A stranded nice white shark was reported in Die Dam space close to Gansbaai on Monday, 20 June. The sud-adult feminine was lifeless and retrieved by Marine Dynamics Academy (MDA).
She was rolled right into a trawl web and transported again to the Worldwide Marine Volunteers lodge in Kleinbaai to be necropsied by senior white shark biologist Alison Towner and the MDA group the next day.
Detailed photogrammetry and measurements had been taken by conservationists Alina Pryazhkina and Ettienne Roets, along with volunteers from the MDA.
The two.9-metre-long shark was torn open on the pectoral girdle and had what seemed to be killer whale tooth impressions seen on the caudal fin, and it had a Domier dart head from an previous acoustic tag imbedded within the musculature on the left facet of its dorsal fin base.
Towner suspects this to be an animal they tagged in Mossel Bay two years in the past, however as a result of degraded situation of the dorsal fin, and full lack of tag or tether, it isn’t doable to confirm. The flesh was eliminated and inspected containing the dart head and no indicators of lesions, or muscle harm was evident, the wound had totally healed across the tag in a round form, walling it off and supporting the very fact it was an older tag that had seemingly fallen off with time.
Swabs for genetic materials had been taken above and beneath the pectoral tear harm and the doable raker marks on the caudal fin, in addition to two management websites on the physique and had been frozen.
On reducing the ventral flesh open, the shark’s liver and the guts had been confirmed to be lacking. The abdomen contents contained one subadult Cape fur seal. It had seemingly been freshly consumed resulting from little or no decomposition and had been bitten in two, on the hind flippers. The shark’s inner organs all appeared comparatively wholesome, aside from one small fleshy lesion on the cloaca.
The shark’s head was frozen will collected by authorities’s DFFE together with all different samples, and distributed to permitted white shark researchers.
The conclusion on this specific animal’s demise was predation by killer whales, based mostly on the time of 12 months, the kinds of accidents and the truth that the recognized killer whale pair Port and Starboard – confirmed to predate on giant sharks in South Africa – had been within the area two days earlier than. That is the eighth white shark confirmed to have died resulting from killer whale predation in South Africa. The actual quantity is probably going increased as not all carcasses will wash ashore.
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Dyer Island Conservation Belief
Footage: Dyer Island Conservation Belief
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