Report on the comparative fishing trial between the Gadus Atlantica and Teleost

• Main Author: William G. Warren
• Other Authors: The Pennsylvania State University CiteSeerX Archives
• Format: Text
• Language: English
• Published: 1997
• Subjects: American plaice; cod; comparative fishing; conversion equations; Greenland halibut; redfish; witch flounder NAFO Sci. Coun. Studies; 29; 81–92; Greenland
• Online Access: http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.543.4308; http://archive.nafo.int/open/studies/s29/warren.pdf

Equations are developed for converting catches at length, of five major groundfish species, obtained by the RV Gadus Atlantica using 30 minute tows with Engel 145 High Lift otter trawl to RV Teleost equivalents (15 minutes tows with the Campelen 1800 shrimp trawl). Paired tows were employed and criteria developed for determining whether one vessel fished on a aggregation essentially missed by the other vessel; such pairs were omitted from the final analysis. Bootstrap distributions were used for estimating the precision of the conversions. Because the Campelen 1800 was more efficient at catching small fish than the Engel 145 and because of the current scarcity of larger fish, extrapolation in either direction beyond the ranges indicated cannot be justified.