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Sharks and Rays of Manukau Harbour

Sharks and Rays of Manukau Harbour. Clinton Duffy Marine Conservation Unit Department of Conservation. Manukau Harbour Technical Symposium, 8 April 2008, ARC. © Paul Morris. Hexanchiformes: Hexanchidae (six and sevengill sharks) Notorhynchus cepedianus broadnose sevengill shark, tuatini

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Sharks and Rays of Manukau Harbour

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  1. Sharks and Rays of Manukau Harbour Clinton Duffy Marine Conservation Unit Department of Conservation Manukau Harbour Technical Symposium, 8 April 2008, ARC © Paul Morris

  2. Hexanchiformes: Hexanchidae (six and sevengill sharks) Notorhynchus cepedianus broadnose sevengill shark, tuatini Squaliformes: Squalidae (spiny dogfishes) Squalus acanthias spotted spiny dogfish, pioke, makohuarau, koinga Squalus griffini ? northern spiny dogfish, pioke, koinga Lamniformes: Alopiidae (thresher sharks) Alopias vulpinus common thresher shark, mango-ripi Lamnidae (macherel sharks) Carcharodon carcharias white shark, white pointer, mango-tuatini Isurus oxyrinchus mako, shortfin mako Carcharhiniformes: Scyliorhinidae (cat sharks) Cephaloscyllium isabellum carpet shark, pekapeka Triakidae (houndsharks) Galeorhinus galeus school shark, greyboy, tope, kapeta, tupere Mustelus lenticulatus rig, spotted dogfish, gummy shark, spotted smoothound, mango Carcharhinidae (requiem sharks, whalers) Carcharhinus brachyurus bronze whaler, toiki, reremai, ngengeru Prionace glauca blue shark, blue whaler, mango-pounamu Sphyrnidae (hammerheads) Sphyrna zygaena smooth hammerhead, mango-pare Myliobatiformes: Torpedinidae (electric rays) Torpedo fairchildi New Zealand electric ray, torpedo Rajidae (skates) Dipturus (Zearaja) nasuta rough skate, whai, waewae Raja innominata smooth skate, whai Dasyatidae (stingrays, stingarees) Dasyatis brevicaudata shorttail stingray, whai, whai-repo, pakaurua, oru, roha Dasyatis thetidis longtail stingray, whai, whai-repo Myliobatidae (eagle rays) Myliobatis tenuicaudatus eagle ray, whai-repo Species List:

  3. Commercial fishery 1989-2007 • Rig/spotted dogfish make up 81% of the reported catch cf. 1.13% for school shark • 98.7% of the rig catch, and 92.8% of the elasmobranch catch is taken by set nets

  4. Commercial target species

  5. Annual set net effort

  6. Seasonal set net effort

  7. Problems with fisheries dependent data

  8. 3.3 m white shark tagged and released in mouth of Papakura Channel, 17 January 2008. Peter Sellers, Counties Manukau Sportfishing Club

  9. Size range 150 cm – 610 cm TL, average length = 303 cm TL (n=35)

  10. Satellite tagging

  11. Is the Manukau as a shark nursery ground? Criteria (Heupel et al. 2007, MEPS Vol. 337: 287–297, 2007): • juvenile sharks are more commonly encountered in the area than elsewhere; • sharks have a tendency to remain in the area or return to it for extended periods; and • the area or habitat is repeatedly used across years.

  12. © Paul Morris

  13. Hurst et al. 2002. NIWA Tech. Report 84

  14. © Paul Morris

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