive median fin-ray tissues to temperature in one species. That of the dorsal rays responded differently from those of the anal and caudal fin rays. The response of presumptive dorsal fin-ray tissue resembles that of vertebrae, not only the negative relationship to temperature, but like vertebrae, the number of dorsal fin rays forming on the average are influenced more by cold water than by warm water.
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