Fertilization dynamics in sockeye salmon and a comparison of sperm from alternative male phenotypes

Hoysak, Drew J.; Liley, N. R.

doi:10.1111/j.1095-8649.2001.tb02286.x

Cited by 112 publications

(55 citation statements)

References 39 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The overall confinement stress on both captive groups probably contributed to delayed maturation, higher egg retention rates, and especially depressed overall fertilization success compared with natal fish. The mean egg survival from captive fish (56%) were lower than eggs from natal spawners (88%) and published values for wild sockeye salmon (>90%)(Hoysak & Liley, 2001; Galbraith, 2003). Campbell et al .…”

Section: Discussionmentioning

confidence: 66%

See 1 more Smart Citation

The effect of exercise and captivity on energy partitioning, reproductive maturation and fertilization success in adult sockeye salmon

Patterson

Macdonald

Hinch

et al. 2004

Journal of Fish Biology

View full text Add to dashboard Cite

Releasing a population of adult Fraser River sockeye salmon Oncorhynchus nerka from an energetically more expensive non-feeding natural migration (1089 km, natal groups) and allowing them to sexually mature in either a moderate flow (captive exercise group) or a no flow (captive non-exercise group) environment resulted in significant differences in body energy densities (MJ kg À1 ) among groups (ranked: initial natural migrator > non-exercise > exercise > natal arrivals). Similarly, per cent body lipids were significantly lower in exercise females compared with non-exercise females, experimentally confirming the central role lipid catabolism has in powering swimming. Although restricting exercise did result in greater body energy reserves at spawning, this did not result in a reallocation of energy to reproduction, as fecundity, egg size and gonad composition were unchanged among the groups. Furthermore, non-exercise females had delayed maturity, lower egg deposition rates, and were more likely to die prior to egg ovulation than exercise females and natal spawners. Eggs from captive exercise adult females were more likely to survive to the eyed stage than eggs from captive non-exercise females, but both captive groups had significantly lower egg fertilization success than natal spawners suggesting that confinement stress played a role in some of results presented. There were no significant differences in plasma levels of glucose, lactate, cortisol and reproductive hormones among the groups, but correlations among acute and chronic indicators of stress were significant among individuals. These results indicate that exercise during the late stages of maturation, as might occur normally, may be required for optimizing reproductive maturation and maximizing reproductive success. # 2004 The Fisheries Society of the British Isles

show abstract

Section: Discussionmentioning

confidence: 66%

“…Consistent with other research, there were larger differences in viability among eggs from different females than among milt from different males (Nagler et al ., 2000; Hoysak & Liley, 2001). This individual variability was not correlated with any of the morphological, physiological or reproductive variables recorded from each parent.…”

Section: Discussionmentioning

confidence: 99%

The effect of exercise and captivity on energy partitioning, reproductive maturation and fertilization success in adult sockeye salmon

Patterson

Macdonald

Hinch

et al. 2004

Journal of Fish Biology

View full text Add to dashboard Cite

show abstract

“…Eggs are fertilized after a sperm cell enters the micropyle, which is barely wide enough to allow entry of one sperm cell (Ginsburg, 1963;Kobayashi and Yamamoto, 1981;Yanagimachi et al, 1992). Thus, in salmonids, where up to 80% of the eggs can be fertilized within the first 5 s of egg and sperm interactions (Hoysak and Liley, 2001), the first sperm cell to enter the micropyle fertilizes the egg (Kobayashi and Yamamoto, 1981;Yanagimachi et al, 1992). These female evolved characteristics may help enforce FIGURE 4 | The effect of relative motility PCA (i.e., per cent motile sperm cells and sperm velocity in ovarian fluid) and relative number of sperm cells on proportion of larvae sired for subdominant males ejaculating after the competing dominant male (asynchrony).…”

Section: Discussionmentioning

confidence: 99%

On the relative effect of spawning asynchrony, sperm quantity, and sperm quality on paternity under sperm competition in an external fertilizer

et al. 2015

View full text Add to dashboard Cite

Citation:Egeland TB, Rudolfsen G, Nordeide JT and Folstad I (2015) On the relative effect of spawning asynchrony, sperm quantity, and sperm quality on paternity under sperm competition in an external fertilizer. Front. Ecol. Evol. 3:77. doi: 10.3389/fevo.2015.00077 On the relative effect of spawning asynchrony, sperm quantity, and sperm quality on paternity under sperm competition in an external fertilizer How much of a fitness benefit is obtained by dominant males of external fertilizers from releasing ejaculates in synchrony with female egg-release when engaging in sperm competition, and what is the most important sperm trait for paternity in these situations? The Arctic charr (Salvelinus alpinus) is an external fertilizer experiencing intense male-male competition over reproductive opportunities including sperm competition. To compensate for their disadvantage the sneaker males, which often spawn out of synchrony with the female, produce more and faster sperm than the guarding males. We used controlled in vitro fertilization trials with experimentally produced dominant and subordinate, sneaker males to test what effect relative synchrony in gamete release, sperm quality (i.e., motility and velocity) and sperm quantity have on a male's fertilization success in pair-wise sperm competitions. When the sneaker males released ejaculates after the guarding male there was no overall difference in fertilization success. The quality (i.e., motility and velocity) of a male's sperm relative to that of the competing male was the best predictor of male fertilization success regardless of their mating tactic and spawning synchrony. The relative number of sperm cells also had an effect on fertilization success, but mainly when the dominant and sneaker male ejaculated synchronously. Our close imitation of natural sperm competition in charr shows that the sneaker males of external fertilizing species may fully compensate for their disadvantaged mating role by producing ejaculates of higher quality-an adjustment strangely not met by dominants.

show abstract

“…For example, eggs of the rainbow trout Oncorhynchus mykiss, and sockeye salmon Oncorhynchus nerka, lost their fertilizing capacity after 40 s (Hoysak and Liley, 2001;Liley et al, 2002). It has been shown that higher osmolality (up to 200 mOsm kg À1 ) significantly prolonged the period of time (up to 6 min) during which the eggs of this species retained their fertilization capability, as compared to eggs activated with freshwater (0 mOsm kg À1 ), where most eggs were incapable of fertilization after 60 s. Published data already suggested that duration of the ability of eggs to be fertilized is species-dependent.…”

Section: Discussionmentioning

confidence: 99%

The effect of osmolality on egg fertilization in common carp, Cyprinus carpio Linnaeus, 1758

et al. 2015

View full text Add to dashboard Cite

Summary The aim of the study was to investigate the effect of osmolality of the activating solution (AS) on in vitro fertilization of the eggs of common carp, Cyprinus carpio L. Four different AS (NaCl solutions) were used with different osmolalities: AS‐0 (distilled water), AS‐100 (100 mOsm kg−1), AS‐200 (200 mOsm kg−1) and AS‐300 (300 mOsm kg−1). Fertilization was performed in Petri dishes using freshly collected sperm. Insemination (sperm addition to activated eggs) was preceded by exposure of egg samples to each AS for 0 (control group), 15, 30, 60, 90, 120, 150, 180, 210, 240, 270, 300, 330 and 360 s. Embryonic survival was determined 24 h after incubation at 20°C. Additionally, motility parameters (motility rate [MOT, %] and curvilinear velocity [VCL, μm s−1]) of the spermatozoa activated with the tested AS were measured using a CASA (computer‐assisted sperm analysis) system. Motility duration (DUR, s) in each AS was also determined. The results revealed a significant effect of osmolality of the AS on the fertilizing capacity of common carp eggs. There were no viable embryos in the group AS‐300. In the group AS‐0, the eggs lost their ability for fertilization after 90 s; in the remaining groups, eggs could be fertilized for up to 150 s (group AS‐100) or 360 s (group AS‐200). Fertilization failure in the group AS‐300 was caused by the lack of spermatozoa activation in this solution. The present study findings for in vitro common carp fertilization indicate that special attention should be given to the AS osmolality, where 100 mOsm kg−1 was found to be the most suitable.

show abstract

Fertilization dynamics in sockeye salmon and a comparison of sperm from alternative male phenotypes

Cited by 112 publications

References 39 publications

The effect of exercise and captivity on energy partitioning, reproductive maturation and fertilization success in adult sockeye salmon

The effect of exercise and captivity on energy partitioning, reproductive maturation and fertilization success in adult sockeye salmon

On the relative effect of spawning asynchrony, sperm quantity, and sperm quality on paternity under sperm competition in an external fertilizer

The effect of osmolality on egg fertilization in common carp, Cyprinus carpio Linnaeus, 1758

Contact Info

Product

Resources

About