ANNEX II. Description of instruments and fishing gear.

ACOUSTIC INSTRUMENTS

Two SIMRAD scientific echo sounders, 38 and 120 kHz, were used during the survey for estimation of fish density. In addition an Es 400 split beam sounder was used.

INSTRUMENT SETTINGS
	EK 400/38	EK 400/120	ES 400
Range	0-100 or 0-250	0-100	0-25 to 0-250
Trans.	High (5000 W NOM)	High (1250 W NOM)	EK/ES adapter
Bandwidth	3.3 kHz	3.3 kHz	3.5 kHz
Pulslength	1 ms	1 ms	1 ms
TVG	20 log R	20 log R	40 log R
Attenuator	20 dB	0	Fixed
Rec. gain	7	5
Transducer	8° × 8° ceramic or split beam	Ceramic	Split beam 10°

Presentation mode: Compensated

EK 400/38 was coupled to the digital integrator QD and to one analog integrator QM.

QD settings:	Gain 30dB, Threshold 10 to 26 mv.
QM settings:	Gain 20 dB x 10. Threshold 10.

EK 400/120 was coupled to the other QM Integrator. Gain 10 dB × 10. Threshold 0.

ES 400 was connected to an Epson printer for hardcopy of the size distribution diagram (histogram).

Calibration on standard copper sphere.

		Grand Canary 5.10 1986	Las Palmas 4.11 1986
EK 400/38 + split beam transduser:
SL + VR	=	135.9	135.8

Bottom trawl

1360 MESH PELAGIC TRAWL