The Effect of Seasons on Gill Net Selectivity
In this study, the aim was to investigate the seasonal variations in the selectivity of striped red mullet (Mullus surmuletus L., 1758) captured by gill nets during the year in the north Aegean Sea. Fisheries’ operations were carried out between August 2008 and August 2009. Gill nets with 18, 20, an...
Saved in:
| Main Authors: | , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Istanbul University Press
2019-10-01
|
| Series: | Aquatic Sciences and Engineering |
| Subjects: | |
| Online Access: | https://cdn.istanbul.edu.tr/file/JTA6CLJ8T5/C8A119857BE9440FBC0F31D6140AB2D7 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1849728710585876480 |
|---|---|
| author | Adnan Ayaz Uğur Altınağaç Alkan Öztekin Uğur Özekinci |
| author_facet | Adnan Ayaz Uğur Altınağaç Alkan Öztekin Uğur Özekinci |
| author_sort | Adnan Ayaz |
| collection | DOAJ |
| description | In this study, the aim was to investigate the seasonal variations in the selectivity of striped red mullet (Mullus surmuletus L., 1758) captured by gill nets during the year in the north Aegean Sea. Fisheries’ operations were carried out between August 2008 and August 2009. Gill nets with 18, 20, and 22 mm mesh sizes were used in the trials. These nets are widely used in the region. Gill nets were deployed three hours before sunset and were removed from the sea at sunset. Similarly, the nets were set up two hours before sunrise and hauled from the sea an hour after sunrise. The SELECT method was used to determine the selectivity of gill nets. The deviances from the SELECT method revealed that lognormal models gave the best fits for all seasons. As a result of the calculations made according to the lognormal model, the modal lengths of the gill nets were calculated as the shortest in the spring season and the longest in the summer. The spread values of the selectivity curves of the experimental gill nets were determined the lowest in the winter season and the highest in the summer season. As a result of selectivity analysis, the differences between the spring and summer season modal lengths of the nets were calculated as 1.5 cm, 1.65 cm, and 1.82 cm for the nets with 18 mm, 20 mm, and 22 mm mesh sizes, respectively. The study results showed that the fishing season was important in gill nets selectivity. |
| format | Article |
| id | doaj-art-66e7380517764c5ba29fd16f2c6db276 |
| institution | DOAJ |
| issn | 2602-473X |
| language | English |
| publishDate | 2019-10-01 |
| publisher | Istanbul University Press |
| record_format | Article |
| series | Aquatic Sciences and Engineering |
| spelling | doaj-art-66e7380517764c5ba29fd16f2c6db2762025-08-20T03:09:28ZengIstanbul University PressAquatic Sciences and Engineering2602-473X2019-10-0134411612110.26650/ASE2019575395123456The Effect of Seasons on Gill Net SelectivityAdnan Ayaz0https://orcid.org/0000-0003-4839-9244Uğur Altınağaç1https://orcid.org/0000-0002-3638-9834Alkan Öztekin2https://orcid.org/0000-0003-3914-9788Uğur Özekinci3https://orcid.org/0000-0003-2207-0168Çanakkale Onsekiz Mart Üniversitesi, Canakkale, TurkiyeÇanakkale Onsekiz Mart Üniversitesi, Canakkale, TurkiyeÇanakkale Onsekiz Mart Üniversitesi, Canakkale, TurkiyeÇanakkale Onsekiz Mart Üniversitesi, Canakkale, TurkiyeIn this study, the aim was to investigate the seasonal variations in the selectivity of striped red mullet (Mullus surmuletus L., 1758) captured by gill nets during the year in the north Aegean Sea. Fisheries’ operations were carried out between August 2008 and August 2009. Gill nets with 18, 20, and 22 mm mesh sizes were used in the trials. These nets are widely used in the region. Gill nets were deployed three hours before sunset and were removed from the sea at sunset. Similarly, the nets were set up two hours before sunrise and hauled from the sea an hour after sunrise. The SELECT method was used to determine the selectivity of gill nets. The deviances from the SELECT method revealed that lognormal models gave the best fits for all seasons. As a result of the calculations made according to the lognormal model, the modal lengths of the gill nets were calculated as the shortest in the spring season and the longest in the summer. The spread values of the selectivity curves of the experimental gill nets were determined the lowest in the winter season and the highest in the summer season. As a result of selectivity analysis, the differences between the spring and summer season modal lengths of the nets were calculated as 1.5 cm, 1.65 cm, and 1.82 cm for the nets with 18 mm, 20 mm, and 22 mm mesh sizes, respectively. The study results showed that the fishing season was important in gill nets selectivity.https://cdn.istanbul.edu.tr/file/JTA6CLJ8T5/C8A119857BE9440FBC0F31D6140AB2D7seasonsgill netselectivityselect methodaegean sea |
| spellingShingle | Adnan Ayaz Uğur Altınağaç Alkan Öztekin Uğur Özekinci The Effect of Seasons on Gill Net Selectivity Aquatic Sciences and Engineering seasons gill net selectivity select method aegean sea |
| title | The Effect of Seasons on Gill Net Selectivity |
| title_full | The Effect of Seasons on Gill Net Selectivity |
| title_fullStr | The Effect of Seasons on Gill Net Selectivity |
| title_full_unstemmed | The Effect of Seasons on Gill Net Selectivity |
| title_short | The Effect of Seasons on Gill Net Selectivity |
| title_sort | effect of seasons on gill net selectivity |
| topic | seasons gill net selectivity select method aegean sea |
| url | https://cdn.istanbul.edu.tr/file/JTA6CLJ8T5/C8A119857BE9440FBC0F31D6140AB2D7 |
| work_keys_str_mv | AT adnanayaz theeffectofseasonsongillnetselectivity AT uguraltınagac theeffectofseasonsongillnetselectivity AT alkanoztekin theeffectofseasonsongillnetselectivity AT ugurozekinci theeffectofseasonsongillnetselectivity AT adnanayaz effectofseasonsongillnetselectivity AT uguraltınagac effectofseasonsongillnetselectivity AT alkanoztekin effectofseasonsongillnetselectivity AT ugurozekinci effectofseasonsongillnetselectivity |