Small-scale whiting

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Small-scale whiting
Sillago parvisquamis 01.JPG
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Actinopterygii
Order: Spariformes
Family: Sillaginidae
Genus: Sillago
Species:
S. parvisquamis
Binomial name
Sillago parvisquamis
Gill, 1861
S. parvisquamis distribution.PNG
Approximate range of the small-scale whiting

The small-scale whiting (Sillago parvisquamis), also known as the blue whiting, is a species of inshore marine fish of the smelt-whiting family Sillaginidae. The small-scale whiting is very similar in body shape and colour to other species in the genus Sillago , but is distinguished by having 12 or 13 spines in the first dorsal fin compared to 11 in all other species. The species is distributed through parts of the west Pacific Ocean including Japan, Taiwan, Korea and India, inhabiting the tidal flats of major estuaries. It is a benthic predator taking crustaceans, molluscs and annelids. Spawning in the species takes place from May to September, with peaks identified in June and July. The eggs and larvae have been extensively studied in order to distinguish them from the more abundant Sillago sihama . Minor fisheries exist for the small-scale whiting, although it is thought be endangered by habitat loss and pollutionIUCN.

Contents

Taxonomy and naming

The small-scale whiting is one of over 30 species in the genus Sillago , [2] which is one of five genera belonging to the smelt whiting family Sillaginidae, this family was previously considered to be part of the Percoidea, a suborder of the Perciformes. [3] The 5th edition of Fishes of the World classifies the Sillaginidae in the order Spariformes. [4]

The species was first scientifically described by Theodore Gill in 1861 in the first review of the sillaginid fishes; "Synopsis of the Sillaginoids". The type specimen was taken from the waters of Kanagawa, near Yokohama in Japan. [3] There has only been one formal misidentification, made by Peter Forsskål in 1913 when he mistook the species for Sillago sihama . The name "small-scale whiting" is in reference to the species' smaller than average scales amongst the genus Sillago.

Description

The small-scale whiting is very similar in external appearance to many other members of the genus Sillago, which have a slightly compressed, elongate body tapering toward the terminal mouth. [5] The dorsal fin is in two parts, the first made of feeble spines and the second of soft rays headed by a single feeble spine. The first dorsal fin has either 12 or 13 dorsal spines, a feature unique among Sillago which otherwise have 11 dorsal spines. The second dorsal fin has a single spine followed by 20 to 22 soft rays, while the anal fin has 2 spines and 22 or 24 soft rays. Other distinguishing features include 79 to 84 lateral line scales and 39 to 40 vertebrae, while the swimbladder morphology also is a highly distinguishing feature. [5] The maximum known size of the species is 30 cm. [3]

The swimbladder has two anterior extensions that arise medially, diverge and terminate. Two lateral extensions appear anteriorally, each with a blind tubule which curves to the abdominal walls and becomes a complex network of blind tubules. There are two posterior tapering extensions that project into and terminate into the caudal region. A duct like process is present from the lateral surface to the urogenital opening. This configuration is very similar to S. sihama, except that the lateral tubules are more complex than in S. sihama. [3]

The small-scale whiting is a pale brown to dull brown colour above and lighter below with a faint mid-lateral band normally present. The fins are all hyaline in appearance except for the dorsal fin which becomes dusky terminally with 5 or 6 rows of dusky spots on the soft dorsal fin membrane. [3]

Distribution and habitat

The small-scale whiting occupies a fairly restricted range in the northwest Pacific Ocean consisting of southern Japan, Taiwan, Korea [6] and India. [7] In Japan the species is known from the southern half of the island chain below Tokyo in the west and Yokohama in the east. The species is rare in both Korea and India, with only a single reported capture of the species in these countries. The species inhabits waters from 0 to 30 m in depth, often found on well developed tidal flats in the estuaries of large rivers. [5] The larvae and juveniles of the species commonly inhabit these environments also, with juveniles often inhabiting the shallowest parts of the tidal flats. [8]

Biology

Like other sillaginids, S. parvisquamis is a benthic predator and is known to consume a variety of crustaceans, molluscs and annelid worms. [9] Studies in the Buzen Sea of Japan have found the small-scale whiting spawns from May to July, while laboratory studies have similarly found that spawning occurs from May to September with a peak from June to July. [10] Laboratory conditions also showed that spawning occurs at night predominantly between 20:30 and 22:00 hours. [11] The eggs are buoyant and spherical in shape with an average diameter of 0.71 mm and are transparent and colourless. Larval and juvenile development has been extensively described by Imoto and Matsui (2000), with a number of characteristics including higher numbers of myomeres and melanophores on the dorsal surface of the body as well as a lack of a vertical band of melanophores on the caudal peduncle distinguishing the larvae from those of S. japonica. [11] Modelling based on growth observations in the species suggests the female starts life smaller than the male but grows faster and is larger than the male within two years. [12] The models put forward by Imoto et al. in 1997 also suggest that the male reaches a maximum of 288 mm while the female reaches 332 mm, assuming their life span is long enough for these theoretical maxima to be reached. [12]

Relationship to humans

Like many species of Sillago in the Asian region, S. parvisquamis is commonly taken in seines from beaches and estuaries but often suffers the same fate of other lesser known sillaginids in being confused with S. sihama. [5] This identification issue, as well as the fact that fisheries statistics are poor or non-existent in such countries means catch statistics are not available. In a 1984 review of the Japanese sillaginids, Sano and Mochizuchi described the species as being endangered due to habitat destruction and pollution, [13] a statement echoed in a number of other papers since, although the IUCN does not recognise the species as being in danger. [9] The discovery of the species in Korea in 1996 suggests its range may be greater than previously supposed, and thus less in danger of extinction than proposed by Sano and Mochizuchi. [6] The flesh is held in high regard in Japan, but is still considered inferior to that of S. japonica. For this reason, McKay proposed in 1992 that the species is possibly a candidate for aquaculture, although such a move has not yet been made. [5]

Related Research Articles

<span class="mw-page-title-main">Sillaginidae</span> Family of fishes

The Sillaginidae, commonly known as the smelt-whitings, whitings, sillaginids, sand borers and sand-smelts, are a family of benthic coastal marine fish historically classified in the order Perciformes, although the 5th edition of Fishes of the World places the family in the Spariformes. The smelt-whitings inhabit a wide region covering much of the Indo-Pacific, from the west coast of Africa east to Japan and south to Australia. The family comprises only five genera and 35 species, of which a number are dubious, with the last major revision of the family in 1992 unable to confirm the validity of a number of species. They are elongated, slightly compressed fish, often light brown to silver in colour, with a variety of markings and patterns on their upper bodies. The Sillaginidae are not related to a number of fishes commonly called 'whiting' in the Northern Hemisphere, including the fish originally called whiting, Merlangius merlangus.

<span class="mw-page-title-main">Gangetic whiting</span> Species of fish

The Gangetic whiting, also known as the Gangetic sillago or flathead sillago, is a species of inshore marine and estuarine fish of the smelt-whiting family, Sillaginidae. It is the most distinctive Asian member of the family due to its flattened head and trailing dorsal fins. Although first described in 1822, it was not placed in its own genus until 1861 when Theodore Gill erected Sillaginopsis, a genus which is still monotypic. Gangetic whiting are of minor commercial importance along the Southeast coast of the Asian continent where it inhabits protected areas.

<span class="mw-page-title-main">Oriental trumpeter whiting</span> Species of fish

The oriental trumpeter whiting is a widely distributed species of benthic inshore fish in the smelt-whiting family. The species ranges from east Africa to Japan, inhabiting much if the southern Asian and Indonesian coastlines. Its morphology is very similar to other species within the genus Sillago, with a long, compressed body and silvery overall colour. It can be distinguished from its relatives by colour patterns and particularly swim bladder morphology, which helps define most species of Sillago. S aeolus is a benthic predator, consuming a variety of crustaceans and polychaetes. As with most members of the smelt whiting family, it is important to small coastal fisheries in various areas of its range.

<span class="mw-page-title-main">Golden lined whiting</span> Species of fish

The golden lined whiting, also known as the Tin Can Bay whiting or rough-scale whiting, is a species of inshore marine fish of the smelt whiting family, Sillaginidae that inhabits the coastlines of northern Australia and lower Papua New Guinea. The golden lined whiting can be more readily distinguished by its colour than other whitings in the genus Sillago, although swim bladder morphology and spine and ray counts are the most precise method of identification. S. analis is an opportunistic predator, taking a variety of crustaceans, polychaetes and molluscs, with a transition of diet seen as the fish mature. One unusual aspect about the species diet is the large amounts of molluscan siphons it takes. The species spawns between January and March, with juvenile fish inhabiting the shallow protected coastal waters. Golden lined whiting is important to fisheries centered on Shark Bay in Western Australia and also in Queensland, although makes up a relatively minor component of the whiting fishery.

<span class="mw-page-title-main">Shortnose whiting</span> Species of fish

The shortnose whiting is a poorly known species, described in 1989, of inshore marine fish of the smelt whiting family Sillaginidae that inhabits only the Persian Gulf. S. arabica is similar in morphology to other sillaginids, although has a distinctive shortened snout which gives the species its common name. This species is of no current interest to local fisheries, although beach seines may take minor amounts of this species.

<span class="mw-page-title-main">Asian whiting</span> Species of fish

The Asian whiting is a species inshore marine fish in the smelt whiting family, Sillaginidae, distributed along the Asian coastline from the Gulf of Thailand to Taiwan. The Asian whiting's appearance is very similar to other closely related species in the genus Sillago, with swim bladder morphology and ray counts of fins the most reliable identifying features. The species inhabits slightly deeper water than many of the sillaginid species its distribution overlaps, forming an important part of the whiting fishery in the countries within its range.

<span class="mw-page-title-main">Boutan's whiting</span> Species of fish

Boutan's whiting is a poorly understood species of coastal marine fish of the smelt-whiting family Sillaginidae that inhabits the waters of the Gulf of Tonkin and south eastern China. Like most sillaginids, the species inhabits areas populated with a number of other whiting species of similar appearance, causing the species to often be misidentified as the well known Sillago sihama, and for this reason its biology is poorly known. The species is taken by seine net in Vietnam and is often exported to Japan.

<span class="mw-page-title-main">Indian whiting</span> Species of fish

The Indian whiting is a poorly known species of coastal marine fish of the smelt-whiting family Sillaginidae. The species was named in 1985, having previously being misidentified as another species of Sillago, S. parvisquamis. The Indian whiting inhabits the east and west coasts of the Indian subcontinent, apparently not extending to the southern tip of India. Like all sillaginids, it is benthic in nature, living in depths to 30 m where it is caught by fishermen alongside other species of Sillago.

<span class="mw-page-title-main">Bay whiting</span> Species of fish

The bay whiting is a species of coastal marine fish of the smelt-whiting family, Sillaginidae. The bay whiting's range extends throughout the west Indian Ocean, including northern Australia, Thailand, India and Taiwan, where it inhabits protected waters. It is benthic in nature, preying on shrimps, polychaetes and molluscs, however little else is known of its biology. Bay whiting are an important part of some inshore fisheries around Australia and Asia, where subsistence and commercial fishermen regularly take the species.

<span class="mw-page-title-main">Intermediate whiting</span> Species of fish

The Intermediate whiting, is a species of coastal marine fish of the smelt-whiting family Sillaginidae. The intermediate whiting ranges from the west coast of India to the Gulf of Thailand in the east, inhabiting silty substrates in shallow waters. First identified in 1977 from a specimen found in a fish market, the species has had little research performed on its biology, and is frequently misidentified as Sillago sihama or Sillago maculata intermediate whiting are commonly caught by fishermen throughout their range and are marketed fresh locally.

<span class="mw-page-title-main">Japanese whiting</span> Species of fish

The Japanese whiting, also known as the Japanese sillago or Shiro-gisu, is a common species of coastal marine fish belonging to the smelt-whiting family, Sillaginidae. As suggested by its name, the Japanese whiting was first recorded from Japan in 1843, but has subsequently been found to extend to Korea, China and Taiwan.

<span class="mw-page-title-main">Large-scale whiting</span> Species of fish

The large-scale whiting the only member of the genus Sillaginops, is a poorly understood species of coastal marine fish of the smelt- whiting family Sillaginidae. First described in 1859, the large-scale whiting is known to inhabit shallow waters along the coasts of a number of Indo-Pacific countries including Japan, Indonesia, Philippines and the Solomon Islands. Little is known of the species biology, even though it is of minor importance to fisheries throughout its range.

<span class="mw-page-title-main">Trumpeter whiting</span> Species of fish

The trumpeter whiting, also known as the winter whiting or diver whiting, is a common species of coastal marine fish of the smelt-whiting family, Sillaginidae. The trumpeter whiting is endemic to Australia, inhabiting the eastern seaboard from southern New South Wales to northern Queensland. The species is found in bays, estuaries, coastal lakes and mangrove creeks on silty and muddy substrates in waters ranging from 0 to 30 m deep, occasionally inhabiting sandy and seagrass beds.

<span class="mw-page-title-main">Large-headed whiting</span> Species of fish

The large-headed whiting is a dubious species of coastal marine fish in the smelt-whiting family that has only been recorded from one specimen captured off the coast of China in 1933. Although very similar to Sillago sihama, the species is characterised by an unusually large head which accounts for 33% of the total body length.

<span class="mw-page-title-main">Small-eyed whiting</span> Species of fish

The small-eyed whiting is a poorly known species of coastal marine fish of the smelt-whiting family Sillaginidae. The species is known from only two specimens; the holotype collected by Roland McKay in 1985 from a Taipei market, both specimens of which were taken from the waters of Taiwan. Apart from a relatively small eye size, the species is hard to distinguish from other common species of sillaginid taken in the area, and may be a minor part of local fisheries.

<span class="mw-page-title-main">Northern whiting</span> Species of fish

The northern whiting, also known as the silver whiting and sand smelt, is a marine fish, the most widespread and abundant member of the smelt-whiting family Sillaginidae. The northern whiting was the first species of sillaginid scientifically described and is therefore the type species of both the family Sillaginidae and the genus Sillago. The species is distributed in the Indo-Pacific region from South Africa in the west to Japan and Indonesia in the east. The northern whiting inhabits coastal areas to 60 m, but is most often found in shallow water around bays and estuaries, often entering freshwater. It is a carnivore, taking a variety of polychaetes and crustaceans. The species is of major economic importance throughout the Indo-Pacific. It is most frequently taken by seine nets and cast nets and marketed fresh.

<span class="mw-page-title-main">Soringa whiting</span> Species of fish

The soringa whiting, also known simply as soringa or soringa sillago, is a poorly known species of coastal marine fish of the smelt-whiting family, Sillaginidae. The Soringa whiting is known exclusively from the east coast of India, inhabiting shallow inshore environments, particularly sandy substrates. S. soringa was first described in 1982 by Dutt and Sujatha, with the taxonomic status of the species was questioned by Roland McKay in his review of the Sillaginidae, with similar features to S. asiatica suggesting it is a senior synonym of the latter.

<span class="mw-page-title-main">Estuarine whiting</span> Species of fish

The estuarine whiting, also known as Vincent's whiting, is a species of benthic inshore marine fish of the smelt-whiting family, Sillaginidae. The estuarine whiting is very similar in appearance to the northern whiting, Sillago sihama, and as such was mistaken for the latter until 1980, when R.J. McKay identified the species based primarily on swimbladder morphology. The estuarine whiting is distributed along both the east and west coasts of India, primarily inhabiting the muddy substrates of estuaries. The species is locally important to fisheries in India, and is recognized as having aquaculture potential.

<span class="mw-page-title-main">Yellowfin whiting</span> Species of fish

The yellowfin whiting, also known as the western sand whiting or fine-scaled whiting, is a species of inshore marine fish in the smelt-whiting family Sillaginidae. The species is endemic to the eastern Indian Ocean, ranging from Dampier, Western Australia to Gulf St Vincent in South Australia, with an apparent division in the populations of the two states. Yellowfin whiting inhabit relatively shallow waters for their entire life, often found on tidal flats and creeks, as well as large estuaries. It is one of the largest members of the smelt-whiting family, growing to 42 cm, and can be distinguished by a number of anatomical and colour related features. Yellowfin whiting are benthic carnivores, preying predominantly on polychaete worms, with minor amounts of copepods, amphipods and bivalves also commonly taken. The species shows a change in diet with age, and also dietary differences with other sillaginids presumably to minimize competition. Reproduction occurs at different times throughout its range, generally focused around summer, with up to 217,000 eggs produced per season. Yellowfin whiting reach sexual maturity at around 20 cm, with each individual spawning more than once. The species forms the basis of major fisheries in both Shark Bay, Western Australia and the two Gulfs of South Australia, with around 260 tonnes of fish taken each year. They are also a popular target for shore based anglers, with a reputation as a very good table fish.

<span class="mw-page-title-main">Chinese sillago</span> Species of fish

The Chinese sillago is a species of inshore marine fish in the smelt whiting family Sillaginidae, described in 2011. The species is known only to inhabit the coastal waters of China, primarily in estuarine tidal flats near Wenzhou, Zhejiang Province. The Chinese sillago was described in 2011 based on morphological and DNA barcode analysis of several specimens. Several detailed anatomic features distinguish it from other sillaginids, with Sillago parvisquamis its closest relative based on phylogenetic analysis. Nothing is known of the ecology or importance to fisheries of the Chinese sillago.

References

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  2. Froese, Rainer and Pauly, Daniel, eds. (2023). Species of Sillago in FishBase . June 2023 version.
  3. 1 2 3 4 5 McKay, R.J. (1985). "A Revision of the Fishes of the Family Sillaginidae". Memoirs of the Queensland Museum. 22 (1): 1–73.
  4. Nelson, J.S.; Grande, T.C.; Wilson, M.V.H. (2016). Fishes of the World (5th ed.). Hoboken, NJ: John Wiley & Sons. pp. 502–506. doi:10.1002/9781119174844. ISBN   978-1-118-34233-6. LCCN   2015037522. OCLC   951899884. OL   25909650M.
  5. 1 2 3 4 5 McKay, R.J. (1992). FAO Species Catalogue: Vol. 14. Sillaginid Fishes Of The World (PDF). Rome: Food and Agricultural Organisation. pp. 19–20. ISBN   92-5-103123-1.
  6. 1 2 Ik-Soo, Kim; Lee, Wan-O (1996). "New record of the Sillaginid Fish, Sillago parvisquamis (Pisces: Sillaginidae) from Korea". Korean Journal of Zoology. 39 (1): 21–25. ISSN   0440-2510.
  7. Dutt, S.; Sujatha, K. (1980). "On the seven species of fishes of the family Sillaginidae from Indian waters". Mahasagar. 13 (4): 371–375. ISSN   0542-0938.
  8. Imoto, Hasaya; Seiichi Matsui; Norio Onikura; Erika Araki (1999). "Occurrence of larval and juvenile blue whiting Sillago parvisquamis in the estuary of Ima and Nagao Rivers of north eastern Kyushu, Japan". Nippon Suisan Gakkaishi. 65 (4): 753–754. doi: 10.2331/suisan.65.753 . ISSN   0021-5392.
  9. 1 2 Froese, Rainer; Pauly, Daniel (eds.) (2007). "Sillago parvisquamis" in FishBase . Dec 2007 version.
  10. Imoto, H.; Yoshioka, N.; Kitajima, C.; Matsui, S. (1997). "The age and growth of blue whiting, Sillago parvisquamis distributed in the coastal waters of north eastern Kyushu". Bull. Japan. Soc. Sci. Fish. (in Japanese). 63 (6): 892–898. doi: 10.2331/suisan.63.892 .
  11. 1 2 Imoto, Hisaya; Seiichi Matsui (2000). "Development of eggs, larvae and juveniles of laboratory reared blue whiting, Sillago parvisquamis (Percoidei:Sillaginidae)". Ichthyological Research. The Ichthyological Society of Japan. 47 (1): 59–67. doi:10.1007/BF02674314. ISSN   1341-8998.
  12. 1 2 Hisaya, Imoto; Yoshioka, Naoki; Kitajima, Chikara; Matsui, Seiichi (1997). "The age and growth of Blue Whiting, Sillago parvisquamis distributed in the coastal waters of North Eastern Kyushu". Nippon Suisan Gakkaishi. 63 (6): 892–898. doi: 10.2331/suisan.63.892 . ISSN   0021-5392.
  13. Sano, M; Mochizuchi, K (1984). "A Revision of the Japanese Sillaginid Fishes". Japanese Journal of Ichthyology. 31 (2): 136–149. ISSN   0021-5090.