Field Guide for the identification of

Transcription

1 Field Guide for the identification of major demersalfishes of India DEMERSAL FISHERIES DIVISION, CMFRI RekhaJ. Nair and P.U Zacharia

2 Body Shape - 4 Basic Body Shapes Fusiform Attenuated Flattened Compressed

3 Snout Shape

4 Eye Size To Body Size

5 Dorsal Fins

6 Fin Spines

7 Soft Dorsal Fins

8 Adipose Fin

9 Finlets Caudal fin

10 Caudal fin

11 Anal Fins

12 Pectoral Fins a b c

13 Gills Gill rakers

14 Barbels

15 Lateral line Scale Forms

16 Elasmobranchs Fishery is constituted by sharks, rays and skates. They belong to Class Chondrichthys. 51 families, 178 genera, 937 species of extant elasmobranchs(iearound 403 spsof sharks & 534 spsof skates and rays) 28 species of sharks and rays are known from freshwater. In India- 110 species of elasmobranchs-66 species of sharks, 4 saw fishes, 8 guitar fishes and 32 rays 34 species are commercially important

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18 Order Carcharhiniformes Family Carcharhinidae-(Requiem sharks) one of the largest and most important families of sharks eyes circular nictitating eyelids internal; spiracles usually absent.

19 Genus : Carcharhinus Small to large sharks with round eyes, internal nictitating eyelids, usually no spiracles. Teeth usually blade like with one cusp. Development usually viviparous with young born fully developed. Includes several dangerous species.

20 Carcharhinus brevipinna Conspicuous white band on sides. Second dorsal, anal, undersides of pectorals and lower caudal fin lobe black or dark grey-tipped; dorsal origin behind pectoral fin Black tip persistent on pelvic; dorsal origin at posterior end of pectoral Carcharhinus limbatus Black tip shark

21 C. melanopterus Carcharhinus dussumieri Yellow-brown above; a prominent black tip of first dorsal fin set off abruptly by a light band below it; a conspicuous dark band on flanks, extending rearward to pelvic fins C. amblyrhyncoides Graceful shark Caudal fin prominently edged with black along entire posterior edge; first dorsal fin plain or whitetipped, never black-tipped Black spot

22 Families : Hemiscyllidae bamboo sharks Yellow-brown or grey-brown above, cream below, with prominent saddle marks in young, fading with growth; mouth closer to eyes than snout tip; Two dorsal fins, slightly smaller than pelvic fins and without attenuated, projecting free rear tips; origin of first dorsal fin varying from over last 1/3 of pelvic-fin bases to over pelvic-fin insertions. Chiloscyllium griseum C. indicum Light brown above, cream below, with numerous dark spots on body, tail, and fins, these often forming indistinct vertical bars and saddles.

23 2. Alopidae Alopias superciliolus Bigger eyes Alopias vulpinus dorsal fin equidistant between pectoral and pelvic, white colour expands from abdominal area to pectoral base (absent in A. superciliolus)

24 Galeocerdo cuvier Body colour pattern, blunt snout, very small spiracles Rhizoprionodon acutus Carcharhinus sorrah Pectorals, second dorsal fin, and lower caudal fin lobe with conspicuous black tips. Small, slender shark; second dorsal fin smaller than anal fin, its origin far posterior to midlength of anal fin base; anal fin with slightly concave posterior margin and a pair of long preanal ridges.

25 Genus Glyphis Glyphisgangeticus Gangetic shark First few anterior teeth in lower jaw with entire smooth cutting edges and low cusplets on the crown foot. Second dorsal fin lower, about half height of first dorsal.

26 Glyphisglyphis - Spear tooth shark First few anterior teeth in lower jaw with cutting edges confined to tips of cusps, giving the cusps a spearlike shape, and no cusplets. Second dorsal higher, about 3/5 height of first dorsal.

27 Eridacnisradcliffei - Pygmy ribbontail catshark It occurs around the edges of continental and insular shelves at a depth of m. Males mature at cm TL or less and reach 23 cm TL, and females mature at about cm TL and reach 24 cm TL. Reproduction is ovoviviparous with one or two young per litter. The species feeds primarily on small bony fishes, crustaceans and squid.

28 Eusphyra blochii Scoliodon laticaudus Spadenose shark bronzy grey above, white below, fins sometimes darker than body; no conspicuous markings. Blades broader Sphyrna lewini

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31 Family Rhinidae bow mouth guitar fish Rhina ancylostoma Bow mouth guitarfish Snout and body deeply rounded Body blackish grey dorsally with white spots

32 Rhinobatos annandalei Glaucostegus granulatus = Rhinobatos granulatus

33 Family Rhynchobatidae wedge fish Genus Rhynchobatus Large guitarfish with large black eyespots on the pectoral bases a distinctive black cross between the eyes rows of small white spots on the upper body snout pointed and lower caudal lobe short

34 Very large, plate like denticles scattered sparsely over the body and armed with one or more thorn like cusps Echinorhinus brucus bramble shark

35 Carcharhinus hemiodon -Pondicherry sha Grey above, white below, with the tips of the pectorals, and upper and lower caudal fin lobes black; other fins dusky. Estuaries, rivers minute eyes Glyphis gangeticus Glyphis glyphis

36 Rhincodon typus whale shark Included in Appendix II of the Convention on International Trade in Endangered Species of Wild Fauna and Flora (CITES) since May 2003 which regulates international trade of this species. A heavily armored stingray lacking a venomous barb; young with large, flat denticles on upper surface; large juveniles and adults with additional sharp conical thorns and small, pointed denticles. Very thick elongated disc with broadly rounded outer corners; snout broadly rounded and tail slender, about as long as body and without finfolds Urogymnus asperrimus Porcupine ray

37 Pristis microdon First dorsal fin with origin well anterior to pelvic-fin origins Pristis zijsron First dorsal fin origin somewhat posterior to pelvic-fin origins but ahead of pelvic-fin insertions. Rhynchobatus djiddensis Large guitarfish with large black eyespots on the pectoral bases, a distinctive black cross between the eyes, and rows of small white spots on the upper body; snout pointed and lower caudal lobe short

38 Family Dasyatidae (whip tail sting rays) Dorsal fin totally absent or indistinct if when present. Tail long and whip-like. Most species with at least 1 long venomous spine on tail, which can cause excruciating pain to humans. Neotrygon kuhlii Tail with alternating black and white bands, tip mostly pale; skin folds paleatbasewithdarkoutermargin,discwithbluedots Himantura uarnak Rhinoptera javanica no upper caudal finfold but with high lower caudal finfold- 2 to 3 times depth of tail but not reaching tail tip; no large thorns; 1 or 2 long stings on tail, further behind tail base Pastinachus sephen

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40 Order Perciformes Over 20 families; 3 families major perches (due to their body size), the rest smaller minor perches. Major perches - Serranidae - Groupers Lutjanidae - Snappers Lethrinidae - Pigface breams Expensive fishes -in the local and international markets. Ornamental Important content of the international Live Reef Food Fish Trade. (LRFFT).

41 Groupers Lutjanids

42 Groupers Groupers

43 Groupers

44 Caudal fin emarginate Rounded tip of upper caudal Lutjanus gibbus LUTJANIDS Lutjanus bohar Longer snout, truncate tail than Lutjanus kasmira Aphraeus furca Steel blue colour and yellow fins L. argentimaculatus

45 Lutjanus vitta S N Pristipomoides typus Lutjanus lutjanus A P P E R S Pinjalo pinjalo Aprion virescens distinct horizontal groove in front of eye Lutjanus malabaricus

46 Lethrinus lentjan Lethrinus mahsena posterior margin of the opercle and sometimes the base of the pectoral fin is red Scolopsis vosmeri Nemipterus randalli Gnathodentex aurolineatus

47 Alectis ciliaris Atropus atropus Megalaspis cordyla Scutes Carangids Scomberoides tol Black pelvic fin; foldable into a pouch Eye position, dot patterns Seriola rivoliana Parastromateus niger

48 Family Serranidae Groupers Genus Variola Head length times in standard length Dorsal with 9 spines and rays Variola louti, Variola albimarginata

49 Genus Aetheloperca Aethelopercarogaa Red mouth grouper Dorsal fin with 9 spines Dorsal with rays Caudal fin truncate Pectoral fin asymmetric

50 Genus Cephalopholis Dorsal fin membranes deeply incised Maxilla with knob Caudal fin rounded Cephalopholisargus - Peacock hind Cephalopholisaurantia - Golden hind Pale orange-red with red dots on head, anterodorsally on body, and on base of dorsal fin. Posterior margin of caudal fin with a pale blue edge and black submarginal line Posterior parts of dorsal and anal fins often with a narrow pale blue edge

51 Priacanthidae

52 Sciaenids - croakers 44species reported -20 fishery. Major area east coast. The stock all over the country is at near optimum level and any further pressure will affect the stocks Nibea maculata

53 P. barberina Parupenaeus cyclostomus GOAT FISH P. macronema U. taeniopterus

54 Cynoglossus macrostomus Flatfish

55 Chelinius undulatus

56 Silverbellies 21 species have been reported from Indian waters - southern Tamilnadu 12 contribute to the coastal fishery S. ruconius L. splendens S.insidiator

57 Thank you