Multi-year growth progression of a neoplastic lesion on a bull shark (&lt;em&gt;Carcharhinus leucas&lt;/em&gt;)

Brunnschweiler, Juerg M.; Huveneers, Charlie; Borucinska, J D

doi:10.19185/matters.201709000002

Cited by 3 publications

(4 citation statements)

References 18 publications

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“…As a result of the snapshot protocol only three individuals displaying this scar were included in the study, where it was categorized as 'other' because of the unknown nature of its cause. A study by Brunnschweiler, Huveneers, and Borucinska (2017) described a growth on a bull shark of similar description, induced by continual aggravation from lodged fishing gear. A similar lesion has also been observed in a great white shark (Carcharodon carcharias) without the presence of a foreign body (Huveneers et al, 2016;Robbins, Bruce, & Fox, 2014).…”

Section: Discussionmentioning

confidence: 91%

“…Aggregates of inflammatory cells were also noted, as well as the presence of melanomacrophage centres, which are known to develop in association with chronic inflammatory lesions (Agius & Roberts, 2003). The growths may therefore be caused by continuous aggravation of the area, similar to that observed by Brunnschweiler et al (2017). Melanomacrophage centres are known to be focal sites of intracellular bacterial infection, meaning that persistent aggregation of injury could increase the chances of pathogenic bacterial infection in whale sharks (Agius & Roberts, 2003).…”

Section: Discussionmentioning

confidence: 92%

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Scarring patterns of whale sharks, Rhincodon typus, at a provisioning site in the Philippines

Penketh

Schleimer

Labaja

et al. 2020

Aquatic Conservation

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Shark‐based tourism continues to be a rapidly growing industry, and thus understanding the impacts of such activities is essential to mitigate the potential negative effects on the target species. The consequences of provisioning on whale sharks (Rhincodon typus) are not fully understood, although changes to the local environment, ecology, behaviour, and site visitation patterns have been highlighted. Here, the scarring patterns of whale sharks were investigated at a provisioning site in Oslob, Cebu, Philippines, as an indicator of the physical impacts of tourism activities on individual sharks. Photographic identification was used to attribute scars to individual animals (n = 152) between March 31, 2012 and January 31, 2015. Scars were categorized by type and body location, and were compared with non‐provisioned aggregations in Australia, Mozambique, and Seychelles. Oslob whale sharks were more scarred than other studied populations, with 94.7% (n = 144) having at least one scar, and with 90.8% (n = 138) having more than one scar. Scarring incidence was found to be significantly higher in sharks that regularly visited the provisioning site, and analysis of scarring over time in highly resident sharks showed that all individuals gained scars through periods of consistent re‐sightings. A significantly higher incidence of minor scar types was found, most commonly on the dorsal side of the animal, probably resulting from sustained proximity to boats and ropes throughout the provisioning activities. The consequences of interactions with propeller boats were observed, despite a ban on their use in the provisioning site, highlighting the risk to the species beyond the study site. We recommend the strict enforcement of a minimum distance between boats and sharks, a zero‐contact policy during interactions, the expansion of the provisioning site, and the implementation of a no‐boat‐access zone around the perimeter of the provisioning site to mitigate potential collisions.

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Section: Discussionmentioning

confidence: 91%

Section: Discussionmentioning

confidence: 92%

Scarring patterns of whale sharks, Rhincodon typus, at a provisioning site in the Philippines

Penketh

Schleimer

Labaja

et al. 2020

Aquatic Conservation

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“…Furthermore, C. leucas is distributed around the oceanic islands of Melanesia's New Caledonia (fourmanoir & laBoute 1976;fricke & kulBicki 2006fricke & kulBicki , 2007lanGlois et al 2006;maillaud et al 2009;fricke et al 2011;Gauthier et al 2020), Vanuatu (Brunnschweiler 2018a(Brunnschweiler , 2018b, the Solomon Islands (hylton et al 2017), Fiji (e.g. Brunnschweiler 2005Brunnschweiler , 2010Brunnschweiler et al 2014Brunnschweiler et al , 2017Brunnschweiler et al , 2018Brunnschweiler & marosi 2019;Glaus 2019;Glaus et al 2015Glaus et al , 2019aGlaus et al , 2019bGlaus et al , 2020drew & mckeon 2019;ward-PaiGe et al 2020;BouverouX et al 2021), Samoa and American Samoa (wass 1984).…”

Section: Distribution In Melanesia and Polynesiamentioning

confidence: 99%

Synopsis of global fresh and brackish water occurrences of the bull shark Carcharhinus leucas Valenciennes, 1839 (Pisces: Carcharhinidae), with comments on distribution and habitat use

Gausmann¹

2021

Integrative Systematics: Stuttgart Contributions to Natural His

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No. WC Toponym Country (State) References LHS Comments F Neuse River [35.10°N, -76.50°E] USA (NC) schwartz (1995, 1997, 2012); southern fried science (2011); BanGley et al. (2018a, 2018b) Juv Ad Tributary of the Pamlico Sound (No. 9). schwartz (1995) reported C. leucas at New Bern in summer F Cape Fear 14 inteGrative systematics No. WC Toponym Country (State) References LHS Comments F Pearl River-System [30.18°N, -89.57°E]

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“…There are limited reports of histopathological changes in sharks that are related to internal trauma (Borucinska et al 2001, 2002a, 2002b; Adams et al 2015) or integumental injuries ranging from minimal (Manire and Gruber 1991; Heupel and Bennett 1997) to severe (Bird 1978; Bertone et al 1996; Brunnschweiler et al 2017). This case report provides the first detailed description of light‐microscopic features of dermal wounds in a free‐ranging shark.…”

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confidence: 99%

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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Multi-year growth progression of a neoplastic lesion on a bull shark (<em>Carcharhinus leucas</em>)

Cited by 3 publications

References 18 publications

Scarring patterns of whale sharks, Rhincodon typus, at a provisioning site in the Philippines

Scarring patterns of whale sharks, Rhincodon typus, at a provisioning site in the Philippines

Synopsis of global fresh and brackish water occurrences of the bull shark Carcharhinus leucas Valenciennes, 1839 (Pisces: Carcharhinidae), with comments on distribution and habitat use

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

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