Abstract
In seasonally breeding fish species, altered fecundity, fertility, and spawning interval are associated with changes in environmental cues such as temperature and photoperiod. To determine quantitative impact of these cues on a suite of reproductive endpoints, groups of medaka (Oryzias latipes, two breeding pairs per group) were subjected to varying photoperiod and temperature regimes. Embryo production ceased after photoperiod reduction from 16L:8D to 8L:16D (at 25°C). A severe decline in production was observed after a temperature decrease of 10°C (25°C to 15°C [16L:8D]). Under reduced photoperiod, histologic analysis showed no mature ova and moderate oocyte atresia in all individuals. However, reduced temperature (15°C) produced only mild oocyte atresia and fewer mature ova. Under both reduced photoperiod and reduced temperature regimes, mature spermatozoa were observed. Offspring viability, along with spawning interval, were not affected by photoperiod reduction. Temperature change had no effect on offspring viability but caused an increase in spawning interval. A shortened photoperiod profoundly affected medaka reproduction, whereas decreased temperature reduced, but did not arrest, fertility; reduced photoperiod decreased fecundity. These findings have important implications for culture of medaka as well as use of this teleost model for reproductive toxicology studies.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 1287-1293 |
| Number of pages | 7 |
| Journal | Biology of Reproduction |
| Volume | 61 |
| Issue number | 5 |
| DOIs | |
| State | Published - 1999 |
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ASJC Scopus subject areas
- Cell Biology
- Developmental Biology
- Embryology
Cite this
Variations of light and temperature regimes and resulting effects on reproductive parameters in medaka (Oryzias latipes). / Koger, C. S.; Teh, Swee J; Hinton, David E.
In: Biology of Reproduction, Vol. 61, No. 5, 1999, p. 1287-1293.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Variations of light and temperature regimes and resulting effects on reproductive parameters in medaka (Oryzias latipes)
AU - Koger, C. S.
AU - Teh, Swee J
AU - Hinton, David E.
PY - 1999
Y1 - 1999
N2 - In seasonally breeding fish species, altered fecundity, fertility, and spawning interval are associated with changes in environmental cues such as temperature and photoperiod. To determine quantitative impact of these cues on a suite of reproductive endpoints, groups of medaka (Oryzias latipes, two breeding pairs per group) were subjected to varying photoperiod and temperature regimes. Embryo production ceased after photoperiod reduction from 16L:8D to 8L:16D (at 25°C). A severe decline in production was observed after a temperature decrease of 10°C (25°C to 15°C [16L:8D]). Under reduced photoperiod, histologic analysis showed no mature ova and moderate oocyte atresia in all individuals. However, reduced temperature (15°C) produced only mild oocyte atresia and fewer mature ova. Under both reduced photoperiod and reduced temperature regimes, mature spermatozoa were observed. Offspring viability, along with spawning interval, were not affected by photoperiod reduction. Temperature change had no effect on offspring viability but caused an increase in spawning interval. A shortened photoperiod profoundly affected medaka reproduction, whereas decreased temperature reduced, but did not arrest, fertility; reduced photoperiod decreased fecundity. These findings have important implications for culture of medaka as well as use of this teleost model for reproductive toxicology studies.
AB - In seasonally breeding fish species, altered fecundity, fertility, and spawning interval are associated with changes in environmental cues such as temperature and photoperiod. To determine quantitative impact of these cues on a suite of reproductive endpoints, groups of medaka (Oryzias latipes, two breeding pairs per group) were subjected to varying photoperiod and temperature regimes. Embryo production ceased after photoperiod reduction from 16L:8D to 8L:16D (at 25°C). A severe decline in production was observed after a temperature decrease of 10°C (25°C to 15°C [16L:8D]). Under reduced photoperiod, histologic analysis showed no mature ova and moderate oocyte atresia in all individuals. However, reduced temperature (15°C) produced only mild oocyte atresia and fewer mature ova. Under both reduced photoperiod and reduced temperature regimes, mature spermatozoa were observed. Offspring viability, along with spawning interval, were not affected by photoperiod reduction. Temperature change had no effect on offspring viability but caused an increase in spawning interval. A shortened photoperiod profoundly affected medaka reproduction, whereas decreased temperature reduced, but did not arrest, fertility; reduced photoperiod decreased fecundity. These findings have important implications for culture of medaka as well as use of this teleost model for reproductive toxicology studies.
UR - http://www.scopus.com/inward/record.url?scp=0032698122&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0032698122&partnerID=8YFLogxK
U2 - 10.1095/biolreprod61.5.1287
DO - 10.1095/biolreprod61.5.1287
M3 - Article
C2 - 10529276
AN - SCOPUS:0032698122
VL - 61
SP - 1287
EP - 1293
JO - Biology of Reproduction
JF - Biology of Reproduction
SN - 0006-3363
IS - 5
ER -