Portuguese purse seine fishery spatial and resource overlap with top predators

2019 ◽  
Vol 617-618 ◽  
pp. 183-198 ◽  
Author(s):  
L Wise ◽  
C Galego ◽  
I Katara ◽  
A Marçalo ◽  
A Meirinho ◽  
...  
2018 ◽  
Vol 59 (2) ◽  
pp. 185-190
Author(s):  
Barbara Zorica ◽  
Vanja Čikeš Keč ◽  
Kristijan Zanki ◽  
Leon Grubišić ◽  
Tanja Šegvić-Bubić

Due to very good collaboration with one commercial purse seiner, using “Srdelara” and operating in fishing zone G, preliminary data concerning the interaction between small pelagic purse seine fishery and its predators were obtained. According to the notes taken by experience observer on-board in period from year 2013 to 2016, seems that tunas, dolphins and swordfish were the faithful companions of purse seiner fisherman with abundance of 68.6%, 22.0% and 9.4%, respectively. Although they were present all year round, their monthly pattern of appearance indicated that less tunas were recorded in May-June, more dolphins were noted from July to October while swordfish were mostly abundant in winter (January-March). Within the investigated period, slightly increasing trend of tuna and dolphins’ appearance was recorded, although statistically not significant. Analysing possible correlation between purse seine catches and predator’s abundances, revealed that appearance of tuna had negative impact on the catches (dispersion of schools), while realised catches in presence of dolphins were quite good so it seems that they tend to round up small pelagic fish schools.


2021 ◽  
Vol 241 ◽  
pp. 106001
Author(s):  
Osman Crespo-Neto ◽  
Eric Díaz-Delgado ◽  
Tatiana A. Acosta-Pachón ◽  
Raúl O. Martínez-Rincón

2021 ◽  
Vol 239 ◽  
pp. 105951
Author(s):  
Jon Ruiz ◽  
Maite Louzao ◽  
Iñaki Oyarzabal ◽  
Luis Arregi ◽  
Estanis Mugerza ◽  
...  

2019 ◽  
Vol 6 ◽  
Author(s):  
Rafael Schroeder ◽  
Angelica Petermann ◽  
Alberto Correia ◽  
Paulo Schwingel

2019 ◽  
Vol 41 (4) ◽  
pp. 373-383
Author(s):  
R Tejerina ◽  
M Hermida ◽  
G Faria ◽  
J Delgado

2019 ◽  
Vol 23 (4) ◽  
pp. 171
Author(s):  
Bram Setyadji ◽  
Umi Chodriyah

Knowledge on seasonal fishing pattern is essential in fisheries research in order to increase the effectiveness of fishing and at the same time protecting the fishing ground from excessive fishing practices. Determining the seasonal fishing pattern of large pelagic fishes, namely large tuna (yellowfin and bigeye), small tuna (mackerel) and skipjack tuna were the objective of this study. Data from the 2013-2015 fishing operation time series were used to analyze the fishing season using the percentage average per unit effort (CPUE) method. The main focus of this study was purse seine fishery. The research showed that high fishing season of large pelagic fishes allegedly occurred during May to July, which reached its peak on May. On the other hand, low fishing season occurred during January to April, with the lowest on March. There were similarities between large tuna, small tuna and skipjack in term of their seasonal fishing pattern, although they did not show any good correlation (r<0.5). This might due to fact that even tough large tuna, small tuna and skipjack tuna shared the same ecological niche but apparently, they did not show any interaction (symbiosis) but competition.


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