Comparison of CPUE and CPUA of the dominant commercial fishes caught by bottom trawl net in different depth layers, Gulf of Oman, Sistan and Baluchistan Province

Abstract

Introduction: The study aimed to compare the catch composition, CPUE, and CPUA of
dominant commercial fishes caught by bottom trawl nets (Plan approved by the Fisheries
Organization) in different depth layers of The Gulf of Oman, Sistan and Baluchistan
Province.
Materials & Methods: This study was carried out during 2 sampling stages in September
and March 2018 (fishing seasons). Fishing operations were carried out periodically in layers
of 50 meters, 50 to 100 meters, and above 100 meters by the Avash industrial trawler
equipped with a bottom trawl net with a power of 2250 horsepower in 24 designated stations
(4 times of net hauling per day in 6 days).
Results: Based on the calculated CPUE and CPUA results in the first stage, a significant
difference was observed between the CPUE and CPUA amounts of John's snapper in the
first and second depth layers, and between the CPUE and CPUA amounts of Cobia in the
first and third depth layers (P<0.05). Javelin grunter (CPUE: 99.9±45 and CPUA:
2122.6±1132.2) in the first depth layer, black pomfret (CPUE: 53.6±28.7 and CPUA:
738.2±407) in the second deep layer, and longrakered trevally (CPUE: 89.9±40.2 and
CPUA: 1181.6±515.7) in the third deep layer had the highest amount of CPUE and CPUA.
In the second fishing stage, there was a significant difference between the amount of CPUE
and CPUA of the Javelin grunter, Talang queenfish, and Cobia in the second and third depth
layers (P<0.05). Javelin grunter (CPUE: 71.2±21.1 and CPUA: 1230.9±428.6) in the second
depth layer and longrakered trevally (CPUE: 44.5±9.9 and CPUA: 596.2±129.3) in the third
depth layer had the highest amount of CPUE and CPUA.
Conclusion: Based on the obtained results, the highest amount of CPUE and CPUA were
estimated in the first, third, and second depth layers in the first sampling stage, and in the
second and third depth layers in the second sampling stage, respectively.