Stress of capture and captivity in kahawai Arripis trutta (Bloch and Schneider) (Perciformes: Arripidae)
1997; Elsevier BV; Volume: 118; Issue: 4 Linguagem: Inglês
10.1016/s0300-9629(97)86806-5
ISSN0300-9629
AutoresGideon Davidson, Helgi Thorarensen, Mark Lokman, Peter S. Davie,
Tópico(s)Fish Ecology and Management Studies
ResumoPlasma cortisol in wild kahawai (Arripis trutta), an active pelagic marine fish, immediately after capture by hook and line was 8 ± 5 ng/ml (capture time, 4.9 ± 0.8 min, range 1–11 min). Capture by angling was accompanied by high levels of lactate in the white muscle (46.6 ± 2.8 μmol/g) and moderate plasma lactate levels (8.4 ± 1.0 mmol/l). Peak plasma cortisol concentration in fish after transport to shore in live tanks aboard a boat (1–2 hr post-capture) was 161 ± 31 ng/ml. Cortisol levels in wild-caught kahawai had returned to basal values within 3 days of introduction to a shore-based holding pool. Kahawai reacted violently to confinement in still water in darkened enclosed boxes. This prompted the design and construction of a swim tunnel for holding individual kahawai. Confinement of chronically cannulated kahawai in the swim tunnel resulted in a progressive increase in plasma cortisol; 2 hr after cannulation and confinement in the swim tunnel, plasma cortisol concentration was 112 ± 31 ng/ml. This increased to 233 ± 55 ng/ml after 2 days of confinement. Thus, confinement and cannulation do not appear to be suitable approaches for studying the physiology of this species.
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