The effects of estrogenic substances in lebistes reticulatus (Guppy)

Berkowitz, Philip

doi:10.1002/ar.1090710205

Cited by 22 publications

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“…We did not note, in a single case, the presence of spermatogonia in the ovaries of the treated fish. Furthermore, the studies of Yamamoto (1953Yamamoto ( , 1955Yamamoto ( , 1959 with medaka Oryzius latipes and Berkowitz (1941) with guppies Lebistes reticulatus (Peters) indicate that for sex reversal to occur, the steroid must be applied during the period of sexual differentiation. Thus, the indication of an alteration in the sex ratio due to the steroid in this study, has to be substantiated by further research.…”

Section: Discussionmentioning

confidence: 99%

Growth increments and some flesh and gonad characteristics of juvenile coho salmon receiving diets supplemented with 17α‐methyltestosterone

Fagerlund

McBride

1975

Journal of Fish Biology

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Juvenile coho salmon Oncorhynchus kisutch (Walbaum) received a diet of Oregon Moist Pellets supplemented with either 10, 1, 0.2 or 0 ppm of 17α‐methyltestosterone for 72 weeks. The fish were held in fresh water during the first 57 weeks and in salt water during the remaining time of the study. At the end of the fresh water residency, the fish receiving 10 and 1 ppm of steroid showed a net increase in weight of 125 and 71 % respectively over the controls. Both test groups also gained in length, but the 10 ppm group gained proportionately less, which resulted in a thicker body. After transfer to salt water at the normal time of smolting, there was a decrease in the rate of growth in weight and length of the two groups receiving the high doses of steroid. The decrease was most noticeable in the 10 ppm group and a number of mortalities occurred in this group. Testes of fish receiving 10 ppm of the steroid became hypertrophied and later degenerated with loss of spertnatogonia; the ovaries were not affected. 17α‐methyltestosterone fed at 10 ppm for 49 weeks increased the lipid content of the flesh from 2.4 to 3.5 % and decreased the amount of flesh from 35.0 to 28.5 % of body weight. No change in the moisture content was found. External changes noted in the 10 ppm group included loss of silvering, deepening of the body, particularly in the region of the anal fin, and widening of the lower jaw.

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Section: Discussionmentioning

confidence: 99%

Growth increments and some flesh and gonad characteristics of juvenile coho salmon receiving diets supplemented with 17α‐methyltestosterone

Fagerlund

McBride

1975

Journal of Fish Biology

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“…Le contrôle social de l'inversion sexuelle de diverses espèces (tropicales) d'hermaphrodites successifs est maintenant établi (Moyer et Nakazono, 1978 ;Fricke, 1979 ;Bruce, 1980), bien que les interactions sociales soient subtiles et le mode d'action des stimuli exogènes (phéromones ?) encore ignoré (Reinboth, 1980 (Yoshikawa et Oguri, 1978), soit une masculinisation des femelles (Nakamura, 1975 Yamamoto, 1953Yamamoto, , 1958Hishida, 1962Hishida, , 1964 Kawamoto, 1970 ; Satoh et Egami, 1973 ;Tilapia : Clemens et Inslee, 1968 ;Guerrero, 1975 ;Carassius : Yamamoto et Kajishima, 1968 ; Xiphophorus : Vallowe, 1957 ;Poecilia : Dzwillo, 1966 ;Takahashi, 1975a et (Takahashi, 1974, chez (Muller, 1969 ;Hackmann, 1974 chez Hemihaplochromis ; Hackmann, 1974, chez Cich l asomal, soit enfin en une féminisation de ces mêmes mâles chez Tilapia ; (Nakamura, 1975), chez divers Cichlidés (Hackmann, 1974 ;Hackmann et Reinboth, 1974) Spira, 1965, Yoshikawa et Oguri, 1978Berkowitz, 1941, Miyamori, 1964 Poecilia ;Padoa, 1937Padoa, , 1939Okada, 1973, chez Salmo). Ils provoquent également un début d'inversion sexuelle par induction d'une ovogenèse après dégénérescence des cellules mâles chez Oryzias (Yamamoto et Matsuda, 1963 ;…”

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