Haul duration experimental data set (0 & 30 minutes hauls)

In 2003 two experiments were carried out in the Bay of Biscay to compare catch numbers obtained in standard research 30-min hauls with those from 0-min hauls to determine the so called end effect. The end effect in trawl catches is defined as the proportion of the fish catch taken during shooting and hauling of the net, a period excluded from what is nominally referred to as haul duration. In 0-hauls the trawl was hauled as soon as the trawl geometry stabilized on the seabed. The trawl used was a beam trawl rigged as twin trawl. Overall 24 hauls were carried out, six 30-min and 18 0-min hauls. Average catch ratios (0-min/30-min hauls) ranged from 0.05 (s.d. 0.06) for sole to 0.34 (s.d. 0.64) for hake.

In 2003 two experiments were carried out in the Bay of Biscay to compare catch numbers obtained in standard research 30-min hauls with those from 0-min hauls to determine the so called end effect. The end effect in trawl catches is defined as the proportion of the fish catch taken during shooting and hauling of the net, a period excluded from what is nominally referred to as haul duration. In 0-hauls the trawl was hauled as soon as the trawl geometry stabilized on the seabed. The trawl used was a beam trawl rigged as twin trawl. Overall 24 hauls were carried out, six 30-min and 18 0-min hauls. Average catch ratios (0-min/30-min hauls) ranged from 0.05 (s.d. 0.06) for sole to 0.34 (s.d. 0.64) for hake.

Disciplines

Fisheries and aquaculture

Keywords

haul duration, trawl end effect, catchability

Location

47.2N, 45.3S, 0E, -2.5W

Devices

beam trawl and temperature sensor

Data

FileSizeFormatProcessingAccess
Read me file describing data format
1 KoTEXT
Station details for each haul
3 KoCSVProcessed data
Catch by species
14 KoCSVQuality controlled data
Length measurements by species
41 KoCSVProcessed data
How to cite
Battaglia Andre, Biais Gerard, Rochet Marie-Joelle, Trenkel Verena (2003). Haul duration experimental data set (0 & 30 minutes hauls). Seanoe. https://doi.org/10.17882/56531

Copy this text