|Scientific Name:||Elops hawaiensis|
|Species Authority:||Regan, 1909|
Elops machnata and E. hawaiensis occur sympatrically in the Western Pacific and possibly the Hawaiian Islands, so further research appears warranted. In Japan, for example, Sato and Yasuda (1980) claim that E. machnata historically reported in the region are misidentifications of E. hawaiensis. Wang et al. (2002) state that genetic data are now available to discriminate between E. machnata and E. hawaiensis.
|Red List Category & Criteria:||Data Deficient ver 3.1|
|Assessor/s:||Adams, A., Guindon, K., Horodysky, A., MacDonald, T., McBride, R., Shenker, J. & Ward, R.|
|Reviewer/s:||Harwell, H. & Raynal, M.|
This species occurs throughout the Indo-West Pacific; from the Andaman Sea east to Hawaii and Tuamotu Archipelago, north to southern Japan, south to northwestern Australia, New South Wales and New Caledonia. Its current population status is unknown. Minor commercial landings by spearing have been reported in Hawaii, and it is targeted by recreational anglers throughout its range. There is a paucity of fisheries information throughout much of its range. Elops hawaiensis utilizes estuarine areas and hyper-saline lagoons; changes in the the quality of this habitat may affect this species' population dynamics. Although this species is not closely associated with any single habitat, it may be adversely affected by urbanization. A number of questions remain regarding its taxonomic uncertainty, population status, fisheries interactions and potential threats throughout its range. Therefore, it is listed as Data Deficient. Future monitoring is needed, particularly in the Coral Triangle, where significant declines in other Elopiformes have been inferred.
|Range Description:||This species occurs throughout the eastern Indo-West Pacific; from the Andaman Sea east to Hawaii and Tuamotu Archipelago, north to southern Japan, south to northwestern Australia, New South Wales and New Caledonia (Eschmeyer and Fong 2008).|
Native:American Samoa (American Samoa); Australia; Cambodia; China; Cook Islands; Fiji; French Polynesia; Guam; India (Andaman Is., Nicobar Is.); Indonesia; Japan; Kiribati; Malaysia; Marshall Islands; Micronesia, Federated States of ; Myanmar; Nauru; New Caledonia; Niue; Northern Mariana Islands; Palau; Papua New Guinea; Philippines; Samoa; Singapore; Solomon Islands; Taiwan, Province of China; Thailand; Tokelau; Tonga; Tuvalu; United States (Hawaiian Is.); United States Minor Outlying Islands (Howland-Baker Is., Johnston I., Wake Is.); Vanuatu; Viet Nam; Wallis and Futuna
|FAO Marine Fishing Areas:||
Indian Ocean – eastern; Pacific – eastern central; Pacific – northwest; Pacific – southwest; Pacific – western central
|Range Map:||Click here to open the map viewer and explore range.|
|Population:||There are numerous museum records for this species (more than 120 specimens) (accessed through the Fishnet2 Portal, www.fishnet2.net, 2011-05-14). The population status of this species is unknown.|
|Habitat and Ecology:||
This is a coastal fish, commonly entering lagoon, bays, and estuaries (Allen 1991, Mundy 2005), particularly around mangroves (Allen et al. 2002). This species sometimes enters freshwater streams, but does not penetrate very far inland (Allen 1991). Younger fish, in particular, often penetrate the lower freshwater reaches of rivers (Sato and Yasuda 1980, Allen et al. 2002). Elops hawaiensis is an active swimmer, commonly travelling in schools in open water. It feeds on various fishes and crustaceans. Little detailed knowledge exists of its biology. Spawning presumably takes place offshore and young larvae are found in the open sea, moving close to shore as they develop. Juveniles are commonly found in salt marshes, canals, and tidal streams (Smith 1997). It is found at depths of 1–30 m and can grow up to 1.2 m (SL) in length.
Elops hawaiensis was collected as leptocephalus larvae in ten months out of the year in the Tanshui River, Taiwan (Tzeng and Wang (1992). They were collected from mesohaline to polyhaline habitats. Tzeng and Teng (2005) found two main recruitment season in spring and summer in northern Taiwan. Abrantes and Sheaves (2010) report the utilization of upstream wetland habitat by this species.
Hiatt (1947) examined E. hawaiensis (called E. machnata) and found it to be primarily carnivorous, eating fish and shrimp. There was some indication of prey size positively related to predator size. Hundreds of E. hawaiensis leptocephalus larvae were caught in three of four estuaries on the west coast of Taiwan (Tzeng et al. 2002). Doupe et al. (2005) observed this species in Ord River in the northern territories of Australia. Fujita et al. (2002) collected E. hawaiensis in the Shimanto Estuary, Japan; sizes ranged from 27 to 37 mm TL.
Minor commercial landings by spearing have been reported in Hawaii (Smith 1993). This species is targeted by recreational anglers throughout its range. There is a paucity of fisheries information throughout much of its range.
Elops hawaiensis utilizes estuarine areas and hyper-saline lagoons; changes in the the quality of this habitat may affect this species' population dynamics. Since this species may be closely associated with mangroves, it may be adversely affected by urbanization.
|Conservation Actions:||There are no species-specific conservation measures in place for this species. Its distribution overlaps with marine reserves in parts of its range.|
Abrantes, K. and Sheaves, M. 2010. Importance of freshwater flow in terrestrial–aquatic energetic connectivity in intermittently connected estuaries of tropical Australia. Marine Biology 157: 2071-2086.
Allen, G.R. 1991. Field guide to the freshwater fishes of New Guinea. Christensen Research Institute, Madang, Papua New Guinea.
Allen, G.R., Midgley, S.H. and Allen, M. 2002. Field guide to the Freshwater Fishes of Australia. Western Australian Museum, Perth.
Bond, S., Jr. and Gmirkin, R. 2003. Restoring a part of Hawai'i's past: Kaloko fishpond restoration. Ecological Restoration 21: 284-289.
Doupe, R.G., Morgan, D.L. and Gilu, H.S. 2005. Prospects for a restorative fishery enhancement of Lake Kununurra: a high-level tropical impoundment on the Ord River, Western Australia. Pacific Conservation Biology 11: 136-146.
Eschmeyer, W.N. and Fong, J.D. 2008. Species by Family/subfamily in the Catalog of Fishes . Available at: http://research.calacademy.org/research/ichthyology/catalog/SpeciesByFamily.asp. (Accessed: March 29, 2011).
Fujita, S., Kinoshita, I., Takahashi, I. and Azuma, K. 2002. Species composition and seasonal occurrence of fish larvae and juveniles in the Shimanto Estuary, Japan. Fisheries Science 68: 364-370.
Hiatt, R.W. 1947. Food-chains and the food cycle in Hawaiian fish ponds.-Part I. The food and feeding habits of mullet (Mugil cephalus), milkfish (Chanos chanos), and the ten-pounder (Elops machnata). Transactions of the American Fisheries Society 74: 250-261.
IUCN. 2012. IUCN Red List of Threatened Species (ver. 2012.2). Available at: http://www.iucnredlist.org. (Accessed: 17 October 2012).
Kikuchi, W.K. 1976. Prehistoric Hawaiian fishponds. Science 193: 295-299.
Mundy, B.C. 2005. Checklist of the fishes of the Hawaiian Archipelago. Bishop Museum Bulletins in Zoology..
Sato, M. and Yasuda, F. 1980. Metamorphosis of the leptocephali of the ten-pounder, Elops hawaiensis, from Ishigaki Island, Japan. Japanese Journal of Ichthyology 26: 315-324.
Smith, D.G. 1997. Elopidae. Ladyfishes, tenpounders. In: K.E. Carpenter and V.H. Niem (eds), FAO species identification guide for fishery purposes. The living marine resources of the Western Central Pacific. Vol. 3. Batoid fishes, chimaeras and bony fishes part 1 (Elopidae to Linophrynidae)., pp. 1619-1620. Food and Agriculture Organizations of the United Nations, Rome.
Smith, M.K. 1993. An ecological perspective on inshore fisheries in the main Hawaiian Islands. Marine Fisheries Review 55: 34-49.
Tzeng, W. and Wang, Y. 1992. Structure, composition, and seasonal dynamics of the larval and juvenile fish community in the mangrove estuary of Tanshui River, Taiwan. Marine Biology 113: 481-490.
Tzeng, W.N., Wang, Y. and Chang, C. 2002. Spatial and temporal variations of the estuarine larval fish community on the west coast of Taiwan. Marine and Freshwater Research 53: 419-430.
|Citation:||Adams, A., Guindon, K., Horodysky, A., MacDonald, T., McBride, R., Shenker, J. & Ward, R. 2012. Elops hawaiensis. In: IUCN 2013. IUCN Red List of Threatened Species. Version 2013.2. <www.iucnredlist.org>. Downloaded on 05 December 2013.|
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