Journal ArticleDOI
Role of pineal and eyes in the regulation of ovarian activity and vitellogenin levels in the catfish exposed to continuous light or continuous darkness.
TLDR
Catfish subjected to pinealectomy, blinding, or both were exposed to continuous light or continuous darkness during the different phases of the annual reproductive cycle, indicating the involvement of extrapineal and extraocular photoreception in the regulation of reproductive activity in the catfish.Abstract:
To investigate the relative importance of pineal and eyes in ovarian activity, catfish subjected to pinealectomy, blinding, or both were exposed to continuous light (LL) or continuous darkness (DD) during the different phases of the annual reproductive cycle. Pineal or eyes have no influence on ovarian activity during the preparatory, prespawning, and spawning periods of the annual reproductive cycle under these photoregimes. However, the pineal accelerated ovarian activity under LL and DD during the postspawning period. Blinding alone has no effect on ovarian recrudescence under these regimes. However, combined surgery (blinded-pinealectomy) inhibited ovarian development under both these conditions, indicating that the pineal organ is more important than the eyes. Ovarian recrudescence occurred even in the absence of both pineal and eyes, indicating the involvement of extrapineal and extraocular photoreception in the regulation of reproductive activity in the catfish.read more
Citations
More filters
Journal ArticleDOI
The pineal organ of teleost fishes
Peter Ekstrzm,Hilmar Meissl +1 more
TL;DR: There are strong indications that the pineal organ is one component in a central neural system that constitutes the photoperiod-responding system of the animal, i.e. the system that is responsible for correct timing of daily and seasonal physiological rhythms.
Journal ArticleDOI
The stimulatory effects of long wavelengths of light on the ovarian development in the tropical damselfish, Chrysiptera cyanea
TL;DR: The present results demonstrate that in addition to photoperiod, light wavelength is important for induction of gonadal maturation of reef maturation and that LED becomes a useful tool for aquaculture.
Journal ArticleDOI
Effects of melatonin on thymic and oxidative stress dysfunctions during Trypanosoma cruzi infection
Vânia Brazão,Rafaela Pravato Colato,Fabricia Helena Santello,Gabriel T. do Vale,Natália A. Gonzaga,Carlos R. Tirapelli,José Clóvis do Prado +6 more
TL;DR: New antioxidant features that turn melatonin a potentially useful compound for the treatment of Chagas disease, a condition in which an excessive oxidative damage occurs, are revealed.
Journal ArticleDOI
Importance of photoperiods in the regulation of ovarian activities in indian major carp Catla catla in an annual cycle.
TL;DR: The results of this study provide the first evidence that photoperiod per se plays an important role in the seasonal maturation of ovary in a subtropical freshwater major carp.
Journal ArticleDOI
Cadmium effects on the retina of adult Danio rerio.
Bice Avallone,Roberta Crispino,Raimondo Cerciello,Palma Simoniello,Raffaele Panzuto,Chiara Maria Motta +5 more
TL;DR: It is demonstrated that cadmium toxicity causes significant degeneration and loss of organization at both macro and microscopic levels and that recovery of visual acuity is due to a regenerative process by Müller cells.
References
More filters
Book ChapterDOI
2 Environmental Influences on Gonadal Activity in Fish
TL;DR: To illustrate that knowledge gained concerning environmental influences on fish reproduction can be put to practical use, applications in aquaculture for broodstock management and induction of spawning are discussed in the chapter.
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
Studies on amphibian yolk. VII. Serum phosphoprotein synthesis by vitellogenic females and estrogen-treated males of Xenopus laevis.
R. A. Wallace,D. W. Jared +1 more
TL;DR: Female toads given 1000 units of human chorionic gonadotropin ovulated within 24 h and began to synthesize a phosphoprotein which appeared, but did not accumulate, in the serum.