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  • Title: Differences in concentrations of plasma cortisol in the trout and the eel following adaptation to black or white backgrounds.
    Author: Baker BI, Rance TA.
    Journal: J Endocrinol; 1981 Apr; 89(1):135-40. PubMed ID: 7217835.
    Abstract:
    When rainbow trout (Salmo gairdneri) and eels (Anguilla anguilla) were kept in black tanks for 3-4 weeks, their plasma cortisol titres were about fourfold higher tha in fish kept in white tanks. In trout, the difference was apparent only under a long photoperiod of 16 h light: 8 h darkness, but in eels the difference was clear under both a long or short photoperiod (9.5 h light: 14.5 darkness). It is suggested that the increase in plasma cortisol seen in black-adapted fish is dependent on either ACTH or MSH secreted by the pars intermedia melanotrophs. No difference was seen in the total cortisol-binding capacity of the plasma nor in interrenal histology in trout from black or white backgrounds.
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