Overview

Comprehensive Description

Biology

A common catshark found on the continental shelf, from close inshore down to at least 100 m (Ref. 244, 11230). Interest to fisheries unknown (Ref. 11146). Oviparous (Ref. 50449).
  • Compagno, L.J.V. 1984 FAO Species Catalogue. Vol. 4. Sharks of the world. An annotated and illustrated catalogue of shark species known to date. Part 2 - Carcharhiniformes. FAO Fish. Synop. 125(4/2):251-655. Rome: FAO. (Ref. 244)
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Distribution

Range Description

Northwest and western central Pacific: Japan (Hokkaido and Honshu to okinawa), Korea, China and possibly Philippines (Compagno et al. 2005).
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Western North Pacific.
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Northwest Pacific: Japan and Korea to Taiwan.
  • Compagno, L.J.V. and V.H. Niem 1998 Scyliorhinidae. Catsharks. p. 1279-1292. In K.E. Carpenter and V.H. Niem (eds.) FAO Identification Guide for Fishery Purposes. The Living Marine Resources of the Western Central Pacific. FAO, Rome. (Ref. 11146)
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Physical Description

Morphology

Dorsal spines (total): 0; Dorsal soft rays (total): 0; Analspines: 0; Analsoft rays: 0
  • Compagno, L.J.V. and V.H. Niem 1998 Scyliorhinidae. Catsharks. p. 1279-1292. In K.E. Carpenter and V.H. Niem (eds.) FAO Identification Guide for Fishery Purposes. The Living Marine Resources of the Western Central Pacific. FAO, Rome. (Ref. 11146)
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Size

Maximum size: 500 mm TL
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Max. size

50.0 cm TL (male/unsexed; (Ref. 559))
  • Masuda, H., K. Amaoka, C. Araga, T. Uyeno and T. Yoshino 1984 The fishes of the Japanese Archipelago. Vol. 1. Tokai University Press, Tokyo, Japan. 437 p. (text). (Ref. 559)
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Diagnostic Description

6 to 9 distinct dusky saddle marks, interspersed with dark and light spots; fins plain (Ref. 11146).
  • Compagno, L.J.V. and V.H. Niem 1998 Scyliorhinidae. Catsharks. p. 1279-1292. In K.E. Carpenter and V.H. Niem (eds.) FAO Identification Guide for Fishery Purposes. The Living Marine Resources of the Western Central Pacific. FAO, Rome. (Ref. 11146)
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Ecology

Habitat

Habitat and Ecology

Habitat and Ecology
Found close inshore to depths of at least 320 m on the continental shelf and upper slopes. Reproduction is oviparous. This species is at least 8 cm long when hatched and grows to a maximum length of 48 cm, with males maturing at 41-48 cm and females maturing at 39 cm and above (Horie and Tanaka 2002, Compagno et al. 2005). Further biological data is available from Horie and Tanaka (2002): Size at sexual maturity appears to increase with declining water temperature (Horie and Tanaka 2002).

Systems
  • Marine
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Depth: 0 - 100m.
Recorded at 100 meters.

Habitat: demersal.
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Environment

demersal; marine; depth range ? - 100 m (Ref. 11146)
  • Compagno, L.J.V. and V.H. Niem 1998 Scyliorhinidae. Catsharks. p. 1279-1292. In K.E. Carpenter and V.H. Niem (eds.) FAO Identification Guide for Fishery Purposes. The Living Marine Resources of the Western Central Pacific. FAO, Rome. (Ref. 11146)
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Depth range based on 106 specimens in 1 taxon.
Water temperature and chemistry ranges based on 60 samples.

Environmental ranges
  Depth range (m): 86 - 490
  Temperature range (°C): 6.409 - 12.060
  Nitrate (umol/L): 16.734 - 26.044
  Salinity (PPS): 34.440 - 35.062
  Oxygen (ml/l): 3.111 - 4.926
  Phosphate (umol/l): 1.108 - 2.172
  Silicate (umol/l): 9.858 - 21.799

Graphical representation

Depth range (m): 86 - 490

Temperature range (°C): 6.409 - 12.060

Nitrate (umol/L): 16.734 - 26.044

Salinity (PPS): 34.440 - 35.062

Oxygen (ml/l): 3.111 - 4.926

Phosphate (umol/l): 1.108 - 2.172

Silicate (umol/l): 9.858 - 21.799
 
Note: this information has not been validated. Check this *note*. Your feedback is most welcome.

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Trophic Strategy

A small species, lives in rocky regions. A carnivor (Ref. 9137).
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Life History and Behavior

Life Cycle

Oviparous, with only one egg laid per oviduct at a time (Ref. 244). Embryos feed solely on yolk (Ref. 50449). Size at hatching at least 8 cm (Ref. 244).During courtship and prior to copulation, the male bites and wraps the female's pectoral fin, body, tail, and gills (Ref. 49562, 51119). Copulation is initiated when the male inserts one of its claspers into the female's cloaca. The whole mating episode lasts from 15 seconds to 4 minutes (Ref. 49562).
  • Breder, C.M. and D.E. Rosen 1966 Modes of reproduction in fishes. T.F.H. Publications, Neptune City, New Jersey. 941 p. (Ref. 205)
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Molecular Biology and Genetics

Molecular Biology

Barcode data: Scyliorhinus torazame

The following is a representative barcode sequence, the centroid of all available sequences for this species.


There are 2 barcode sequences available from BOLD and GenBank.

Below is a sequence of the barcode region Cytochrome oxidase subunit 1 (COI or COX1) from a member of the species.

See the BOLD taxonomy browser for more complete information about this specimen and other sequences.

ACCCTATATTTAATCTTTGGTGCATGAGCAGGCATAGTTGGGACAGCTTTA---AGTCTTCTTATCCGAGCTGAACTCGGGCAACCAGGTTCACTCTTGGGTGAT---GATCAGATTTATAATGTAATCGTAACAGCCCATGCCTTTGTAATAATTTTCTTTATAGTTATGCCAGTAATAATCGGTGGGTTTGGAAACTGATTAGTACCATTAATG---ATTGGTGCACCAGATATAGCTTTTCCTCGTATAAATAATATAAGCTTTTGACTACTTCCTCCTTCCTTCCTTCTTCTACTGGCTTCAGCTGGAGTAGAAGCTGGTGCAGGGACTGGATGAACAGTTTACCCCCCATTAGCTGGTAATATAGCCCATGCCGGAGCATCCGTTGATTTA---ACCATCTTCTCTCTTCACTTAGCTGGCATTTCATCAATTTTAGCCTCAATTAACTTTATTACAACTATTATTAATATAAAACCCCCAGCTGTTTCACAATACCAAACTCCCTTATTTGTATGATCTATTCTTGTAACAACTGTTCTTCTTCTTCTATCTCTCCCTGTCCTTGCAGCC---GGCATTACAATGCTATTAACAGACCGAAATCTTAATACAACATTCTTTGATCCTGCAGGGGGCGGAGACCCAATTCTTTATCAGCATTTA
-- end --

Download FASTA File

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Statistics of barcoding coverage: Scyliorhinus torazame

Barcode of Life Data Systems (BOLDS) Stats
Public Records: 5
Specimens with Barcodes: 5
Species With Barcodes: 1
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Conservation

Conservation Status

IUCN Red List Assessment


Red List Category
LC
Least Concern

Red List Criteria

Version
3.1

Year Assessed
2009

Assessor/s
Nakaya, K., Tanaka, S. & Iglésias, S.

Reviewer/s
Stevens, J.D., Valenti, S.V. & Fowler, S.L. (Shark Red List Authority)

Contributor/s

Justification
A locally abundant catshark, found from Japan (Hokkaido and Honshu to Okinawa), Korea, China and possibly Philippines. Little is known of the biology but this is a relatively small oviparous species and may therefore be more productive than larger live-bearing sharks. Although no data are available to assess population trends, the species is apparently still abundant in areas that are heavily fished by trawlers. Other small scyliorhinid species have proven resilient to population decline, even where they are heavily fished (for example Scyliorhinus canicula in the Northeast Atlantic). This species is assessed as Least Concern because it is apparently still abundant, despite heavy fishing pressure within its range, and there is no evidence for population decline.
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Population

Population
Thought to be common in its areas of occurrence (Compagno et al. 2005).

Population Trend
Unknown
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Threats

Major Threats
Captured incidentally by commercial trawl, nets, bottom gill-nets and bottom longline fishing, and usually discarded (Horie and Tanaka 2002). This species comprised 40% of discarded fish in Yamaguchi Prefecture, southern Japan (Horie and Tanaka 2002). Discard survivorship may be high as the species appears to be hardy.
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Least Concern (LC)
  • IUCN 2006 2006 IUCN red list of threatened species. www.iucnredlist.org. Downloaded July 2006.
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Management

Conservation Actions

Conservation Actions
None in place.
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Wikipedia

Cloudy catshark

The cloudy catshark (Scyliorhinus torazame) is a common species of catshark, belonging to the family Scyliorhinidae. It is a bottom-dweller that inhabits rocky reefs in the northwestern Pacific Ocean, from the shore to a depth of 320 m (1,050 ft). Growing up to 50 cm (20 in) long, this small, slim shark has a narrow head with a short blunt snout, no grooves between the nostrils and mouth, and furrows on the lower but not the upper jaw. It is also characterized by extremely rough skin and coloration consisting of a series of dark brown saddles along its back and tail, along with various darker and lighter spots in larger individuals.

The diet of the cloudy catshark consists of molluscs, crustaceans, and bony fishes. It is oviparous, with females laying encapsulated eggs two at a time in nursery areas. The claspers of the male bear numerous hooks that likely serve to facilitate copulation. This harmless shark can be readily maintained in captivity and is used as a model organism for biological research. It is caught incidentally, and generally discarded, by commercial fisheries. These activities do not appear to have negatively affected its population, leading it to be listed under Least Concern by the International Union for Conservation of Nature (IUCN).

Taxonomy[edit]

The original description of the cloudy catshark was published in 1908 by Shigeho Tanaka in the Journal of the Faculty of Science, University of Tokyo. He gave it the specific epithet torazame, which is its Japanese name (虎鮫, literally "tiger shark"), and assigned it to the genus Catulus. The type specimen was a 45 cm (18 in) long adult male caught off Misaki, Kanagawa, Japan.[3] Subsequent authors have synonymized Catulus with Scyliorhinus.[4]

Description[edit]

Large cloudy catsharks have light spots in addition to dark dorsal saddles

The cloudy catshark reaches 50 cm (20 in) long and has a thin, deep, and firm body. The narrow head makes up slightly under one-sixth of the total length, and is two-thirds as wide as it is long. The snout is short and rounded. The large nostrils are preceded by small, triangular flaps of skin that do not reach the wide mouth. The medium-sized eyes are horizontally oval, equipped with rudimentary nictitating membranes (protective third eyelids), and followed by moderate spiracles. There are no grooves between the nostrils and the mouth. There are furrows extending from the corners of the mouth over the lower jaw only. The small teeth have a long central cusp typically flanked by two pairs of cusplets. The five pairs of gill slits are short, with the fourth pair over the pectoral fin origins.[4][5]

The two dorsal fins are placed towards the back of the body, with the first originating over the rear of the pelvic fin bases. The first dorsal fin has a rounded apex and is larger than the second dorsal fin, which has a more angular shape. The pectoral and pelvic fins are moderate in size. In males, the inner margins of the pelvic fins are merged to form an "apron" over the long, cylindrical claspers. The origin of the anal fin lies approximately between the dorsal fins. The caudal peduncle is about as deep as the body, and leads to a low caudal fin with an indistinct lower lobe and a ventral notch near the tip of the upper lobe. The skin is thick and very rough due to the dermal denticles, which are large and upright with three backward-pointing teeth. This species is brown on the back and sides, with 6–10 indistinct darker dorsal saddles, and plain yellowish on its ventral side. Larger sharks also have many large, irregularly-shaped light and dark spots.[4][5]

Distribution and habitat[edit]

The cloudy catshark is common in the northwestern Pacific off Japan, Korea, China, and possibly the Philippines.[2] Bottom-dwelling in nature, this species can be found from the shore out to a depth of 320 m (1,050 ft) on the continental shelf and upper continental slope.[1] It favors rocky reefs and does not appear to be migratory.[6]

Biology and ecology[edit]

Egg capsules of the cloudy catshark with visible embryos

The cloudy catshark feeds primarily on molluscs, followed by crustaceans and bony fishes.[7] A predator of both this shark and its egg cases is the blotchy swell shark (Cephaloscyllium umbratile).[8] A known parasite of this species is the myxosporidian Chloromyxum scyliorhinum.[9] Reproduction is oviparous; adult females have a single functional ovary and two functional oviducts.[5] As a prelude to mating, the male bites at the female's pectoral fin, side, and gill region. Once he has a grip, he wraps his body around hers and inserts one of his claspers into her cloaca. Copulation may last between 15 seconds and 4 minutes.[10] The claspers of the male are unusual in that each has a row of around a hundred hooks running along the inner margin. These hooks likely serve to anchor the male to the female during copulation.[11] The female is capable of storing sperm within her nidamental gland (an organ that secretes egg cases) for many months.[12]

Females produce two mature eggs at a time, one per oviduct. The eggs are enclosed in smooth, translucent yellow, vase-shaped capsules measuring 1.9 cm (0.75 in) across and 5.5 cm (2.2 in) long. There are long tendrils at the four corners of the capsule. The eggs are laid in defined nursery areas: One such area is located at a depth of 100 m (330 ft) off Hakodate. When the embryo is 3.6 cm (1.4 in) long, it has external gills, undeveloped fins, and no pigmentation. At an embryonic length of 5.8 cm (2.3 in), the external gills have all but disappeared, and a covering of small denticles is present. By a length of 7.9 cm (3.1 in), the embryo has well-developed fins and pigmentation, and generally resembles the adult.[5] The eggs take 15 months to hatch at 11.3 °C (52.3 °F), and 7–9 months to hatch at 14.5 °C (58.1 °F).[6] The newly hatched shark measures 8 cm (3.1 in) long or more.[4] Maturation size tends to increase with decreasing water temperature: Off northerly Hakodate, both sexes mature at over 38 cm (15 in) long, while some females remain immature even at 47 cm (19 in) long. By contrast, off southerly Tsushima Island both sexes mature at around 33 cm (13 in) long.[5][13] The maximum lifespan is at least 12 years.[6]

Human interactions[edit]

Several young cloudy catsharks at a public aquarium

Harmless to humans, the cloudy catshark adapts well to captivity and has reproduced in the aquarium.[6] It is often used as a model organism in physiology research.[14][15] On September 25, 1995, Masuda Motoyashi and colleagues used this species to perform the first successful artificial insemination of a shark or ray.[12] The cloudy catshark is caught incidentally by commercial fisheries with bottom fishing nets including trawls and gillnets, as well as on bottom longlines. Captured individuals are typically discarded, possibly with a high survival rate due to their hardiness. Some 40% of the fish discarded in Yamaguchi Prefecture fisheries are of this species.[1] The bottom trawl fishery operating off Fukushima Prefecture may catch over a ton of cloudy catsharks annually, which are also discarded.[16]

Despite heavy fishing pressure within its range, the cloudy catshark remains common, perhaps because it may be more biologically productive than most other sharks. As a result, it has been assessed as Least Concern by the International Union for Conservation of Nature (IUCN).[1] Cloudy catsharks from a number of locations off Japan have been found to be contaminated with polychlorinated biphenyls (PCBs) and dichlorodiphenyldichloroethylene (DDEs), which they acquire from their food. One likely source of these pollutants is the use of the pesticide DDT by developing nations in southern Asia.[17]

References[edit]

  1. ^ a b c d Nakaya, K., S. Tanaka, and S. Iglésias (2008). "Scyliorhinus torazame". IUCN Red List of Threatened Species. Version 2010.4. International Union for Conservation of Nature. Retrieved December 14, 2010. 
  2. ^ a b Compagno, L., M. Dando, and S. Fowler (2005). Sharks of the World. Princeton University Press. p. 253. ISBN 978-0-691-12071-3. 
  3. ^ Tanaka, S. (1908). "Notes on some Japanese fishes, with descriptions of fourteen new species". Journal of the College of Science, Imperial University, Tokyo 23 (7): 1–54. 
  4. ^ a b c d Compagno, L.J.V. (1984). Sharks of the World: An Annotated and Illustrated Catalogue of Shark Species Known to Date. Rome: Food and Agricultural Organization of the United Nations. pp. 367–368. ISBN 92-5-101384-5. 
  5. ^ a b c d e Nakaya, K. (1975). "Taxonomy, comparative anatomy and phylogeny of Japanese catsharks, Scyliorhinidae". Memoirs of the Faculty of Fisheries, Hokkaido University 23: 1–94. 
  6. ^ a b c d Michael, S.W. (1993). Reef Sharks & Rays of the World. Sea Challengers. p. 54. ISBN 0-930118-18-9. 
  7. ^ Froese, Rainer and Pauly, Daniel, eds. (2009). "Scyliorhinus torazame" in FishBase. April 2009 version.
  8. ^ Taniuchi, T. (1988). "Aspects of reproduction and food habits of the Japanese swellshark Cephaloscyllium umbratile from Choshi, Japan". Nippon Suisan Gakkaishi 54 (4): 627–633. doi:10.2331/suisan.54.627. 
  9. ^ Noble, E.R. (1948). "A new Myxosporidian (Protozoan) parasite from Scyliorhinus torazame". Transactions of the American Microscopical Society 67 (3): 254–256. doi:10.2307/3223188. JSTOR 3223188. 
  10. ^ Pratt, H.L. and J.C. Carrier (2001). "A review of elasmobranch reproductive behavior with a case study on the nurse shark, Ginglymostoma cirratum". Environmental Biology of Fishes 60: 157–188. doi:10.1023/A:1007656126281. 
  11. ^ Schmidt, P.J. (June 30, 1930). "A selachian clasper with a hundred hooks". Copeia (American Society of Ichthyologists and Herpetologists) 1930 (2): 48–50. doi:10.2307/1435684. JSTOR 1435684. 
  12. ^ a b Motoyasu, M., I. Yoshiyuki, K. Shigenori, I. Haruyuki, and I. Tooru (2003). "Artificial insemination of the cloudy catshark". Journal of Japanese Association of Zoological Gardens and Aquariums 44 (2): 39–43. 
  13. ^ Horie, T. and S. Tanaka (March 2002). "Geographic variation of maturity size of the cloudy catshark, Scyliorhinus torazame, in Japan". Journal of the Faculty of Marine Science and Technology 53: 111–124. 
  14. ^ Bentley, P.J. (1998). Comparative Vertebrate Endocrinology (third ed.). Cambridge University Press. p. 20. ISBN 0521629985. 
  15. ^ Kaas, J.H., G.F. Striedter, and J.L.R. Rubenstein, ed. (2009). Evolutionary Neuroscience. Academic Press. p. 417. ISBN 0-12-375080-6. 
  16. ^ Sakaguchi, M. (2004). More efficient utilization of fish and fisheries products: proceedings of the international symposium on the occasion of the 70th anniversary of the Japanese Society of Fisheries Science, held in Kyoto, Japan, 7–10 October 2001. Elsevier. p. 27. ISBN 0-08-044450-4. 
  17. ^ Horie, T., H. Tanaka, and S. Tanaka (2004). "Bioaccumulation of PCBs and DDE in cloudy catshark, Scyliorhinus torazame, caught in four locations around Japan". Journal of the School of Marine Science and Technology Tokai University 2 (2): 33–43. 
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