Appropriate fertilization practices play a crucial role in the maintenance of genetic diversity w... more Appropriate fertilization practices play a crucial role in the maintenance of genetic diversity within captive fish broodstocks. We assessed the influence of in vitro storage of gametes (0-, 7- and 14-days post-stripping) at 1 °C on ovarian fluid pH, sperm motility, and embryo viability in the critically endangered Finnish landlocked salmon (Salmo salar m. sebago) population. A repeated full-factorial design used in both sperm-ovarian fluid activation analyses and fertilizations allowed us to separate the effects of female, male and their interaction on gamete quality and embryo survival across storage times. The ovarian fluid pH decreased most significantly during the first week of storage and showed considerable variation among females. The decrease of sperm motility varied across males, females and male–female (sperm-ovarian fluid) combinations. The mean proportion of viable embryos was initially 96.4%, but dropped to 45.5% after 7 days, and to 13.1% after 14 days of gamete stora...
The landlocked salmon (Salmo salar m. sebago) endemic to Lake Saimaa, Finland, is critically enda... more The landlocked salmon (Salmo salar m. sebago) endemic to Lake Saimaa, Finland, is critically endangered and severely threatened by low genetic diversity and inbreeding. To explore the possibility o...
Certain spawning areas of the critically endangered Lake Saimaa landlocked Atlantic salmon (Salmo... more Certain spawning areas of the critically endangered Lake Saimaa landlocked Atlantic salmon (Salmo salar m. sebago) have been recently restored by excavator- and helicopter-scattered gravel, but the...
The modern theories of sexual selection predict that male sexual ornaments may have evolved as re... more The modern theories of sexual selection predict that male sexual ornaments may have evolved as reliable signals of male fertilization efficiency. However, among the studies of fishes with external fertilization, the results have yielded ambiguous evidence. In the present study, we present data on the phenotypic relationships between red spawning coloration and ejaculate quality (spermatocrit, sperm motility) from Arctic charr, Salvelinus alpinus. We studied two generations (F1 and F2) of males from a large lake population, reared in a standardized hatchery environment, to determine whether differential hatchery history, or duration of hatchery selection, affected the variation in ejaculate characteristics or abdominal coloration. After controlling for body length, there was no difference between the hatchery generations in these traits. However, the degree of redness increased with fish size. We found a positive correlation between sperm velocity and sperm longevity, indicating a fu...
24 The modern theories of sexual selection predict that male sexual ornaments may have evolved 25... more 24 The modern theories of sexual selection predict that male sexual ornaments may have evolved 25 as reliable signals of male fertilization efficiency. However, among the studies of fishes with 26 external fertilisation, the results have yielded ambiguous evidence. Here, we present data on 27 the phenotypic relationships between red spawning coloration and ejaculate quality 28 (spermatocrit, sperm motility) from Arctic charr, Salvelinus alpinus. We studied two 29 generations (F1 and F2) of males from a large lake population, reared in a standardized 30 hatchery environment, to see whether differential hatchery history, or duration of hatchery 31 selection, affected the variation in ejaculate characteristics or abdominal coloration. After 32 controlling for body length, there was no difference between the hatchery generations in these 33 traits. However, the degree of redness increased with fish size. We found a positive 34 correlation between sperm velocity and sperm longevity, indi...
Appropriate fertilization practices play a crucial role in the maintenance of genetic diversity w... more Appropriate fertilization practices play a crucial role in the maintenance of genetic diversity within captive fish broodstocks. We assessed the influence of in vitro storage of gametes (0-, 7- and 14-days post-stripping) at 1 °C on ovarian fluid pH, sperm motility, and embryo viability in the critically endangered Finnish landlocked salmon (Salmo salar m. sebago) population. A repeated full-factorial design used in both sperm-ovarian fluid activation analyses and fertilizations allowed us to separate the effects of female, male and their interaction on gamete quality and embryo survival across storage times. The ovarian fluid pH decreased most significantly during the first week of storage and showed considerable variation among females. The decrease of sperm motility varied across males, females and male–female (sperm-ovarian fluid) combinations. The mean proportion of viable embryos was initially 96.4%, but dropped to 45.5% after 7 days, and to 13.1% after 14 days of gamete stora...
The landlocked salmon (Salmo salar m. sebago) endemic to Lake Saimaa, Finland, is critically enda... more The landlocked salmon (Salmo salar m. sebago) endemic to Lake Saimaa, Finland, is critically endangered and severely threatened by low genetic diversity and inbreeding. To explore the possibility o...
Certain spawning areas of the critically endangered Lake Saimaa landlocked Atlantic salmon (Salmo... more Certain spawning areas of the critically endangered Lake Saimaa landlocked Atlantic salmon (Salmo salar m. sebago) have been recently restored by excavator- and helicopter-scattered gravel, but the...
The modern theories of sexual selection predict that male sexual ornaments may have evolved as re... more The modern theories of sexual selection predict that male sexual ornaments may have evolved as reliable signals of male fertilization efficiency. However, among the studies of fishes with external fertilization, the results have yielded ambiguous evidence. In the present study, we present data on the phenotypic relationships between red spawning coloration and ejaculate quality (spermatocrit, sperm motility) from Arctic charr, Salvelinus alpinus. We studied two generations (F1 and F2) of males from a large lake population, reared in a standardized hatchery environment, to determine whether differential hatchery history, or duration of hatchery selection, affected the variation in ejaculate characteristics or abdominal coloration. After controlling for body length, there was no difference between the hatchery generations in these traits. However, the degree of redness increased with fish size. We found a positive correlation between sperm velocity and sperm longevity, indicating a fu...
24 The modern theories of sexual selection predict that male sexual ornaments may have evolved 25... more 24 The modern theories of sexual selection predict that male sexual ornaments may have evolved 25 as reliable signals of male fertilization efficiency. However, among the studies of fishes with 26 external fertilisation, the results have yielded ambiguous evidence. Here, we present data on 27 the phenotypic relationships between red spawning coloration and ejaculate quality 28 (spermatocrit, sperm motility) from Arctic charr, Salvelinus alpinus. We studied two 29 generations (F1 and F2) of males from a large lake population, reared in a standardized 30 hatchery environment, to see whether differential hatchery history, or duration of hatchery 31 selection, affected the variation in ejaculate characteristics or abdominal coloration. After 32 controlling for body length, there was no difference between the hatchery generations in these 33 traits. However, the degree of redness increased with fish size. We found a positive 34 correlation between sperm velocity and sperm longevity, indi...
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