scholarly journals Changes in seawater nutrient concentrations during purse seine fishing for sardine Sardina pilchardus off northern Portugal

2003 ◽  
Vol 265 ◽  
pp. 235-242 ◽  
Author(s):  
Y Stratoudakis ◽  
A Marçalo ◽  
C Vale ◽  
M Falcão
Keyword(s):  
Purse Seine ◽  
Nutrient Concentrations ◽  
Sardina Pilchardus ◽  
Northern Portugal

scholarly journals Fishing simulation experiments for predicting the effects of purse-seine capture on sardine (Sardina pilchardus)

2009 ◽  
Vol 67 (2) ◽  
pp. 334-344 ◽  
Author(s):  
Ana Marçalo ◽  
Tiago A. Marques ◽  
João Araújo ◽  
Pedro Pousão-Ferreira ◽  
Karim Erzini ◽  
...  
Keyword(s):  
Survival Rates ◽  
Purse Seine ◽  
Commercial Fishing ◽  
Sardina Pilchardus ◽  
Simulation Experiments ◽  
Mean Values ◽  
Negative Effect ◽  
Dead Fish ◽  
Delayed Mortality ◽  
The Impact

Abstract Marçalo, A., Marques, T. A., Araújo, J., Pousão-Ferreira, P., Erzini, K., and Stratoudakis, Y. 2010. Fishing simulation experiments for predicting the effects of purse-seine capture on sardine (Sardina pilchardus). – ICES Journal of Marine Science, 67: 334–344. To study the impact of purse-seine fishing on deliberately released sardine, two laboratory experiments were performed to explore the effect of net confinement for 10, 20, 40, and 60 min at 18 and 23°C. A third experiment considered two levels of fish density while confined for 20 and 40 min at 16°C. Analysis of cortisol and haematocrit demonstrated that stress immediately after simulated fishing was milder than in commercial fishing and did not correlate with observed delayed mortality. Scale loss was related to the probability of dying (mean values of 16.3 and 2% for dead fish and survivors, respectively), and fin erosion was a long-term stress response observed in both dead and surviving fish. Time of confinement was an important stressor, with survival rates decreasing significantly with increasing periods in the net, and temperature having an additional negative effect. Density effects were less conclusive, but there was some indication that survival correlated with biological condition (heavier fish were more likely to survive). It seems that delayed mortality after release can be substantial, although death is not certain and appropriately modified fishing operations and favourable environmental conditions may enhance the probability of sardine survival.

scholarly journals Species diversity and dominancy indexes in Izmir Bay (Aegean Sea) purse seine fishery

2020 ◽  
Vol 37 (4) ◽  
pp. 353-356
Author(s):  
Ahmet Mert Senbahar ◽  
Özlem Güleç ◽  
Zafer Tosunoglu
Keyword(s):  
Dominant Species ◽  
Diversity Index ◽  
Aegean Sea ◽  
Purse Seine ◽  
Total Biomass ◽  
Sardina Pilchardus ◽  
Izmir Bay ◽  
Bony Fishes ◽  
Sardinella Aurita ◽  
Purse Seine Fishery

To determine the diversity index values of species caught by purse seine, all samplings were carried out between September 2, 2017, and April 6, 2018 in Izmir Bay. As a result, a total of 17 fish species (Osteichthyes) belonging to 11 families and also 2 species from invertebrates (Cephalopoda and Arthropoda) were determined. Bony fishes and invertebrates consist of 99.9% and 0.1% of the total biomass, respectively. Sardina pilchardus was the most dominated species that occupied as 80.2% of the overall bony fishes followed by Engraulis encrasicolus (14.6%) and Sardinella aurita (1.5%). Diversity index values of species were found-1.026 by Shannon-Weaver and 0.63 by Simpsons, respectively. The highest dominancy was found for S. pilchardus with 71.1%. Overall final results indicate that the diversity of species in Izmir Bay purse seine fishery is very low and also S. pilchardus is the most over-dominant species.

scholarly journals Effects of Lunar Phases and Other Variables on CPUE of European Pilchard, Sardina pilchardus, Caught by Purse Seine in the Eastern Mediterranean

2021 ◽  
Vol 21 (06) ◽  
pp. 283-290
Author(s):  
Zafer Tosunoglu ◽  
Tevfik Ceyhan ◽  
Ozlem Gulec ◽  
Faik Ozan Duzbastilar ◽  
Muharrem Hakan Kaykac ◽  
...  
Keyword(s):  
Eastern Mediterranean ◽  
Aegean Sea ◽  
Purse Seine ◽  
Sardina Pilchardus ◽  
Lunar Phases ◽  
Pelagic Fishes ◽  
The Mean ◽  
The Impact ◽  
Fishing Area ◽  
Purse Seine Fishery

European pilchard Sardina pilchardus (Walbaum, 1792) is one of the most dominant small pelagic landed by purse seine in Turkey as well as Mediterranean. In this study, we aimed to identify relationships between the seasonally adjusted CPUE and changes of the sea surface temperature (SST), fishing area, moon phase, and light used in the purse seine fishery to understand the impact of changes on the CPUE of pelagic fishes, especially S. pilchardus, by a total of 214 operations in Izmir Bay, Aegean Sea. The effect of the parameters on the Sardine CPUE, expressed in terms of kg (haul day)–1, was examined by means of the Generalized Additive Modelling (GAMs) techniques. The CPUE values for S. pilchardus were between 0 – 16 800 kg (haul day)–1 and the mean CPUE was 1 844.3±176.6 kg (haul day)–1 . The smallest median was 441 kg (haul day)–1 for full moon and the differences between the CPUE values of lunar phases were statistically significant (p<0.05). Furthermore, there is a linear relationship between CPUE and SST. In conclusion, the CPUE varied under hydrographic variables mostly SST for sardine purse seine fishery in the Aegean Sea.

scholarly journals Reconstructing discards profiles of unreported catches

2018 ◽  
Vol 82 (S1) ◽  
pp. 39 ◽  
Author(s):  
Francisco Leitão ◽  
Vânia Baptista ◽  
Karim Erzini
Keyword(s):  
Purse Seine ◽  
Artisanal Fisheries ◽  
Sardina Pilchardus ◽  
Merluccius Merluccius ◽  
Liza Aurata ◽  
Scomber Colias ◽  
Boops Boops ◽  
Trawl Fisheries ◽  
Belone Belone ◽  
Unreported Catches

In Portugal it has been estimated that unreported catches represent one third of total catches. Herein, information on landings and total unreported catches (discards) by commercial métier were disaggregated into high taxonomic detail using published scientific studies. Fish accounted for 93.5% (115493 t) of overall unreported catches per year, followed by cephalopods (2345 t, 1.9%) and crustaceans (1754 t, 1.4%). Sharks accounted for 1.3% of total unreported catches in weight (1638 t/y). Unreported taxa consisted mostly of the commercial landed fish species: Scomber colias, Boops boops, Trachurus picturatus, T. trachurus, Merluccius merluccius, Sardina pilchardus, Liza aurata and Micromesistius poutassou, which together accounted for 70% of the unreported discarded catches. The number of unreported/discarded species was highest in artisanal fisheries, followed by trawl and purse seine. In artisanal fisheries, L. aurata, S. colias, S. pilchardus, Trachinus draco and B. boops accounted for 76.4% of the unreported discards. B. boops, S. colias and S. pilchardus were also among the most discarded purse seine species, together with Belone belone accounting for 79% of the unreported catches. In trawl fisheries, T. picturatus (16%), M. merluccius (13%), S. colias (13%) and M. poutassou (13%) accounted for 55% of the trawl discarded unreported catches. The discarded species that most contribute to overall unreported catches are those that are most frequently landed and that most contribute to overall landings in weight.

scholarly journals Effects of different slipping methods on the mortality of sardine, Sardina pilchardus, after purse-seine capture off the Portuguese Southern coast (Algarve)

PLoS ONE ◽  
2018 ◽  
Vol 13 (5) ◽  
pp. e0195433 ◽  
Author(s):  
Ana Marçalo ◽  
Pedro M. Guerreiro ◽  
Luís Bentes ◽  
Mafalda Rangel ◽  
Pedro Monteiro ◽  
...  
Keyword(s):  
Purse Seine ◽  
Sardina Pilchardus ◽  
Southern Coast

Sardine (Sardina pilchardus) stress reactions to purse seine fishing

2006 ◽  
Vol 149 (6) ◽  
pp. 1509-1518 ◽  
Author(s):  
Ana Marçalo ◽  
Luísa Mateus ◽  
José Henrique Duarte Correia ◽  
Pedro Serra ◽  
Rob Fryer ◽  
...  
Keyword(s):  
Purse Seine ◽  
Stress Reactions ◽  
Sardina Pilchardus

Behavioural responses of sardines Sardina pilchardus to simulated purse-seine capture and slipping

2013 ◽  
Vol 83 (3) ◽  
pp. 480-500 ◽  
Author(s):  
A. Marçalo ◽  
J. Araújo ◽  
P. Pousão-Ferreira ◽  
G. J. Pierce ◽  
Y. Stratoudakis ◽  
...  
Keyword(s):  
Purse Seine ◽  
Sardina Pilchardus ◽  
Behavioural Responses

scholarly journals Retention probability of purse seine grating sieve based on fish morphology

2021 ◽  
Vol 38 (2) ◽  
pp. 173-180
Author(s):  
Zafer Tosunoğlu ◽  
Sinan Mavruk ◽  
Nazlı Kasapoğlu
Keyword(s):  
Simulated Data ◽  
Aegean Sea ◽  
Purse Seine ◽  
Maximum Height ◽  
Sardina Pilchardus ◽  
Maximum Width ◽  
Engraulis Encrasicolus ◽  
Sardinella Aurita ◽  
First Maturity ◽  
Boops Boops

The retention-releasing patterns of the double-grid grating sieve placed on the deck of the purse seiners were revealed for four case species (Sardina pilchardus, Sardinella aurita, Engraulis encrasicolus and Boops boops) using a simulated data predicted from total length (TL) – maximum height (Hmax) and TL – maximum width (Wmax) regressions. To calculate these relationships, samples were collected during commercial purse seine operations between 3 April 2017 and 21 March 2018 in Izmir Bay, Aegean Sea (Turkey). Optimal Bar Spacing (OBS) values corresponding to minimum landing sizes or the length at first maturity were calculated separately for each species. OBS values were found 10.97 mm for sardine (Sardina pilchardus), 11.29 mm for round sardine (Sardinella aurita), 7.78 mm for anchovy (Engraulis encrasicolus) and 17.89 mm for bogue (Boops boops). The bar spacing regulations may constitute a promising management measure to release undersized fish for the purse seine fishery in the Aegean Sea.

Sign in / Sign up

Export Citation Format

Share Document