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Additional resources for Reproduction: Behavior and Fertility Control
1976; Tavolga, 1956; Teeter, 1980). However, it is not clear from any of these studies that the tested ovarian fluids were free of contamination by urine, and it is of interest that Yamazaki and Watanabe 14 N . R. LILEY AND N . E . STACEY (1979) speculated that the source of an attractant in female goldfish may be the kidney rather than the ovary. This suggestion is based on the observation that treatment with estrogen causes conspicuous changes in the kidneys of hypophysectomized male goldfish.
However, the unanswered question is: Does the female signal? Raising this question in no way diminishes the role of such chemicals in 16 N . R. LILEY AND N . E. ” In particular there is a need for more careful investigation of the source and nature of the chemical products affecting behavior. , 1974), there is little clear evidence of evolutionary specialization in the synthesis and release of the supposed chemical signals. Even less is known of the mechanisms involved in the regulation of pheromone production and the relationship between supposed pheromones and the endocrine system.
Lindsay (1974)conducted a careful examination of this particular aspect and found that masculinized guppy females performed fewer displays and spent less time displaying than normal males; the frequency of gonopodial contacts (or attempts) remained the same. Aggressive behavior is also governed to some extent by androgen levels. Noble and Borne (1940) observed that females of Xiphophorus helleri treated with testosterone propionate rose in the pecking order until a reversal in sexual behavior occurred.