A new artificial reef design for octopus (Octopus vulgaris cuvier, 1797) in the Aegean sea and preliminary results
This study was carried out in the Gulf of 0zmir in the Aegean Sea between June 2006 and November 2008. The purpose was the creation of a new concept of the artificial reef for Octopus vulgaris, with a view to establishing new artificial reef sites to be used in the fisheries management of this speci...
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| Format: | Article |
| Language: | English |
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Universidade de São Paulo
2011-01-01
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| Series: | Brazilian Journal of Oceanography |
| Subjects: | |
| Online Access: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-87592011000500004 |
| _version_ | 1818919034996916224 |
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| author | Ali Ula Altan Lök F. Ozan Düzbastllar Aytaç Özgül Cengiz Metin |
| author_facet | Ali Ula Altan Lök F. Ozan Düzbastllar Aytaç Özgül Cengiz Metin |
| author_sort | Ali Ula |
| collection | DOAJ |
| description | This study was carried out in the Gulf of 0zmir in the Aegean Sea between June 2006 and November 2008. The purpose was the creation of a new concept of the artificial reef for Octopus vulgaris, with a view to establishing new artificial reef sites to be used in the fisheries management of this species (MPA, NTZ or fishing areas). First, the main characteristics of natural octopus nests were recorded (entrance width, length, etc.) by divers. These characteristics were used in the construction of new octahedral artificial reef blocks. The blocks were made of reinforced concrete, in a shape like that of an inverted pyramid, with an upper surface of 100x100x25 cm³ and a lower one of 60x60 cm². Four cylindrical holes each with two ellipsoidal openings were placed in one face and in the lateral edge of the octo-block, to serve as the entrances to the artificial nest. Each nest has a volume of 5000 cm³. Eighty octo-blocks were deployed as artificial reefs at 10 m from each other at 15 different depths at two sites by divers with the help of the winch of the R/V EGESUF. These artificial octo-reefs were censused by direct observation. Twenty-eight octopuses were sampled at the end of 25 dives. Minimum mantle length of the octopuses was 75 mm and the maximum 249 mm, with an average of 152.71 mm. The average total length was calculated to be 918.57 mm. The weight of the specimens was between 244 g and 7140 g with an average of 2335.43 g. The results showed that both sites were inhabited by octopuses coming from the artificial reefs, which used them as nests. These nests seem to have constituted special places for fisheries management and will permit the assessment of reserve areas or marine protection areas (MPA), thus opening up a new perspective for Turkish fisheries.<br>Este estudo foi realizado no golfo de 0zmir, no Mar Egeu, entre junho de 2006 e novembro de 2008. O objetivo foi uma nova concepção de recife artificial para Octopus vulgaris, visando o estabelecimento de novos locais a serem utilizados na gestão da pesca dessa espécie (MPA, NTZ ou zonas de pesca). Primeiramente foram consideradas as principais características dos ninhos naturais do polvo (largura da entrada, comprimento, etc.). A seguir essas características foram utilizadas na construção de novos blocos octaédricos de recifes artificiais. Os blocos foram feitos de concreto armado, assemelhando-se a uma pirâmide invertida, nas dimensões de 100x100x25 cm³ na face superior e 60x60 cm² na face inferior. Quatro furos cilíndricos, com duas aberturas elipsoidais, foram dispostos em uma só face e na borda lateral do octo-bloco, correspondendo às entradas do ninho artificial. Cada ninho tem um volume de 5000 cm³. Foram implantados 80 octo-blocos para servirem como recifes artificiais, guardando a distância de 10 m entre si, em 15 profundidades e em dois locais diferentes, com auxílio de mergulhadores e guincho do R/ V EGESUF. Esses recifes foram recenseados, utilizando-se o método de observação direta. Vinte e oito polvos foram amostrados ao final de 25 mergulhos. O comprimento mínimo do manto do polvo foi de 75 mm e o máximo de 249 mm, com média de 152,71 mm. O comprimento médio total foi determinado em 918,57 mm. O peso dos espécimes ficou entre 244 e 7140 g, com média de 2335,43 g. Os resultados mostram que ambos os locais foram sustentados pelos polvos provenientes dos recifes artificiais, que os utilizaram como ninhos. Esses ninhos parecem constituir locais especiais para manejo da pesca, e permitirão a avaliação de áreas de reserva ou áreas marinhas de proteção (MPA), abrindo, desta forma, novas perspectivas para a pesca turca. |
| first_indexed | 2024-12-20T00:59:27Z |
| format | Article |
| id | doaj.art-3d213f0b23584a65a65fc68650f09844 |
| institution | Directory Open Access Journal |
| issn | 1679-8759 1982-436X |
| language | English |
| last_indexed | 2024-12-20T00:59:27Z |
| publishDate | 2011-01-01 |
| publisher | Universidade de São Paulo |
| record_format | Article |
| series | Brazilian Journal of Oceanography |
| spelling | doaj.art-3d213f0b23584a65a65fc68650f098442022-12-21T19:59:01ZengUniversidade de São PauloBrazilian Journal of Oceanography1679-87591982-436X2011-01-0159spe12125A new artificial reef design for octopus (Octopus vulgaris cuvier, 1797) in the Aegean sea and preliminary resultsAli UlaAltan LökF. Ozan DüzbastllarAytaç ÖzgülCengiz MetinThis study was carried out in the Gulf of 0zmir in the Aegean Sea between June 2006 and November 2008. The purpose was the creation of a new concept of the artificial reef for Octopus vulgaris, with a view to establishing new artificial reef sites to be used in the fisheries management of this species (MPA, NTZ or fishing areas). First, the main characteristics of natural octopus nests were recorded (entrance width, length, etc.) by divers. These characteristics were used in the construction of new octahedral artificial reef blocks. The blocks were made of reinforced concrete, in a shape like that of an inverted pyramid, with an upper surface of 100x100x25 cm³ and a lower one of 60x60 cm². Four cylindrical holes each with two ellipsoidal openings were placed in one face and in the lateral edge of the octo-block, to serve as the entrances to the artificial nest. Each nest has a volume of 5000 cm³. Eighty octo-blocks were deployed as artificial reefs at 10 m from each other at 15 different depths at two sites by divers with the help of the winch of the R/V EGESUF. These artificial octo-reefs were censused by direct observation. Twenty-eight octopuses were sampled at the end of 25 dives. Minimum mantle length of the octopuses was 75 mm and the maximum 249 mm, with an average of 152.71 mm. The average total length was calculated to be 918.57 mm. The weight of the specimens was between 244 g and 7140 g with an average of 2335.43 g. The results showed that both sites were inhabited by octopuses coming from the artificial reefs, which used them as nests. These nests seem to have constituted special places for fisheries management and will permit the assessment of reserve areas or marine protection areas (MPA), thus opening up a new perspective for Turkish fisheries.<br>Este estudo foi realizado no golfo de 0zmir, no Mar Egeu, entre junho de 2006 e novembro de 2008. O objetivo foi uma nova concepção de recife artificial para Octopus vulgaris, visando o estabelecimento de novos locais a serem utilizados na gestão da pesca dessa espécie (MPA, NTZ ou zonas de pesca). Primeiramente foram consideradas as principais características dos ninhos naturais do polvo (largura da entrada, comprimento, etc.). A seguir essas características foram utilizadas na construção de novos blocos octaédricos de recifes artificiais. Os blocos foram feitos de concreto armado, assemelhando-se a uma pirâmide invertida, nas dimensões de 100x100x25 cm³ na face superior e 60x60 cm² na face inferior. Quatro furos cilíndricos, com duas aberturas elipsoidais, foram dispostos em uma só face e na borda lateral do octo-bloco, correspondendo às entradas do ninho artificial. Cada ninho tem um volume de 5000 cm³. Foram implantados 80 octo-blocos para servirem como recifes artificiais, guardando a distância de 10 m entre si, em 15 profundidades e em dois locais diferentes, com auxílio de mergulhadores e guincho do R/ V EGESUF. Esses recifes foram recenseados, utilizando-se o método de observação direta. Vinte e oito polvos foram amostrados ao final de 25 mergulhos. O comprimento mínimo do manto do polvo foi de 75 mm e o máximo de 249 mm, com média de 152,71 mm. O comprimento médio total foi determinado em 918,57 mm. O peso dos espécimes ficou entre 244 e 7140 g, com média de 2335,43 g. Os resultados mostram que ambos os locais foram sustentados pelos polvos provenientes dos recifes artificiais, que os utilizaram como ninhos. Esses ninhos parecem constituir locais especiais para manejo da pesca, e permitirão a avaliação de áreas de reserva ou áreas marinhas de proteção (MPA), abrindo, desta forma, novas perspectivas para a pesca turca.http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-87592011000500004PolvoOctopus vulgarisOcto-recifes artificiaisMar EgeuGestão da pescaMPA: Área de Proteção Marinha, NTZ: Área de Restrição da PescaOctopusOctopus vulgarisArtificial Octo-reefsAegean SeaFisheries managementMPA: Marine protected area, NTZ: No Take ZoneZone |
| spellingShingle | Ali Ula Altan Lök F. Ozan Düzbastllar Aytaç Özgül Cengiz Metin A new artificial reef design for octopus (Octopus vulgaris cuvier, 1797) in the Aegean sea and preliminary results Brazilian Journal of Oceanography Polvo Octopus vulgaris Octo-recifes artificiais Mar Egeu Gestão da pesca MPA: Área de Proteção Marinha, NTZ: Área de Restrição da Pesca Octopus Octopus vulgaris Artificial Octo-reefs Aegean Sea Fisheries management MPA: Marine protected area, NTZ: No Take ZoneZone |
| title | A new artificial reef design for octopus (Octopus vulgaris cuvier, 1797) in the Aegean sea and preliminary results |
| title_full | A new artificial reef design for octopus (Octopus vulgaris cuvier, 1797) in the Aegean sea and preliminary results |
| title_fullStr | A new artificial reef design for octopus (Octopus vulgaris cuvier, 1797) in the Aegean sea and preliminary results |
| title_full_unstemmed | A new artificial reef design for octopus (Octopus vulgaris cuvier, 1797) in the Aegean sea and preliminary results |
| title_short | A new artificial reef design for octopus (Octopus vulgaris cuvier, 1797) in the Aegean sea and preliminary results |
| title_sort | new artificial reef design for octopus octopus vulgaris cuvier 1797 in the aegean sea and preliminary results |
| topic | Polvo Octopus vulgaris Octo-recifes artificiais Mar Egeu Gestão da pesca MPA: Área de Proteção Marinha, NTZ: Área de Restrição da Pesca Octopus Octopus vulgaris Artificial Octo-reefs Aegean Sea Fisheries management MPA: Marine protected area, NTZ: No Take ZoneZone |
| url | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-87592011000500004 |
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