Gamete Ripening and Hormonal Correlates in Three Strains of Lake Trout
| Autor: | Carl B. Schreck, Neal R. Foster, Daniel V. O'Connor |
|---|---|
| Rok vydání: | 1993 |
| Předmět: |
biology
Ecology media_common.quotation_subject Zoology Aquatic Science biology.organism_classification Trout medicine.anatomical_structure Natural population growth parasitic diseases medicine Sexual maturity Gamete Reproduction Ovulation Ecology Evolution Behavior and Systematics Salmonidae Salvelinus media_common |
| Zdroj: | Transactions of the American Fisheries Society. 122:252-267 |
| ISSN: | 1548-8659 0002-8487 |
| DOI: | 10.1577/1548-8659(1993)122<0252:grahci>2.3.co;2 |
| Popis: | In our 2-year laboratory study of hatchery-reared adult lake trout Salvelinus namaycush of the Seneca Lake, Marquette (Lake Superior Lean), and Jenny Lake strains, we compared gamete ripening times and changes in plasma concentrations of seven hormones. If interstrain differences in these traits were found, such differences might help explain the apparent failure of stocked fish of these strains to develop large, naturally reproducing populations in the Great Lakes. The complex temporal changes in plasma hormone levels that occur during sexual maturation in lake trout have not been previously described. We detected little evidence of temporal isolation that would prevent interbreeding among the three strains. Strain had no effect on ovulation date (OD) in either year. Strain did not affect spermiation onset date (SOD) in year 1 but did in year 2, when the mean SOD of Jenny Lake males was earlier than that of Seneca Lake males but not different from that of Marquette males. Hormonal data were norm... |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Plný text