Volume 16, Issue 4 (Winter 2025)
3 2025, 16(4): 1-12 |
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paighambari Y, nazmi A, ZARE P, Avakh Keysami M, Abbaspour Naderi3 R. Comparing the length frequency of commercial dominant fishes caught with bottom trawl nets in different depth layers of Oman Sea. 3 2025; 16 (4) :1-12
URL: http://jmb.ahvaz.iau.ir/article-1-993-en.html
URL: http://jmb.ahvaz.iau.ir/article-1-993-en.html
Fishing and Exploitation Department, College of Fisheries and Environment, Gorgan University of Agricultural Sciences and Natural Resources, Gorgan, Iran
Abstract: (129 Views)
The aim of this study was to compare the length frequency of commercially dominant fish caught by bottom trawl nets in different depth layers of Oman Sea. This study was carried out during 2 stages of sampling in the months of September 2018 and february 2020 (fishing seasons) in the waters of the Oman Sea. Sampling and fishing operations periodically in layers of 50 meters, 50 to 100 meters and above 100 meters by the Avash industrial trawler equipped with a bottom trawl with a power of 2250 horsepower in 24 designated stations (4 times of netting during 6 day) was done. Based on the results and according to the analysis of the data of this research, for more detailed monitoring, the investigated fishes were divided into two length groups. The percentage of fish in length group one (smaller fish) in Greater lizardfish (Saurida tumbil) in the depth layer above 100 meters (57%) is significantly less than the two another layers While the percentage of fish in length group two (larger fish) in the depth layer above 100 meters (43%) is much higher than the other two depth layers. In Javelin grunter(Pomadasys kaakan), the percentage of fish in length group one (smaller fish) in the depth layer above 100 meters (15%) is significantly lower than the other two layers. In the case that the percentage of fish in length group two (larger fish) in the depth layer of 100 meters (84%) is much higher than the other two depth layers. Regarding Yellowfin seabream (Acanthopagrus latus), the percentage of fish in length group one is smaller in the layer The depth of the bank of 100 meters (11%) is significantly lower than the other two layers. If the percentage of length group 2 fish (larger fish) in the depth layer of 100 meters (88%) is much higher than the other two depth layers, and also in Narrow- barred Spanish mackerel(Scomberomorus commerson), the percentage of fish in length group one (smaller fish) in the depth layer of 100 meters (18%) is significantly lower than the other two layers. while the percentage of fish in length group two (larger fish) in the depth layer of 100 meters (81%) is much higher than the other two depth layers. In the case of other species, no significant difference has been observed. Based on the general results of this study, it has been shown that the length frequency of some dominant commercial fish in different depth layers has a significant difference, especially the indicator species such as Greater lizardfish, Javelin grunter, Yellowfin seabream and Narrow- barred Spanish mackerel, but in the case of No significant difference was observed in other species.
Type of Study: Research |
Subject:
Fisheries
Received: 2023/08/28 | Accepted: 2025/08/20 | Published: 2025/01/24
Received: 2023/08/28 | Accepted: 2025/08/20 | Published: 2025/01/24
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