Seasonal Androgen and Estrogen Patterns in the Goldfish, Carassius auratus

Schreck, Carl B.; Hopwood, M. L.

doi:10.1577/1548-8659(1974)103<375:saaepi>2.0.co;2

Cited by 41 publications

(14 citation statements)

References 4 publications

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“…Fish were intraperitoneally injected with 100 μL of the T injection solution, which resulted in a final T dosage of 3 μg/fish. Previous studies have shown that this dose leads to elevated T concentrations within the physiological range 30–45 min after injection (Huggard et al, 1996; Schreck and Hopwood, 1974). Similarly, a 30 mg/mL solution of estradiol (E 2 ; Sigma) was dissolved in methanol.…”

Section: Methodsmentioning

confidence: 99%

Rapid steroid influences on visually guided sexual behavior in male goldfish

Lord

Bond

Thompson

2009

Hormones and Behavior

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The ability of steroid hormones to rapidly influence cell physiology through nongenomic mechanisms raises the possibility that these molecules may play a role in the dynamic regulation of social behavior, particularly in species in which social stimuli can rapidly influence circulating steroid levels. We therefore tested if testosterone (T), which increases in male goldfish in response to sexual stimuli, can rapidly influence approach responses towards females. Injections of T stimulated approach responses towards the visual cues of females 30–45 min after the injection but did not stimulate approach responses towards stimulus males or affect general activity, indicating that the effect is stimulus-specific and not a secondary consequence of increased arousal. Estradiol produced the same effect 30–45 min and even 10–25 min after administration, and treatment with the aromatase inhibitor fadrozole blocked exogenous T’s behavioral effect, indicating that T’s rapid stimulation of visual approach responses depends on aromatization. We suggest that T surges induced by sexual stimuli, including preovulatory pheromones, rapidly prime males to mate by increasing sensitivity within visual pathways that guide approach responses towards females and/or by increasing the motivation to approach potential mates through actions within traditional limbic circuits.

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Section: Methodsmentioning

confidence: 99%

Rapid steroid influences on visually guided sexual behavior in male goldfish

Lord

Bond

Thompson

2009

Hormones and Behavior

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“…Hormone changes during these reproductive cycles in goldfish have been well characterized (Schreck and Hopwood 1974;Stacey et al 1979;Kagawa et al 1983a;Kobayashi et al 1985Kobayashi et al , 1986Kobayashi et al , 1987bKobayashi et al , 1988. Ovulation in goldfish can be manipulated by changes in water temperature and photoperiod.…”

Section: Introductionmentioning

confidence: 99%

Involvement of steroid hormones in the preovulatory gonadotropin surge in female goldfish

Kobayashi

Aida

Hanyu

1989

Fish Physiol Biochem

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Goldfish,Carassius auratus, spawn several times within a spawning season. A gonadotropin (GtH) surge occurs at the time of ovulation in this cyprinid species. This ovulatory GtH surge mediates the processes of final oocyte maturation and ovulation, and occurs at the end of each spawning cycle. Within a cycle, there is a shift in the predominant plasma steroid from estradiol to testosterone, and finally 17α, 20β-dihydroxy-4-pregnen-3-one at the time of the ovulatory GtH surge. High levels of testosterone were always observed before ovulation. When ovariectomized or sexually regressed female goldfish were implanted with testosterone, they exhibited a GtH surge which was similar to those normally observed at ovulation. These results strongly suggest that elevated plasma testosterone is an important physiological requirement for the occurrence of the GtH surge.

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“…Studies of seasonal changes in serum gonadal steroid hormone levels have revealed the seasonal patterns of hormone levels in several species including goldfish (Schreck et al 1974), flounder (Campbell et al 1976), plaice (Wingfield and Grimm 1977), bluefish, mackerel (MacGregor et al 198 1 ) , goby (Bonnin 1979), and several salmonid species (Sanchez-Rodrigues et al Campbell et al 1980;Stuart-Kregor et al 198 1 ;Fostier et al 1982;Scott, Bye, and Baynes 1980;Scott, Bye, Baynes et al 1980;Scott et al 1983). To our knowledge, no such studies have been made in an ictalurid species despite the importance of these species in North American aquaculture (Love11 1979;Bardach et al 1972).…”

Section: Introductionmentioning

confidence: 99%

Seasonal changes in serum testosterone, 11-ketotestosterone, and 17β-estradiol levels in the brown bullhead, Ictalurus nebulosus Lesueur

Burke¹,

Leatherland²,

Sumpter³

1984

Can. J. Zool.

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The seasonal changes in gonadosomatic index (GSI) and serum testosterone, 11-ketotestosterone, and 17β-estradiol levels were measured in adult feral brown bullheads, Ictalurus nebulosus Lesueur. The maximum GSI of both male and female brown bullheads was considerably lower than that of most other teleostean species investigated. In males, the GSI began to increase in April concomitant with an increase in water temperature from 3 to 6 °C. The maximum GSI levels were evident throughout May and June (during the prespawning and spawning periods). Peaks of serum testosterone and serum 11-ketotestosterone levels were evident in mid-April and late May to June, and in mid-April and mid-May, respectively. In females there was a rapid increase in GSI during May, when the ambient water temperature reached 16 °C. The peak GSI was evident in mid- to late-May and had declined by early June. Peak serum testosterone and 11-ketotestosterone levels were evident in mid-April and again in late May, whereas peak 17β-estradiol levels were found in mid-May and mid-June. The peak serum testosterone levels in females were 4.5-fold higher than in the males, whereas the 11-ketotestosterone levels were similar in males and females.

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Seasonal Androgen and Estrogen Patterns in the Goldfish, Carassius auratus

Cited by 41 publications

References 4 publications

Rapid steroid influences on visually guided sexual behavior in male goldfish

Rapid steroid influences on visually guided sexual behavior in male goldfish

Involvement of steroid hormones in the preovulatory gonadotropin surge in female goldfish

Seasonal changes in serum testosterone, 11-ketotestosterone, and 17β-estradiol levels in the brown bullhead, Ictalurus nebulosus Lesueur

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