Hormonal changes in male white bass (Morone chrysops) and evaluation of milt quality after treatment wit

Mylonas, Costadinos C.; Gissis, Ahikam; Magnus, Yoav; Zohar, Yonathan

doi:10.1016/s0044-8486(97)00021-5

Cited by 68 publications

(45 citation statements)

References 42 publications

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“…During the observation males were already spermiated, since the spermiation in Eurasian perch may occur from November to April (Alavi et al, 2010). Because in early spermiation process the most important role plays 11-ketotestosterone instead of DHP (Schulz et al, 1994;Mylonas et al, 1997;Alavi et al, 2010), it may be suggested that this hormone may act as a pheromone affecting progress of maturation in females at such early stages of maturation, as in the present study. However, this phenomenon need to be more closely studied.…”

Section: Discussionsupporting

confidence: 55%

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Żarski¹

2012

Turk. J. Fish. Aquat. Sci.

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The effect of pheromonal stimulation on the progress of maturation in wild Eurasian perch, Perca fluviatilis, females was determined. The females were kept in two separate tanks in a flow through system (12°C). (experimental group) males were placed together with females into one of the tanks. A second tank was without males. The maturation stage of females was determined in vivo every 10 days up to day 30. The results obtained indicated that pheromonal stimulation induced uneven maturation and significant diversification of maturation stages (from I to V) in females that were kept with males. In females kept without males 90% of fish were still in stage I. The results suggest that spawners of both sexes should be kept together if it is necessary to stimulate reproduction, whereas they should be kept separately in order to synchronize or delay the spawning.

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Section: Discussionsupporting

confidence: 55%

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Żarski¹

2012

Turk. J. Fish. Aquat. Sci.

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“…In landlocked salmon (Salmo salar m. sebago Girard), sperm volume increased during the reproductive season (Piironen, 1985). Endocrinological events that regulate spermiation and milt hydration make the comparisons difficult (Mylonas et al, 1997;Vermeirssen et al, 2004). Also Campos-Mendoza et al (2004) noted that variation in day length during spawning period affected the sperm volume in males.…”

Section: Discussionmentioning

confidence: 99%

Changes of sperm quality parameters in Caspian roach (Rutilus rutilus caspicus) during spawning migration

Golpour¹,

Akhoundian²,

Khara³

et al. 2013

CZECH J ANIM SCI

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ABSTRACT:In this study, changes of pH, ionic (Na + , K + , Ca 2+ , and Mg 2+ ), biochemical (total protein, glucose, and cholesterol) compositions of seminal plasma, sperm motility traits (percentage of motile spermatozoa and sperm movement duration), and sperm production characteristics (sperm volume, spermatocrit, and sperm density) were studied in Caspian roach, Rutilus rutilus caspicus, during spawning migration. Sperm of 10 males was collected three times during the spawning migration (in February, March, and April). The results showed that sperm motility parameters (percentage of motile spermatozoa and sperm movement duration) changed significantly (P < 0.05) during the reproductive season, but sperm density, spermatocrit, and sperm volume did not show significant differences during spawning migration. Analyses performed at each sampling time (February, March, and April) showed significant differences (P < 0.05) in calcium, magnesium, potassium, and cholesterol, whereas there were no significant changes in Na + , pH, total protein, glucose, and cholesterol.

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“…Fish stimulated with CPH ovulated a few hours earlier than those of the Ovopel and Ovaprim groups, which is probably associated with the different level of action of these hormones on the hypothalamic-pituitarygonadal axis in the fish (Yaron, 1995;Mylonas et al, 1997). It has been widely observed that CPH (containing gonadotropins) influences the gonads directly and causes oocyte maturation (Kucharczyk et al, 1997a, Yaron et al, 2009, while Ovopel, Ovaprim and OVA-RH (combined with MET) are synthetic peptides affecting the gonads through the pituitary gland, which releases gonadotropins and causes gamete maturation (Brzuska, 2006;Jamróz et al, 2008;Krejszeff et al, 2008).…”

Section: Discussionmentioning

confidence: 97%

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Targońska¹,

Kupren²,

Kujawa³

et al. 2015

Turk. J. Fish. Aquat. Sci.

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This study presents the results of inducing spermiation and ovulation of dace (Leuciscus leuciscus L.) spawners collected from different parts in of Poland. Artificial reproduction was performed using carp pituitary homogenate (CPH), human chorionic gonadotropin (hCG), agents containing a GnRHa with a dopamine inhibitor supplement (Ovopel and Ovaprim, GnRHa combined with metoclopramide) and GnRHa alone conducted during the spawning season. Males from the control group produced similar volumes of semen and sperm motility as fish after hormonal preparation application. Stimulation of ovulation by manipulation of environmental factors as well as by GnRHa alone did not trigger ovulation within 70 hrs following administration of a resolving injection, but did cause GV migration. Applying GnRHa with the dopamine inhibitors or CPH produced 80-100 % ovulation in females. The differences in reproduction between fish populations were reflected in ovulation synchronization, which was highly variable among populations or embryo survival. The fish stimulated with CPH ovulated several hours earlier than those injected with GnRHa combined with a dopamine inhibitor. The data obtained in the present paper could be applied to the production of the rheophilic cyprinid stocking process and, consequently, could form an important tool in the conservation of endangered or over-exploited finfish populations.

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Hormonal changes in male white bass (Morone chrysops) and evaluation of milt quality after treatment wit

Cited by 68 publications

References 42 publications

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Changes of sperm quality parameters in Caspian roach (Rutilus rutilus caspicus) during spawning migration

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