Post-release survival and riverine movements of Gulf of Mexico sturgeon (Acipenser oxyrinchus desotoi Acipenseriformes) following induced spawning
| Autor: | J. D. Holloway, D. E. Colle, Debra J. Murie, Daryl C. Parkyn |
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| Rok vydání: | 2006 |
| Předmět: | |
| Zdroj: | Journal of Applied Ichthyology. 22:1-7 |
| ISSN: | 1439-0426 0175-8659 |
| DOI: | 10.1111/j.1439-0426.2006.00710.x |
| Popis: | Summary Post-release survival and upstream movement of Gulf of Mexico sturgeon (Acipenser oxyrinchus desotoi) in the Suwannee River, Florida, were examined following induced spawning using carp pituitary extract (CPE). Six mature females (one CPE-treated and five control) and 12 mature males (five CPE-treated and seven control) were implanted with ultrasonic tags in March 2001 during their ingress into the Suwannee River. All CPE-treated sturgeon and 10 of the 12 control fish were relocated using ultrasonic telemetry during 4 months following their release, resulting in 100% survival of treated fish and 83% known survival of control fish. Two control fish (one female and one male) could not be relocated after 2 weeks post-release. CPE treatment did not result in mortality but did affect upstream movement behavior, with CPE-treated males moving upstream at a significantly slower rate than control males and females. Similarly, the maximum observed distance that the fish moved upstream differed among control fish (males and females) and treated males, with control fish moving further upstream than CPE-treated males. The rate of upstream movement for the single CPE-treated female was similar to the control females and the maximum upstream distance that this female was located was near a putative spawning area. In general, the environmental parameters of temperature, dissolved oxygen, and conductivity differed over the course of the study but did not differ between treatments and sexes. Treating sturgeon with CPE to induce spawning therefore did not cause mortality but did appear to slow the rate of upstream movement and maximum distance moved in male Gulf sturgeon. |
| Databáze: | OpenAIRE |
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