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Diseases and Parasites

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Anisakis Disease (juvenile). Parasitic infestations (protozoa, worms, etc.)
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Recorder
Allan Palacio
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Diseases and Parasites

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Philometra Infestation 1. Parasitic infestations (protozoa, worms, etc.)
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Diseases and Parasites

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Cucullanus Disease. Parasitic infestations (protozoa, worms, etc.)
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Diseases and Parasites

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Diphtherostomum Disease. Parasitic infestations (protozoa, worms, etc.)
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Diseases and Parasites

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Lamellodiscus Infestation. Parasitic infestations (protozoa, worms, etc.)
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Diseases and Parasites

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Choricotyle Infestation 2. Parasitic infestations (protozoa, worms, etc.)
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Diseases and Parasites

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Bivagina Infestation. Parasitic infestations (protozoa, worms, etc.)
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Diseases and Parasites

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Proctoeces Disease. Parasitic infestations (protozoa, worms, etc.)
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Diseases and Parasites

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Unicolax Infestation. Parasitic infestations (protozoa, worms, etc.)
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Life Cycle

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Mature adults form large schools in preferred spawning areas (Ref. 6390). They are serial spawners (Ref. 6390). Spawning generally occurs in waters less than 50 m deep (Ref. 6390). They generally only spawn when water temp is equal to 18°C (Ref. 6390).There have been no investigations of sex reversals in Australian snapper populations. However, in New Zealand, some juvenile snapper change sex from female to male but all such changes are completed by the onset of maturity (Ref. 28040).
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Susan M. Luna
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Migration

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Oceanodromous. Migrating within oceans typically between spawning and different feeding areas, as tunas do. Migrations should be cyclical and predictable and cover more than 100 km.
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Estelita Emily Capuli
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Trophic Strategy

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Found on the continental shelf (Ref. 75154). Juvenile snapper leave the midwater zone to inhabit reefs or rocky outcrops when they are 12 months of age and about 6 cm long (Ref. 6390). They are most abundant in seagrass beds and are also associated with reef and gravel areas (Ref. 30572). As they grow, they move into deeper water and aggregate on near inshore reefs (Ref. 30572). In New Zealand, juvenile snapper (less than 25 cm FL) are caught in water 0-25 m deep (Ref. 30575). In southern Australia, juvniles and post-flexion larvae enter estuaries at floodtides (Ref. 30576).In New South Wales, Victoria and South Australia, the older juveniles and young adults progressively move to coastal and offshore waters and some individuals also migrate substantial distances along the coastline (Ref. 6390).
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Biology

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Inhabit rocky reefs (Ref. 9702). Also occur in estuaries (Ref. 9563). Juveniles mainly inhabit inlets, bays and other shallow, sheltered marine waters, often over mud and seagrass (Ref. 6390). Small fish measuring less than 30 cm TL are common inshore around reef areas often in groups of around 30 individuals. Larger fish are shy and are less frequently seen (Ref. 26966). Adults often live near reefs, but are also found over mud and sand substrates (Ref. 6390). They are relatively sedentary. However, tagging studies have shown them capable of substantial migrations (Ref. 28591). Crustaceans (crabs, shrimps, etc) form the basis of the diet, but marine worms, starfish, sea urchins, shellfish and fish are also important (Ref. 28591). Not commercially cultured at present but considered as a prime aquaculture candidate (Ref. 28590). Maximum estimated age for SW Pacific is 54 years with validated longevity on the order of 40 years based on minimum age from bomb radiocarbon dating (Ref. 92924; Allen Andrews, pers.comm. 01/13). It is parasitised by the monogenean Anoplodiscus cirrusspiralis on the fins and body surface (Ref. 124057).
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Importance

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fisheries: commercial; aquaculture: experimental; gamefish: yes
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Australasian snapper

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The Australasian snapper (Chrysophrys auratus) or silver seabream is a species of porgie found in coastal waters of Australia, Philippines, Indonesia, mainland China, Taiwan, Japan and New Zealand. Its distribution areas in the Northern and Southern Hemispheres are disjunct.[2] Although it is almost universally known in Australia and New Zealand as snapper, it does not belong to the snapper family, Lutjanidae. It is highly prized as an edible fish, with a sweet sea taste and a firm texture.

The species name is Chrysophrys auratus, but previously referred to as Pagrus auratus.[1][2]

Regional variation in naming

Large snapper caught off Frankston, Victoria, in 1893

Australia: cocknies (young smaller than legal size), red bream or pinkies (legal size), squire or squirefish (when bigger), snapper (at full size)

Western Australia: "pink snapper"[3] to distinguish it from unrelated species[4]

Victoria: also schnapper (ref: Schnapper Point, Mornington)

South Australia: the name "ruggers" is often used for smaller fish of legal size

Aboriginal people of the Port Jackson area in Australia: they called it wollamie[5] (also spelt wollamai, and other variations). European colonists there knew it as the "light horseman", for the resemblance of the fish's skull to the helmet of a light horseman.[6]

New Zealand: snapper (or New Zealand snapper when there is need to distinguish from other species of snapper). New Zealand Māori: tāmure (adult fish), karatī (juveniles)[7]

Habitat

Capture of wild Australasian snapper in thousand tonnes, 1950–2010, as reported by the FAO[8]

The Australasian snapper is found on all coasts of New Zealand, especially in the north. In Australia, it is found along the south coast, mainly near Kiama, Berry, Gerringong, Gerroa, Huskisson, Vincentia, and Shoalhaven. It is also found on the coast of Tasmania, but in smaller numbers. The fish spawn in inshore waters and live in rocky areas and reefs of up to 200 m (660 ft) deep. They school, and will migrate between reefs. Larger fish are known to enter estuaries and harbours, for example Port Phillip Bay has a renowned seasonal snapper run.

Growth rates within the wild stocks vary with some (i.e. the Hauraki Gulf, NZ) growing rapidly and to a smaller maximum length, while stocks in east and west Australia are known to grow more slowly. The species is capable of living about 40 years throughout much of its range in Australia, and the Australian recordholder of 40 years and 10 months was a 93.5 cm (36.8 in) large-nosed male, caught on 1 September 2007 off Bunbury, West Australia, and photographed on the day of capture.[9] Sexual maturity is reached at about 30 cm (12 in) long and a small percentage of the males will turn into females at puberty. Large individuals of both sexes develop a prominent hump on the head.[10] Anglers are advised not to take immature fish, so as not to reduce breeding stock. The legal size in Australia varies by state, from 35 cm (14 in) and a bag limit of five fish per person in Queensland to 50 cm (20 in) in Western Australia. During spawning, these fish obtain a metallic green sheen which indicates a high concentration of acid buildup within the scales' infrastructure. Minimum sizes are supposed to be designed to allow these fish to participate in spawning runs at least once before they become available to the fishery, but given the slow growth rates of this species, a need exists to consider area closures and/or further increase the minimum sizes in each state to reduce the chances of growth overfishing of the various populations of snapper throughout its range. This may be important with recent developments in technology such as GPS.

In a human context

Snapper was an important traditional food for Māori, especially the tribes to the north of the North Island, where snapper bones sometimes make up the majority of archaeological middens. Snapper is known by multiple names, including tāmure, a word to describe adults, and karatī, a word describing juvenile fish.[11]

There are numerous traditional ways to prepare the fish. One specific to snapper was kaniwha, where the meat would be submerged in fresh water and squeezed numberous times, then eaten raw. The nene (base of the tongue) was considered the most prestigeous part of the fish to eat.[11]

Fisheries

Aquaculture production of farmed Australasian snapper in thousand tonnes, 1950–2010, as reported by the FAO[8]
Global harvest in thousand tonnes[8]

Catches of Australasian snapper have varied between 25,600 and 34,300 tonnes in 2000–2009, with Japan and New Zealand reporting the largest catches.[12]

See also

References

  1. ^ a b Carpenter, K.E.; Buxton, C.D.; Russell, B.; Pollard, D. (2014). "Pagrus auratus". IUCN Red List of Threatened Species. 2014: e.T154734A47028414. doi:10.2305/IUCN.UK.2014-3.RLTS.T154734A47028414.en. Retrieved 11 November 2021.
  2. ^ a b Froese, Rainer; Pauly, Daniel (eds.) (2012). "Chrysophrys auratus" in FishBase. September 2012 version.
  3. ^ "Relationships among partial and whole lengths and weights for Western Australian Pink Snapper Chrysophrys auratus (Sparidae) - Department of Fisheries, Western Australia, Fish for the Future". Archived from the original on 19 August 2006. Retrieved 2006-07-22.
  4. ^ "Fishing Australia with the Definitive Aussie Interactive Sports Fishing Website! - Sportsfish Australia". Archived from the original on 3 July 2006. Retrieved 2006-07-22.
  5. ^ Australian Aboriginal Words in English, R. M. W. Dixon, Oxford University Press, 1990, ISBN 0-19-553099-3
  6. ^ Matthew Flinders. A Voyage to Terra Australis, volume 1 at Project Gutenberg, entry for 3 May 1802
  7. ^ Snapper, New Zealand's Greatest Fish, Te Ika Rangatira o Aotearoa, Sam Mossman, AUT Media, 2008, ISBN 978-0-9582829-6-3
  8. ^ a b c Based on data sourced from the FishStat database Archived November 7, 2012, at the Wayback Machine
  9. ^ Norriss, J.V.; Crisafulli, B. (2010). "Longevity in Australian Snapper". Journal of the Royal Society of Western Australia. 93: 129–32.
  10. ^ Dianne J. Bray & Martin F. Gomon, 2011, Snapper, Chrysophrys auratus, in Fishes of Australia, accessed 09 Sep 2014, http://www.fishesofaustralia.net.au/home/species/678
  11. ^ a b Vennell, Robert (5 October 2022). Secrets of the Sea: The Story of New Zealand's Native Sea Creatures. HarperCollins Publishers Ltd. pp. 154–159. ISBN 978-1-77554-179-0. Wikidata Q114871191.
  12. ^ FAO (Food and Agriculture Organization of the United Nations) (2011). Yearbook of fishery and aquaculture statistics 2009. Capture production (PDF). Rome: FAO. p. 162. Archived from the original (PDF) on 2017-05-19.
  • Allan, Richard (1990). Australian Fish and How to Catch Them. Landsdowne Publishing. ISBN 1-86302-674-6.
  • "Snapper". An Encyclopaedia of New Zealand. 1966. Retrieved 2006-07-22.

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Australasian snapper: Brief Summary

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The Australasian snapper (Chrysophrys auratus) or silver seabream is a species of porgie found in coastal waters of Australia, Philippines, Indonesia, mainland China, Taiwan, Japan and New Zealand. Its distribution areas in the Northern and Southern Hemispheres are disjunct. Although it is almost universally known in Australia and New Zealand as snapper, it does not belong to the snapper family, Lutjanidae. It is highly prized as an edible fish, with a sweet sea taste and a firm texture.

The species name is Chrysophrys auratus, but previously referred to as Pagrus auratus.

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