Effects of photoperiod and temperature on gonadal activity in the cyprinid teleost, Notemigonus crysoleucas.
TLDR
The effects of various photoperiod-temperature regimes on gonadal activity in the cyprinid teleost, Notemigonus crysoleucas, were examined during several different phases of the annual reproductive cycle.Abstract:
1. The effects of various photoperiod-temperature regimes on gonadal activity in the cyprinid teleost, Notemigonus crysoleucas, were examined during several different phases of the annual reproductive cycle.2. Regardless of the time of year when the experiment is initiated a long photoperiod-warm temperature regime stimulates gonadal development to the prespawning condition or induces spawning. Neither a warm temperature alone nor a long photoperiod alone will stimulate final gonadal maturation.3. Notemigonus is not "refractory" to long photoperiod-warm temperature gonadal activation during the postspawning season.4. Short photoperiods in combination with warm temperatures cause gonadal regression in this species. A low temperature-short photoperiod regime does not induce gonadal involution.5. Spermatocyte formation and proliferation as well as the early phases of vitellogenesis occur independently of environmental factors. Final gonadal maturation and the rate of gametogenesis, however, depend on specifi...read more
Citations
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References
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Journal ArticleDOI
Environmental control of teleost reproductive cycles: a brief review
TL;DR: It is concluded that short term laboratory studies may lead to erroneous statements concerning the importance of exogenous factors in controlling annual reproductive cycles.
Journal ArticleDOI
The pineal organ: photoperiod and reproductive cycles in the goldfish, Carassius auratus L.
Journal ArticleDOI
A Study of the Reproductive Cycle of the Minnow in Relation to the Environment
TL;DR: The normal reproductive cycle of the minnow, Phoxinus laevis, is described, and some environmental factors which influence it are examined, finding that a certain critical temperature is necessary before the gonads can be stimulated to maturity.
Journal ArticleDOI
Photoperiod and Temperature Effects on the Gonads of Green Sunfish, Lepomis cyanellus (Rafinesque), during the Quiescent, Winter Phase of its Annual Sexual Cycle
Calvin M. Kaya,Arthur D. Hasler +1 more
TL;DR: Experiments on fish with regressed gonads during winter indicate that gonadal recrudescence is stimulated in both sexes of this species only by a combination of both elevated water temperatures and long (artificial) photoperiod during spring.