“…These physiological indicators have been measured in a range of fish species to evaluate the trauma inflicted on fish by various stressors (Mazeaud et al 1977;Giesy et al 1988;Folmar, 1993;Pickering, 1993a,b). Identifying stress responses can be achieved by determining the changes in plasma catecholamines (Mazeaud et al 1977;Mazeaud and Mazeaud, 1981;Barton, 1988;Tang and Boutilier, 1988;Gingerich and Drottar, 1989;Aota et al 1990) and plasma corticosteroids (Donaldson, 1981;Sumpter et al 1986;Thomas and Rice, 1987;Pickering and Pottinger, 1989;Whitehead and Brown 1989;Waring et al 1992;Foo and Lam, 1993;Mazur and Iwama, 1993;AlKindi et al 1996). These primary (endocrine) responses to stress are more immediate than the induced secondary (metabolic) responses (Barton and Toth, 1980;Mazeaud and Mazeaud, 1981).…”