Spotback Skate
| Spotback Skate | |
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Научная классификация 
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| Домен: | Эукариота |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Chondrichthyes |
| Subclass: | Elasmobranchii |
| Superorder: | Batoidea |
| Order: | Rajiformes |
| Family: | Arhynchobatidae |
| Genus: | Atlantoraja |
| Species: | A. castelnaui
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| Binomial name | |
| Atlantoraja castelnaui (A. Miranda-Ribeiro, 1907)
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Скейт на пятно ( Atlantoraja castelnaui ) - это вид рыбы в семействе Arhynchobatidae . Он найден на Атлантических побережьях Аргентины, Бразилии и Уругвая, где его естественная среда обитания находится над континентальным шельфом в открытом море . Это большая рыба, растущая до метра в длину. Он питается в основном на других рыбах в зависимости от доступности, с креветками, осьминогами и другими беспозвоночными также есть. Репродукция происходит в течение большей части года, когда яйца откладываются в капсулы, которые прилипают к морскому дну. Скейт на пятно, который является предметом промысла и, как полагают, их переродится, в результате чего Гринпис добавил рыбу в свой красный список рыб, чтобы избежать, и Международный союз для сохранения природы перечисляет ее как « исчезающие виды ».
Распределение
[ редактировать ]Атлантораджа Кастельнауи встречаются в юго -западном южноатлантическом океане от штата Рио -де -Жанейро в Бразилии до Аргентины. Они предпочитают теплые воды на глубине от 20 до 220 м. [ 2 ] В Аргентине их можно найти в качестве местных жителей аргентинской зоогеографической провинции. Они ищут климат в теплую воду, и часто сообщается, что имеют более южное распределение, чем нормальное по корреляции с более высокими температурами воды. Скейты на понте могут слегка мигрировать или выполнять небольшое периодическое движение назад и движения вперед в зависимости от температуры воды в океане. [3] Тем не менее, не существует заметных сезонных различий для вида, поскольку они заполняют южные воды круглый год.
Although the location of their distribution has not been affected, the quantity of the spotback's distribution has lowered in many places and continues to be threatened by humans fishing in its habitats.[2]
Reproduction
[edit]The length of maturity for males and females differ with males ranging from 185 to 1250 mm in total length and females ranging from 243 to 1368 mm in total length.[4] Males have a continuous production of mature spermatozoa suggests they can reproduce throughout the year but studies have shown higher values in certain months but they are not significant. Females also reproduce year-round with peaks of reproductive activity as well.[4]
Female spotback skates lay their eggs on the ocean floor and leave them there. There is not parental care so the eggs have a capsule that protects the embryo's development once the mother leaves.[5] Collected egg capsules typically are rectangular and have horny process in each corner. They are also shiny and are medium brown in color.[5] The capsules on the eggs are covered by adhesion fibrils that allow the egg to attach itself to the sea floor immediately after the mother releases them. These adhesion fibrils are also seen in other species of skates.[5] The surface of the capsule is striated and presents a rough surface though it is relatively smooth. Atlantoraja castelnaui capsule's are also the largest egg capsule in its genus and compared to other co-occurring species in the same area and depth of the ocean.[5]
Conservation status
[edit]In the cities of Santos and Guarujá, specimens of the spotback skate which are deemed large enough to have commercial value are commonly landed and marketed.[4] From 1999 to present, the market for the meat of the spotback skate has expanded to Asia, particularly South Korea.[4] As a result, commercial fishing has led to an overexploitation of the species and its consequent listing as an endangered species.
Spotback skates are particularly vulnerable to extinction[6] due to their large body size relative to other skate species. According to Dulvy & Reynolds (2002), skate species considered to be locally extinct have larger body sizes compared to all other skates.[4] Large body size is in turn correlated with higher mortality rates and with life-history parameters such as late age at maturity.[4] Another study by García et al. (2007) also corroborated the notion that a large body size increased the extinction risk in elasmobranchs.[4] Spotback skates are also especially vulnerable to trawl fisheries because they inhabit the soft bottom substrates of the ocean (Ebert; Sulikowski, 2007).[7] Consequently, the biomass of spotback skates has decreased by 75% from 1994 to 1999.[1][7]
Behavior and eating habits
[edit]The spotback skate is found across most of the continental shelf year round.[6] The spotback skate's diet is a versatile and mainly piscivorous consumer. Their diet shifts with increasing body size and as a response to seasonal and regional changes in prey abundance and distribution. They prey mostly on teleost, cephalopods, elasmobranchs, and decapods. Smaller spotback skate tend to consume decapods and the larger skates eat elasmobranchs and cephalopods.[8] The consumption of teleosts differed between seasons depending on whether the teleost were demersal- benthic or benthic. The more demersal- benthic teleosts were consumed during the cold season while the benthic teleosts were eaten during the warm season.[8] The decapods, cephalopods and elasmobranchs were predominantly shrimps, octopuses, and skates. The main cephalopod consumed in the warm season was the octopus.[7]
Parasites
[edit]
Like all fish species, spotback skates have a variety of parasites; these include copepods,[9] nematodes[10] and Myxozoans.[11]
Sustainable consumption
[edit]In 2010, Greenpeace International has added the spotback skate to its seafood red list. "The Greenpeace International seafood red list is a list of fish that are commonly sold in supermarkets around the world, and which have a very high risk of being sourced from unsustainable fisheries."[12]
References
[edit]- ^ Jump up to: a b Pollom, R.; Barreto, R.; Charvet, P.; Chiaramonte, G.E.; Cuevas, J.M.; Faria, V.; Herman, K.; Motta, F.; Paesch, L.; Rincon, G. (2020). "Atlantoraja castelnaui". IUCN Red List of Threatened Species. 2020: e.T44575A152015479. doi:10.2305/IUCN.UK.2020-3.RLTS.T44575A152015479.en. Retrieved 18 November 2021.
- ^ Jump up to: a b Oddone, Maria Cristine (28 October 2015). "Length-weight relationships, condition and population structure of the genus Atlantoraja (Elasmobranchii, Rajidae, Arhynchobatinae) in Southeastern Brazilian waters, SW Atlantic Ocean" (PDF). Journal of Northwest Atlantic Fishery Science. 38: 43–52. doi:10.2960/J.v38.m599. Retrieved 29 October 2015.
- ^ Bovcon, N. D.; Cochia, P. D.; Góngora, M. E.; Gosztonyi, A. E. (2011). "New records of warm-temperate water fishes in central Patagonian coastal waters (Southwestern South Atlantic Ocean)". Journal of Applied Ichthyology. 27 (3): 832–839. doi:10.1111/j.1439-0426.2010.01594.x.
- ^ Jump up to: a b c d e f g Oddone, María C.; Amorim, Alberto F.; Mancini, Patricia L. (2008). "Reproductive biology of the spotback skate, Atlantoraja castelnaui (Ribeiro, 1907) (Chondrichthyes, Rajidae), in southeastern Brazilian waters" (PDF). Revista de Biología Marina y Oceanografía. 43 (2): 327–334. doi:10.4067/S0718-19572008000200010.
- ^ Jump up to: a b c d Oddone, Maria C. (2008). "Description of the egg capsule of Atlantoraja castelnaui (Elasmobranchii, Rajidae)". Brazilian Journal of Oceanography. 56 (1): 65–68. doi:10.1590/S1679-87592008000100007. hdl:11449/26939.
- ^ Jump up to: a b Barbini, Santiago A.; Lucifora, Luis O. (2012). "Feeding habits of a large endangered skate from the south-west Atlantic: the spotback skate, Atlantoraja castelnaui". Marine and Freshwater Research. 63 (2): 180–188. doi:10.1071/MF11170.
- ^ Jump up to: a b c Orlando, Luis; Pereyra, Ines; Paesch, Laura; Norbis, Walter (December 2011). "Size and sex composition of two species of the genus Atlantoraja (Elasmobranchii, Rajidae) caught by the bottom trawl fisheries operating on the Uruguayan continental shelf (southwestern Atlantic Ocean)". Brazilian Journal of Oceanography. 59 (4): 357–364. doi:10.1590/S1679-87592011000400006.
- ^ Jump up to: a b Barbini, S. A.; Scenna, L. B.; Figueroa, D. E.; Díaz de Astarloa, J. M. (1 July 2013). "Effects of intrinsic and extrinsic factors on the diet of Bathyraja macloviana, a benthophagous skate". Journal of Fish Biology. 83 (1): 156–169. doi:10.1111/jfb.12159. ISSN 1095-8649. PMID 23808698.
- ^ Irigoitia, Manuel M.; Cantatore, Delfina M.P.; Incorvaia, Inés S.; Timi, Juan T. (2016). "Parasitic copepods infesting the olfactory sacs of skates from the southwestern Atlantic with the description of a new species of Kroeyerina Wilson, 1932". Zootaxa. 4174 (1): 137–152. doi:10.11646/zootaxa.4174.1.10. hdl:11336/64635. ISSN 1175-5334. PMID 27811793.
- ^ Irigoitia, Manuel Marcial; Braicovich, Paola Elizabeth; Lanfranchi, Ana Laura; Farber, Marisa Diana; Timi, Juan Tomás (2018). "Distribution of anisakid nematodes parasitizing rajiform skates under commercial exploitation in the Southwestern Atlantic". International Journal of Food Microbiology. 267: 20–28. doi:10.1016/j.ijfoodmicro.2017.12.009. hdl:11336/86798. ISSN 0168-1605. PMID 29277002.
- ^ Кантаторе, Дельфина Мария Пуула; Ириготия, Мануэль Марсиал; Хольцер, Астрид Сибилле; Бартошова-Суркова, Павла; Пеккова, Ханна; Палиа, Иван; Тими, Джон Томас (2018). «Описание двух новых видов хлормиксума из коньков в аргентинском море показывает, что ограниченное географическое распределение хозяина вызывает филогенетическое разделение миксозоанов в хондрихтисах» . Боссовый . 25 : doi : 47. ISSN 1776-1042 . PMC 6134877 . PMID 30207267 .
- ^ Гринпис международный список морепродуктов
