Surgical removal of a gastric foreign body in a sand tiger shark, Carcharias taurus Rafinesque

Lloyd, Richard E.; Lloyd, Christopher

doi:10.1111/j.1365-2761.2011.01313.x

Cited by 7 publications

(1 citation statement)

References 8 publications

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“…Such complex morphology would suggest that no scales are generated in the early phases of re‐epithelialization; indeed, in experimentally induced 7‐ × 7‐mm dermal wounds in Nurse Sharks Ginglymostoma cirratum and Leopard Sharks Triakis semifasciata , full recovery of the denticles has been noted only after 4 months of healing (Reif 1978). This is in agreement with other reports that, even in uncomplicated experimental wounds in captive sharks, total wound closure and scale replacement was not seen until 3–4 weeks after injury (Reif 1978; Lloyd and Lloyd 2011). Our finding supports observations that denticle regeneration may be delayed significantly, and a hyperplastic and hypertrophic, scale‐less epidermis initially forms at the site of injury.…”

Section: Discussionsupporting

confidence: 93%

Histologic Observations of Dermal Wound Healing in a Free‐Ranging Blacktip Shark from the Southeastern U.S. Atlantic Coast: A Case Report

2020

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Despite indications that sharks have an exceptional capacity to heal from traumatic injuries, no detailed microscopic observations of integumental wounds have been reported for sharks. This study details the histopathological features of such wounds in a freeranging shark. An adult male Blacktip Shark Carcharhinus limbatus was collected in 2017 during fisheries-independent sampling efforts in the coastal southeastern U.S. Atlantic. The shark had numerous lesions on his head, torso, and left pectoral fin that were compatible with shark bites. Representative samples from two wounds on the head were examined by light microscopy. The epidermal changes included hyperplasia and hypertrophy; intracellular edema; and the absence of goblet cells, denticles, and chromatophores. In the dermis, fibrinocellular exudation, granulation tissue, and marked skeletal muscle necrosis and regeneration were observed. The above features were comparable to wound healing in bony fish, albeit minor differences were found. Although this case documents exceptionally good regeneration of skeletal muscle in the shark, we found no evidence of unique morphological healing patterns. Further studies on wound healing are needed because recent molecular and genetic findings do suggest evolutionary adaptations enhancing healing in sharks.

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Section: Discussionsupporting

confidence: 93%