Lab-based evaluation of the reproductive performance of Trojan (M YY ) brook trout ( Salvelinus fontinalis )
Evaluating the efficacy of the use of Trojan male brook trout with two Y chromosomes (M YY ) requires a better understanding of reproductive performance. We measured the reproductive performance of hatchery age-0 and age-1 M YY brook trout compared to hatchery XY males using laboratory crosses. Offs...
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Published in | Canadian journal of fisheries and aquatic sciences Vol. 81; no. 5; pp. 525 - 534 |
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Main Authors | , , , , , , |
Format | Journal Article |
Language | English |
Published |
Ottawa
Canadian Science Publishing NRC Research Press
01.05.2024
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Subjects | |
Online Access | Get full text |
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Summary: | Evaluating the efficacy of the use of Trojan male brook trout with two Y chromosomes (M
YY
) requires a better understanding of reproductive performance. We measured the reproductive performance of hatchery age-0 and age-1 M
YY
brook trout compared to hatchery XY males using laboratory crosses. Offspring of XY males had higher survival than offspring of age-1 M
YY
1-day post-fertilization, but not offspring of age-0 M
YY
. We found no detectable differences in survival from eyed-egg to the juvenile-fry stage. However, size-at-age differed, where offspring of age-0 M
YY
were 3.6% smaller in length and 25.2% smaller in weight than those of XY males. For crosses fertilized by both M
YY
and XY males, we found that a significantly higher proportion of offspring within families were sired by M
YY
versus XY males. These results show, under controlled conditions, evidence for possible fitness advantage for M
YY
under sperm competition, but a possible fitness disadvantage associated with early growth of their offspring. Overall, our results hold promise for the use of M
YY
brook trout to serve as an effective eradication tool. |
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ISSN: | 0706-652X 1205-7533 |
DOI: | 10.1139/cjfas-2023-0245 |