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Response of juvenile tench Tinca tinca (L.) to the anaesthetic 2-phenoxyethanol

2003; Wiley; Volume: 19; Issue: 3 Linguagem: Inglês

10.1046/j.1439-0426.2003.00460.x

1439-0426

L. Myszkowski, Rafał Kamiński, Jacek Wolnicki,

Aquaculture Nutrition and Growth

The response of tench Tinca tinca aged 40–171 days post-hatch (22–49 mm TL) to the anaesthetic 2-phenoxyethanol was studied at 25°C. The lowest effective concentration of 2-phenoxyethanol increased with age, while the highest safe concentration decreased. The fish aged 40 days post-hatch required a significantly (P ≤ 0.05) shorter time to become anaesthetized than did older fish. The recovery time after 15 min of exposure to 2-phenoxyethanol at 0.45 g dm−3 was significantly shorter in the 40-day-old fish than in older fish. In juveniles of the same age, induction time or recovery time did not depend on their size or condition (Fulton's coefficient). At 25°C, 2-phenoxyethanol at 0.5 g dm−3 may be used to efficiently and safely anaesthetize T. tinca juveniles.