3 Hormonal Control of Oocyte Final Maturation and Ovulation in Fishes

In vitro steroid stimulation of final maturation in oocytes of rock bass (Ambloplites rupestris) (*)

“…In addition, the overall pattern in the specificity of steroid stimulation also follows closely that observed previously in trout, pike (Esox luciusl, goldfish (Carassius auratus) and yellow perch (Jalabert, 1976 ;Fostier et al, 1973 ;Goetz and Bergman, 1978 ;Goetz, 1983). That is, 11-oxygenated corticosteroids are less effective than are 11-deoxygenated corticosteroids.…”

“…The sequence of final maturation in rock bass oocytes is very similar to that observed in yellow perch (Goetz, 1983 (Jalabert, 1976 ;Fostier et al, 1973 ;Duffey and Goetz, 1980 ;Nagahama et al, 1983) and for the only other perciform species extensively studied, the yellow perch (Goetz and Theofan, 1979). In addition, the overall pattern in the specificity of steroid stimulation also follows closely that observed previously in trout, pike (Esox luciusl, goldfish (Carassius auratus) and yellow perch (Jalabert, 1976 ;Fostier et al, 1973 ;Goetz and Bergman, 1978 ;Goetz, 1983).…”

“…That is, 11-oxygenated corticosteroids are less effective than are 11-deoxygenated corticosteroids. Also, as observed in various fish species, testosterone is relatively less effective and estrogens are totally ineffective (Goetz, 1983 …”

“…However, with the exception of investigations on yellow perch ( Perca flavescens), nearly all in vitro investigations have been conducted on salmonid species or teleosts closely related to salmonids. Subsequent analyses of the hormone levels in blood during final maturation have also concentrated on salmonids (Goetz, 1983 (Goetz and Bergman, 1978).…”

Effect of gonadotropin releasing‐hormone analogue and human chorionic gonadotropin on milt characteristics and gonadal steroids in yellowfin bream,Acanthopagrus australis(Sparidae)

“…In other species, particularly salmonids, the maturation of immature sperm is achieved through maturation-inducing hormone(s) (MIH) (Schulz et al 2001;Miura & Miura 2003;Swanson et al 2003). For many fish species, MIH has been identified as either a di-or trihydroxy derivative of progesterone (17α, 20β-dihydroxy-4-pregnen-3-one or 17α, 20β, 21-trihydroxy-4-pregnen-3-one) (Goetz 1983;Nagahama 1997;Yueh & Chang 1997;Ikeuchi et al 2001). The role of MIH during spermiogenesis, where haploid spermatids are restructured to flagellated spermatozoa, is not well understood (King & Young 2001).…”