NALS OF THE SOUTH AFRICAN MUSEUM

ALE VAN DIE SUID-AFRIKAANSE MUSEUM

Volume 72 ~~ Band

March 1977 Maart

Part 8 Deel

THE SOUTH AFRICAN MUSEUM’S

MEIRING NAUDE CRUISES

PART 1

STATION DATA 1975, 1976

Compiled by

ELIZABETH LOUW

Cape Town Kaapstad

The ANNALS OF THE SOUTH AFRICAN MUSEUM

are issued in parts at irregular intervals as material

becomes available

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Trustees of the South African Museum © Trustees van die Suid-Afrikaanse Museum

1977

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Printed in South Africa by In Suid-Afrika gedruk deur

The Rustica Press, Pty., Ltd., Die Rustica-pers, Edms., Bpk.,

Court Road, Wynberg, Cape Courtweg, Wynberg, Kaap

THE SOUTH AFRICAN MUSEUM’S MEIRING NAUDE CRUISES

PART 1

STATION DATA 1975, 1976

Compiled by

ELIZABETH LoUW

South African Museum, Cape Town

(With | figure and 3 tables)

LMS. accepted 30 November 1976]

CONTENTS

PAGE

Introduction ; 2 : 5 : ; 147

The cruises . ‘ : ; : 3 : 147

Acknowledgements . : : : ; 159

References . : : : : j a) Se)

INTRODUCTION

The benthic and pelagic fauna of the continental shelf of South Africa

has received a fair amount of attention in recent years, from the University of

Cape Town, the Sea Fisheries Branch of the Department of Industries, the

Oceanographic Research Institute, Durban, and the South African Museum.

The fauna of the deeper waters of 500 metres and more, however, especially

off Natal, has received less attention. This area, being the western edge of the

Indo-Pacific region and a corridor for the Agulhas Current, is of particular

interest to marine zoogeographers.

To remedy this situation the staff of the Department of Marine Biology of

the South African Museum has embarked on an investigatory programme in

the area. With the limited financial resources at the Museum’s disposal it

became obvious that seasonal and quantitative studies would not at first be

possible. The 1975 and 1976 cruises are thus regarded as qualitative and

exploratory in nature. Nevertheless, as both cruises covered much the same

area at the same time of year, valuable commentary can be made on the general

composition of the fauna.

THE CRUISES

With the aid of grants from the South African National Council for

Oceanographic Research (SANCOR) and with assistance from the South

African Museum, two ten-day cruises were undertaken. These took place

from 22 to 31 May 1975 and from 17 to 26 May 1976 on board the Durban-

based C.S.I.R. research vessel Meiring Naude. A total of 115 stations was

147

Ann. S. Afr. Mus. 72 (8), 1977: 147-159, 1 fig., 3 tables.

148 ANNALS OF THE SOUTH AFRICAN MUSEUM

30° 40" 50" 32° 10° 20° 0a

SOUTH A

AFRICA ee

88

28

2 |

40)

30) a0)

40) Pe

| DURBAN i

50 3Pr 10° 20 30 20 50 37 10 20 30 ry 50 33° 10 20°

Fig. 1. Chart of the area sampled during the 1975 (stations SM 1-50) and 1976 (stations

SM 51-115) cruises of the South African Museum on the R/V Meiring Naude.

THE SOUTH AFRICAN MUSEUM’S MEIRING NAUDE CRUISES 149

occupied, designated by the prefix ‘SM’, from 26°51’S to 29°49’S (see Fig. 1),

in bottom depths ranging from 18 to 1 400 metres. Most of the stations were in

depths of more than 600 metres.

The following gear was employed:

Indian Ocean Standard Net (IOSN)

NI1OOH net

BS7 Bongo net (0,505 mm mesh) (King & Robertson 1973)

Neuston net

10 ft (3,048 m) Isaacs-Kidd midwater trawl (IKMT) (King & Iversen

1962)

8 m? Rectangular midwater trawl (RMT) (fixed open mouth) (Clarke

1969; Baker, Clarke & Harris 1973)

18 ft (5,486 m) Beam trawl

Agassiz trawl

Heavy steel dredge

Light biological dredge (Menzies 1962).

The biological material collected is housed in the South African Museum,

with duplicate fish material in the J. L. B. Smith Institute of Ichthyology,

Grahamstown.

Animal groups not yet being dealt with include Gasteropoda, Pelecypoda,

Scaphopoda, Brachiopoda, Anthozoa, Euphausiacea, Mysidacea, Tanaidacea,

sponges, Polyzoa, and most of the planktonic groups. Information on the com-

position, size and availability of these groups may be obtained from the Head

of the Department of Marine Biology, South African Museum.

All station data are contained in the following tables. Papers dealing with

various collections from the 1975 and 1976 cruises will give station numbers

only, and will refer to the present paper for further data.

NOTES FOR TABLES | & 2

Bathythermograph column indicates the depth range (m) over which temperature profiles

were obtained using an electronic temperature/depth Underwater Instrument (Snyman 1976).

Table 3 provides temperature data from these profiles for selected depths.

S, D & N following SM numbers, e.g. SM 51S, SM 51D and SM SIN, indicate shallow

Bongo, deep Bongo and Neuston net hauls respectively, at the same station.

* Ship’s speed at 0 knots for most of haul due to drag on net.

** Bathythermograph damaged—temperature data was obtained for depths 1 000-640 m

only.

+ Refer to Bathythermograph for previous station.

+? Refer to Bathythermograph for the following station.

¢ RMT was fished in a stepped haul. Sea surface temperature and ship’s speed are averaged

for the complete haul.

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ACKNOWLEDGEMENTS

The Trustees of the South African Museum wish to thank SANCOR

for two generous grants which made the cruises possible; also Captain G. Foulis

and the crew of the R/V Meiring Naude for their kind assistance, and for the

efficient running of both cruises; Mr P. Slevin of the National Research

Institute for Oceanology, Durban, who accompanied both cruises as hydro-

graphic technician; Mr A. Noyce of the University of Stellenbosch and

Mr W. Holleman of the J. L. B. Smith Institute of Ichthyology, Grahamstown,

who accompanied the second cruise; the Sea Fisheries Branch, Sea Point,

for the loan of Bongo nets; the Oceanographic Research Institute, Durban,

for the loan of a beam trawl; the University of Cape Town for the loan of an

Indian Ocean Standard Net; and Mr D. Moore of the Sea Fisheries Branch

for assistance in the construction of the RMT and the light biological dredge.

REFERENCES

BAKER, A. de C., CLARKE, M. R. & Harris, M. J. 1973. The N.I.O. combination net (RMT

1+8) and further developments of rectangular midwater trawls. J. mar. biol. Assoc. U.K.

53: 167-184.

CLARKE, M. R. 1969. A new midwater trawl for sampling discrete depth horizons. J. mar.

biol. Assoc. U.K. 49: 945-960.

KING, D. P. & RoperTson, A. A. 1973. Methods of pelagic fish egg and larval research in

South West Africa. S. Afr. Shipp. News Fish. Ind. Rey. 28: 57-61.

Kina, J. E. & Iversen, R. T. 1962. Midwater trawling for forage organisms in the Central

Pacific. 1951-1956. Bull. Fish. Wildl. Serv. U.S. 62: 270-321.

Menzies, R. J. 1962. The isopods of abyssal depths in the Atlantic Ocean. Vema Res. Ser.

1: 79-206.

SNYMAN, C. G. 1976. Automatic data acquisition systems on board the research vessel, ‘Meiring

Naude’. Jn: Interdisciplinary Conference on Marine and Freshwater Research in Southern

Africa, 5-10 July 1976: Fiche 8 E13—G11. Port Elizabeth: University, 1976.

WN

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