Abstract
Abstract Pathological tissue changes elicited by an internal anchor tag in spot Leiostomus xanthurus and spotted seatrout Cynoscion nebulosus were evaluated histologically. Forty-five spot (32 tagged fish and 13 untagged controls) and 13 tagged spotted seatrout were sampled periodically from 4 h to 4 months posttagging. Early tissue changes (4 h-4 d posttagging) in both species were characterized by acute inflammation and irritation. Changes included hemorrhage, fibrin exudation, extravasation of leukocytes, epidermal hyperplasia and spongiosis, and necrosis in exposed myotomes. Tags were progressively encapsulated and sequestered by fibrogranulation tissue in a similar sequence in both species, commencing with deposition and organization of fibrin at the tag surface. This early fibrinous capsule (at day 2) was infiltrated by leukocytes and fibroblasts, and by day 4–7 it was thickened, highly cellular, and well vascularized. Deposition of collagen within the granulation tissue capsule increased progressiv...
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