Advisor

Dibble, Eric

Committee Member

Schramm, Hal

Committee Member

Allen, Peter

Date of Degree

1-1-2012

Document Type

Graduate Thesis - Open Access

Abstract

The alligator gar Atractosteus spatula is a euryhaline fish found in the Gulf of Mexico and surrounding drainages. However, the extent of its hypo-osmotic abilities are not well understood. To determine effect of salinity on growth, metabolic rate, and osmoregulation abilities the following question was developed: when does the alligator gar have the osmoregulatory capabilities to survive in hyperosmotic environments? To answer this question, two different age groups (60 and 330 days after hatch [DAH]) of juvenile alligator gar were exposed to 4 different salinities (0, 8, 16, and 24 ppt) for a 30-day period. Specific growth rate, oxygen consumption rate, plasma osmolality, plasma ion concentrations, tissue Na+, K+-ATPase activities, and drinking rate were measured. I determined that the 60 DAH alligator gar had a greater ability to grow and regulate ions than did the 330 DAH alligator gar in increased salinity.

URI

https://hdl.handle.net/11668/17952

Share

COinS