INIDEP Informe Técnico, 7: 1-19.

INIDEP Informe Técnico, 7: 1-19.

Irusta, G.; Perez, M.; Bambill, G.; Hernandez, D.R. 1996. Análisis de la eficiencia y del poder de pesca relativos entre los BIPs Dr. E.L. Holmberg y Cap. Oca Balda respecto de la merluza común (Merluccius hubbsi).
INIDEP Informe Técnico, 7: 1-19.

Efficiency coeficients and relative fishing power between Argentine research vessels “Cap. Oca Balda” and “Dr. E.L.Holmberg” are analyzed to estandarize the abundance indices expressed in density (t/mn2) and catch per hour (kg/h), obtained during hake surveys. A randomized complete blocks ANOVA was used where hauls corresponding to the “blocks” and vessels to the assembling factor. There were significative differences between the relative efficiencies of both vessels, being Dr. E.L.Holmberg more efficient than Cap. Oca Balda. The haul distance was calculated using two methods; a -loxodromic distance and b- haul duration multiplied hauling speed. The estimated values were 1.24 and 1.21 respectively. Nevertheless, the relative fishing power is not significative different statiscally. Then, the differences between both vessels depend on the “swept area”. The trawl net of the Cap. Oca Balda has a greater distance of wings than Dr. E.L. Holmberg and this fact compense the lower efficiency of the former resulting in similar catch per hour for both vessels. It is concluded that the density values should be standarized and it is not needed for the catch per hour.