5. FISHING EXPERIMENTS

A record of all fishing stations with total catch and main species composition is shown in Appendix II.

A total of 155 hauls were made. Their distribution on areas and the range and mean value of the five highest catches in the bottom trawl were (in tonnes per hour):

	Number of hauls		Catch 5 highest demersal
Area	Pelagic	Demersal	Range	Mean
Cumene - Porto Alexandre	19	10	0.9 - 8.0	3.5
Porto Alexandre - Benguela	2	2	0.2 - 1.4	0.8
Benguela - Luanda	19	23	1.0 - 1.7	1.3
Luanda - Cabinda	30	50	1.2 - 2.0	1.6

A total of 19 hauls were made on the slope of the shelf between abt 11°30’S and 10°S and between 8°30’S and 6°30’S where the fishing grounds of the Spanish shrimp fleet are located. Catches of shrimps ranged from 0 to 116 kg/hours trawling and of hake from 7 to 1500 kg, with mean catches of 27 kg of shrimp and 160 kg of hake. The hake by-catch ratio in the Spanish shrimp fishery is probably not as high as this especially in the light beam trawls used in shallower waters. But here the by-catch at times consists of juvenile fish. In deeper waters where hake is abundant and a heavier gear is used, the by-catch must be considerable.

Figure 1. Cruise track, hydrography and fishing stations south of 13°LS.

Figure 2. Cruise track, hydrography and fishing stations, Benguela to Luanda.

Figure 3. Cruise track and fishing stations, Luanda to Cabinda.

Figure 4. Cruise track, hydrography and fishing stations, Luanda to Cabinda.

Figure 5. Distribution of temperature, salinity and oxygen in hydrographical sections off Baia dos Tigres and Lobito.

LOBITO - 18 AUG 1985

BAIA DOS TIGRES - 14 AUG 1985

Figure 6. Distribution of temperature, salinity and oxygen in hydrographical sections off Pta das Palmeirinhas, Pta da Moita Seca and Cabinda.

CABINDA - 8 SEP 1985

PTA DA MOITA SECA - 5 SEP 1985

PTA DAS PALMEIRINHAS - 23-24 AUG 1985

Figure 7. Distribution of three categories of fish in the Baia dos Tigres area.

PELAGIC FISH 1

PELAGIC FISH 2

DEMERSAL FISH

Figure 8. Distribution of two categories of fish in the area between Baia dos Tigres and Benguela.

PELAGIC FISH 2

DEMERSAL FISH

Figure 9. Distribution of three categories of fish in the area between Benguela and Luanda.

PELAGIC FISH 1

PELAGIC FISH 2

DEMERSAL FISH

Figure 10. Distribution of three categories of fish in the area between Luanda and Cabinda.

PELAGIC FISH 1

PELAGIC FISH 2

DEMERSAL FISH