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REFERENCES

Bass, A.J., J.D.D. Aubrey & N. Kistnasamy. 1973. Sharks of the east coast of southern Africa. I. The genus Carcharhinus (Carcharhinidae). Invest. Rep. oceanogr. Res. Inst.,(33); 1-168.

Bass, A.J., J.D.D. Aubrey & N. Kistnasamy. 1975. Sharks of the east coast of southern Africa. III. The families Carcharhinidae (excluding Mustelus and Carcharhinus) and Sphyrnidae. Invest. Rep. oceanogr. Res. Inst.,(38); 1-100.

Fischer, W. & P.J.P. Whitehead (eds.). 1974. FAO species identification sheets for fishery purposes. Eastern Indian Ocean (Fishing area 57) and Western Central Pacific (Fishing area 71). I-IV. FAO, Roma. pag. var.

Kami, H.T. 1973. The Pristipomoides (Pisces: Lutjanidae) of Guam with notes on their biology. Micronesica, 9(1):97-117.

Lindberg, G.U. 1974. Fishes of the world. A key to families and a checklist. John Wiley & Sons. Ltd. 545 p.

Nekrasov, V.V. 1968. Revision of the species of Decapterus (Family Carangidae, Order Perciformes) found in the Indian Ocean. J.Ichthyology, 9(2):159-167.

Schultz, L.P. 1969. The taxonomic status of the controversial genera and species of parrotfishes with a descriptive list (Family Scaridae). Smithsonian Contributions to Zoology,.. (17):1-49+8 plates.

Smith, J.L.B. 1963. New species and new records of fishes from the western Indian Ocean. Annals and Magazine of Natural History, Sec. 13-6: 33-37.

Smith, J.L.B. 1969. Ichthylogical bulletins 1-20. 1956-1961. The J.L.B. Smith Institute of Ichthyology, Rhodes University, Grahamstown. 1-356 + Index.

Smith, J.L.B. 1973. Ichthyological bulletins 21-32. 1961-1966. The J.L.B. Smith Institute of Ichthyology, Rhodes University, Grahamstown. 357-682 + Index.

Smith, J.L.B. 1977. Smith’s Sea fishes. Valiant Publishers, Sandton. 580 p.

Smith, J.L.B. & M.M. Smith. 1969. The fishes of Seychelles. The J.L.B. Smith Institute of Ichthyology, Rhodes University, Grahamstown. 223 p.

Sylva, D.P. de. 1973. Barracudas (Pisces: Sphyraenidae) of the Indian Ocean and adjacent seas. A prelimenary review of their systematics and ecology. J. mar. biol. Ass. India, 15(1): 74-94.

Wallace, J.H. 1967. The batoid fishes of the east coast of southern Africa. Part I: Sawfishes and guitarfishes. Invest. Rep. oceanogr. Res. Inst., (15): 1-32.

Whitehead, P.J.P. 1972. Synopsis of the clupeoid fishes of India. J. mar. biol. Ass. India., 14(1): 160-256.

Table 1. RECORD OF FISHING OPERATION

BT = Bottom trawl - PT = Pelagic trawl - LL = Bottom long line (200 hooks)
HL = Hand line - T = Traps (6 pcs.)
Catch in kilogrammes.

DATE

ST NO

GEAR TYPE

BOTTOM DEPTH

GEAR DEPTH

POSIT SOUTH

ION EAST

TOTAL CATCH

CATCH (PER HOUR)

DOMINANT SPECIES

13.7

204

T

43

43

4° 50‘

56°36’

7,7

1,28 per trap

Epinephelus leprosus

14.7

205

LL

40

40

4°49,1’

56°36,8’

5,3

3 per 100 hook

Lutjanus sebae

14.7

206

BT

42-46

42-46

4°59,5’

56°11,6’

96,6

193,2

Loxodon macrorhinus
Pseudupeneus seychellensis
Priarcanthus hamrur
Lutjanus sebae

14.7

207

PT

54

25

4°50,5’

55°57’

3

6

Jellyfish

14.7

208

T

47

47

4°48‘

55°20’

32,7

5,45 per trap

Lethrinella miniatus
Lutjanus kasimira
Lethrinella variagatus

14.7

209

T

40-37

40-37

4°43,3’

55020r

6,1 5 traps

1,22 per trap

Spilotichthys picrus
Lutjanus sebae
Lutjanus sanguineus

15.7

210

LL

62

62

4°44,3’

55°20’

16,8

8,0

Loxodon macrorhinus

15.7

211

BT

59

59

4°51,6’

55°05’

3

4

Sphyraena obtusata

15.7

212

BT

60-57

60-57

4°52,8’

55°05’

101,2

151,8

Nemipterus peroni
Saurida undosquamis

15.7

213

T

34-22

34-22

4°50,2’

54°38,2’

43,9

7,32 per trap

Lethrinella variegatus

15.7

214

T

46-36

46-36

4°49,6’

54°40,4’

2,5

0,42 per trap

Lutjanus sanguineus

15.7

215

LL

40-48

40-48

4°49,5’

54°40,7’

40,4

20,0 per 100 hook

Carcharhinus albimarguatus
Lutjanus sanguineus

16.7

216

BT

43-47

43-47

5°00’

55°27,3’

90,3

180,6

Loxodon macrorhinus
Saurida undosquamis

17.7

217

BT

52-54

52-54

5°00,4’

56°36,8’

65,7

131,4

Saurida undosquamis
Abalistes stellaris

17.7

218

PT

29-31

20

5°10’

56°24,4’

0

0


17.7

219

BT

56

56

5°10,5’

55°53,4’

174,9

349,8

Saurida undosquamis

17.7

220

PT

55

5-20

5°10,3’

55°54,2’

152,3

304,6

Decapterus spp. (juv.)

17.7

221

PT

50

20

5°10’

55°35’

13,9

20,85

Loxodon macrohinus

18.7

222

BT

50

50

5°10,1’

55028,64

98,8

197,6

Abalistes stellaris
Lutjanus sebae

19.7

223

PT

40-42

0-15

5°20’

55°58,7’

3,6

6,17

Jellyfish

19.7

224

HL

46

46

5°18,5’

56°14’

1,1

1,65

Epinephellus chlorostigma

19.7

225

BT

39

39

5°18,44’

56°16,34’

553,2

1106,4*

Lutjanus linedatus
Carcharhinus leucas (*not weighed, total length=265cm)

19. 7

226

PT

60

40

5°20,8’

56°16,34’

0

0

3 kg jellyfish

19.7

227

PT

60-67

35

5°30,6'

56°58’

121,3

196,7

Decapterus macrosoma

20.7

228

BT

57

57

5°30,37’

56°25,44’

0

0

10 kg jellyfish

20.7

229

PT

37

20

5°30’

56°17’

0

0

few Decapterus sp. juv.

20.7

230

BT

54

54

5°39,8’

56°23,8’

54,2

108,4

Lutjanus sebae

21.7

231

PT

1000

8-20

5°29’

55°58’

450

1800

Decapterus spp. juv.

23.7

232

BT

58

58

4°41’

56°10’

92

184

Saurida undosquamis

23.7

233

PT

50

15-27

4°33,8’

56°13,3’

46

92

Decapterus maruadsi

24.7

234

PT

63

18-32

4°00,1’

54°48,16’

23,6

31,47

Decapterus maruadsi

25.7

235

PT

?

100

3°52’

54°32’

2

4,8


25.7

236

BT

50-57

50-57

3°52’

55°36’

82,3

164,6

Lutjanus sebae
Pseudupeneus seychellensis

25.7

237

PT

62-64

20-30

4°10’

55°22’

52

62,4

Decapterus macrosoma

26.7

238

PT

63

0-15

4°32,74’

55°16,22’

0

.0


26.7

239

PT

67

10-20

4°33,62’

55°14,38’

0

0


26.7

240

T

50

50

4°29’

54°51,8’

18,4

3,07 per trap

Lethrinella miniatus

26.7

241

T

55

55

4°29,14’

5 4°52,8‘

23,1

3,85 per trap

Lutjanus sebae
Lethrinella miniatus

26.7

242

PT

23-50

15

4°27'

54°32’

4,7

8,06

Loxodon macrorhinus

27.7

243

PT

48-52

15-20

4°34'

54°47,5’

396,2

1188,6

Decapterus sp. juv.


Table no 2. Length distribution and maturity stage of the most important species. Ordinary scale 1-50 cm. x scale from 51-100 cm.

Fig. 1. Survey grid and stations. Broken line indicates the edge of the plateau.

Fig. 2. Surface current observations calculated from the drift of the vessel by means of Magnavox Satellite navigation.

Fig. 3. Vertical distribution of temperature, salinity and oxygen at Section I.

Fig. 4. Vertical distribution of temperature, salinity and oxygen at Section II.

Fig. 5. Vertical distribution of temperature, salinity and oxygen at Section III.

Fig. 6. Pelagic fish recordings and the temperature at 3 m depth.

Fig. 7. Demersal fish recordings and depth of the thermocline.

Fig. 8. Areas with untrawlable bottom along the courselines.

Fig. 9. Recordings of plankton including fish larvae.

Fig. 10. Wet displacement volume of plankton from the hydrographical sections I - III.

Fig. 11. Total length frequency distributions of all catches of A) Lutjanus lineolatus, B) Pseudupeneus seychellensis and C) Saurida undosquamis. B) and C) are also divided by sex.

Fig. 12. Total length frequency distributions of Decapterus spp. at the different stations.

Fig. 13. Total length frequency distributions of all catches of adult (over 15.0 cm) Decapterus maruadsi, Decapterus macro-soma and Decapterus kurroides.


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