Effects of Ram-Air Ventilation during Transportation on Water Quality and Physiology of Fingerling Walleyes

Autor: James A. Forsberg, Robert C. Summerfelt, Bruce A. Barton
Rok vydání: 1999
Předmět:
Zdroj: North American Journal of Aquaculture. 61:220-229
ISSN: 1548-8454
1522-2055
DOI: 10.1577/1548-8454(1999)061<0220:eoravd>2.0.co;2
Popis: Ram-air ventilation (RAV) of the airspace in a fish hauling tank is achieved by equipping the tank with both forward-facing and rear-facing air scoops. To evaluate the benefits of RAV, we data-logged values every 5-min for dissolved oxygen (O2), pH, and temperature in hauling tanks with and without (control) RAV during a 6-h haul. Levels of CO2 were estimated from the pH–alkalinity relationship. To determine if RAV reduced hauling stress experienced by fingerling walleyes Stizostedion vitreum after a 6-h transport, blood samples were taken for measurement of physiological stress indicators, blood gases, and for assessment of acid–base status. Blood samples were collected before loading (preload), after loading (postload), and at the end of a 6-h trip (posthaul). The mean CO2 for the trip was substantially lower and the pH was higher in water of tanks equipped with RAV compared with water of the control tanks. At posthaul, blood pCO2 (partial pressure of CO2 in the blood) in fish from RAV tanks wa...
Databáze: OpenAIRE
Externí odkaz: