Fish Reproduction and Stress

Gerking, Shelby D.

doi:10.1007/978-1-4899-3659-2_22

Cited by 24 publications

(11 citation statements)

References 30 publications

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“…The general behaviour of the fish, however, should tell the perceptive observer whether any fish suffers stress. The vital influence of stress on reproduction is not surprising as 'reproduction is the most sensitive of all the life functions to stress' (Gerking 1980).…”

Section: Discussionmentioning

confidence: 99%

“…The pH survival curve is very similar to that found in the desert pupfish, (Cyprinodon spp. ), when the viability of the eggs of this fish were tested under different temperature conditions (Gerking 1980) Pollimyrus isidori males build nests from plant material and guard eggs, free embryos and larvae for several weeks. The eggs are yolky, non-adhesive and rather big (2 mm); they are deposited into the anal fin (or anal fins?).…”

Section: Sternopygus Macrurusmentioning

confidence: 99%

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Reproduction and development of the weakly electric fish, Pollimyrus isidori (Mormyridae, Teleostei) in captivity

Kirschbaum

1987

Environ Biol Fish

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SynopsisNo clear sexual dimorphism occurs in Pollimyrus isidori. Females usually grew slightly larger than males. The anal-fin reflex, however, makes it easy to discriminate between males and females. Spawning took place during the first six hours of the dark phase, in the territory of the male. During each spawning act 2-4 eggs were laid. The male put the eggs into a well-hidden nest previously constructed from plant material. The eggs, free embryos, and larvae of several spawnings were guarded by the male for several weeks. The females laid on average 120 eggs per fractional spawning. The eggs were 2 mm in diameter, not adhesive and very yolky. Th!ere was a relationship between pH and viability (% embryos hatched). Hatching occurred on the third day after spawning. The respiratory network of segmental origin in the median fin fold was well developed in the free embryos. Transition to exogenous feeding occurred on day 14. The larval period ended when the fish .were 15 mm long and 40-50 days old. First gonadal recrudescence occurred at a total length of 6cm (about 200 days old). The environmental factors decreasing conductivity and pH, increasing water level, and imitation of rain led to gonadal recrudescence, but pH did not act as a cue. Recrudescence was triggered by a decrease of conductivity, but absolute values or ionic composition of the water were not important. Maturation was completed after about fifty days. Mature and spawning fish no longer required any variation of these environmental factors to maintain mature gonads. A steady and considerable increase in conductivity led to gonadal regression. The fish did not show postbreeding refractoriness.

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Section: Discussionmentioning

confidence: 99%

Section: Sternopygus Macrurusmentioning

confidence: 99%

Reproduction and development of the weakly electric fish, Pollimyrus isidori (Mormyridae, Teleostei) in captivity

Kirschbaum

1987

Environ Biol Fish

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“…A more proximate explanation for the observed differences in reproduction may lie in abiotic factors as they affect the ecophysiology of mosquitofish. Reproduction and growth are affected by temperature, salinity and pH (Gerking 1979). The latter two variables were significantly different between the two habitats.…”

Section: Discussionmentioning

confidence: 99%

Comparative life history of female mosquito fish, Gambusia affinis, in tidal freshwater and oligohaline habitats

Brown‐Peterson

Peterson

1990

Environ Biol Fish

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SynopsisFemale Gambusia afinis were collected from low salinity/near-neutral pH and tidal freshwater/low pH localities to document life history variation between these two habitats. Mosquitofish were 2.7 times more abundant in low salinity/near-neutral pH (2.37 5 0.72ppt; pH = 5.73 + 0.11) than in tidal freshwater/low pH (0.27 + 0.19 ppt; pH = 4.46 + 0.18) habitats in Old Fort Bayou, a black-water tidal river of the Biloxi Bay estuary, Mississippi. Fish were common in both areas from June 1985 through February 1986. There were no significant differences between habitats in the length-weight relationships during the reproductive season with the exception of February. However, there were significant differences in life histories, although the areas were only 4 km apart. Ovarian recrudescence was observed in fish from both areas in February, but ovaries of low salinity fish were more developed than ovaries of freshwater fish. All fish from both areas had regressed ovaries by late September. The monthly slopes of the brood size vs. standard length regressions were significantly different between areas throughout the reproductive season with the exception of June. Although freshwater fish produced heavier tail-free embryos, fish from low salinity had significantly higher GSI values and brood size throughout the reproductive season. These observations suggest that Gambusia afinis may have a greater reproductive effort in low salinity/near-neutral pH environments than in freshwater/low pH habitats.

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“…An inhibitory effect of high salinity on reproductive performance was evidenced by a marked decline in fertilization success at salinities of 27 and 36 ppt, suggesting that salinity affected gamete quality. These effects may be initiated either directly as ga-metes enter the external medium, or indirectly through osmotic stress on parental fish, as gametogenesis in fish is known to be sensitive to systemic stresses such as temperature and pH (Gerking 1979). In Taiwanese red tilapia, breeding behavior is inhibited in brackish and seawater (Liao and Chang 1983), suggesting that behavioral factors may also influence fertilization success at different salinities.…”

Section: Discussionmentioning

confidence: 99%

The Effects of Salinity on Reproductive Performance of Florida Red Tilapia

Watanabe

Burnett

Olla

et al. 1989

J World Aquaculture Soc

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The reproductive performance of yearling Florida red tilapia broodstock was studied in laboratory aquaria at salinities of 1 (freshwater), 9, 18, 27 and 36 ppt under controlled photoperiod (14 L:10 D) and temperature (28 C). Spawning was observed at all salinities, although egg production per unit female weight at each spawn was significantly higher at 1 ppt than at higher salinities. An inhibitory effect of salinity on reproductive performance was evidenced by a trend toward lower fertilization, hatching, and survival of prejuveniles with increasing salinity. Fry production per unit female weight declined at salinities above 18 ppt. The results suggest that Florida red tilapia broodstock may be maintained under salinities as high as 18 ppt without impairing fry production, suggesting that hatchery production in brackishwater would be practical in areas where freshwater resources are limiting.

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Fish Reproduction and Stress

Cited by 24 publications

References 30 publications

Reproduction and development of the weakly electric fish, Pollimyrus isidori (Mormyridae, Teleostei) in captivity

Reproduction and development of the weakly electric fish, Pollimyrus isidori (Mormyridae, Teleostei) in captivity

Comparative life history of female mosquito fish, Gambusia affinis, in tidal freshwater and oligohaline habitats

The Effects of Salinity on Reproductive Performance of Florida Red Tilapia

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