Abstract
In comparison with normal rainbow trout, considerable reduction of number was observed in the dermal melanophores of its “cobalt” variant, which is devoid of normal pituitary gland and has only pituitary remnant, detached from or adherent to the base of the brain. Furthermore, in the “cobalt” variant remarkable reduction of number was detectable in the renal melanincontaining cells, which are abundantly present in the renal interstitial tissue of normal rainbow trout. This suggests that pituitary gland has an important role in the cell proliferation and melanin synthesis, not only in the dermal melanophores, but also in the renal melanin-containing cells of rainbow trout.
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