We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
Effects of Randomly Fired Underwater Currents as an Occupational Enrichment Program in Rainbow Trout (Oncorhynchus mykiss).
- Authors
Villarroel, Morris; Miranda-de la Lama, Genaro C.; Bermejo-Poza, Rubén; Pérez, Concepción; González-de Chávarri, Elisabet; Torrent, Fernando; De la Fuente, Jesús
- Abstract
Occupational enrichment (OE) is directed at introducing variations in the tank water so that fish can exercise as they do in the wild. Two trials were carried out to test the effects of randomly fired underwater currents (RFC) on rainbow trout (Oncorhynchus mykiss) maintained in tanks in a recirculation system, using 1226 trout distributed in two independent trials. In Trial 1, fingerling trout (n = 6 tanks, n = 40 fish per tank) were classified into two groups based on low (13%) or high (30%) coefficient of variation in live weight (CV), and exposed to RFC or no currents (controls). In Trial 2, adult trout (n = 12 tanks, n = 20 fish per tank) were either exposed to RFC or to a constant current (controls) from two submerged pumps. Both trials lasted four weeks. No significant differences in growth were observed between treatments in either trial. In Trial 1, RFC fish maintained a similar CV throughout the trial, while CV decreased in controls. Also, in Trial 1, plasma cortisol levels were higher and creatine phosphokinase (CPK) levels lower in tanks with a low initial CV. In Trial 2, the CV was lower in RFC trout, where cortisol levels were also significantly lower and triglycerides significantly higher. The results suggest that OE using RFC can have positive effects by helping to reduce stress levels, and provides fish with biologically meaningful environmental enrichment related to the natural history of the species.
- Subjects
RAINBOW trout; CREATINE kinase; RETRIEVAL practice; HYDROCORTISONE; TROUT; ADULTS
- Publication
Water (20734441), 2021, Vol 13, Issue 21, p3057
- ISSN
2073-4441
- Publication type
Article
- DOI
10.3390/w13213057