Merluccius hubbsi (Teleostei: Merlucciidae): stock identification based on reproductive biology in the south-southeast brazilian region
The Argentine hake, Merluccius hubbsi, a demersal-pelagic species found from Rio de Janeiro, Brazil to the Tierra del Fuego, Argentina, has become an important target of the Brazilian bottom-trawler fleet since 2001. Earlier studies focusing on the species have suggested that more than one stock mig...
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| Format: | Article |
| Language: | English |
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Universidade de São Paulo
2009-03-01
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| Series: | Brazilian Journal of Oceanography |
| Subjects: | |
| Online Access: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-87592009000100003 |
| _version_ | 1818365554526781440 |
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| author | André Martins Vaz-dos-Santos Carmen Lúcia Del Bianco Rossi-Wongtschowski José Lima de Figueiredo |
| author_facet | André Martins Vaz-dos-Santos Carmen Lúcia Del Bianco Rossi-Wongtschowski José Lima de Figueiredo |
| author_sort | André Martins Vaz-dos-Santos |
| collection | DOAJ |
| description | The Argentine hake, Merluccius hubbsi, a demersal-pelagic species found from Rio de Janeiro, Brazil to the Tierra del Fuego, Argentina, has become an important target of the Brazilian bottom-trawler fleet since 2001. Earlier studies focusing on the species have suggested that more than one stock might occur off the Brazilian coast, in accordance with environmental features. In order to evaluate this hypothesis, fish were collected from four different areas in the Brazilian waters in which the hake is distributed, during the summers and winters of 1996-2001 and 2004, the females being used to analyze and compare spatial-temporal variations in ovarian maturation. Gonad indexes were also applied for the same purpose. Results indicate a north-south spawning gradient occurring as from summer at around 21°S to winter near 34°S, leading to the identification of two distinct stocks: one located between 21°S and 29°S (Southeastern stock) and the other between 29°S and 34°S (Southern stock), this latter shared with Uruguay and Argentina. Brazilian stocks present clear signs of overexploitation, the situation calling for an urgent solution.<br>A merluza Merluccius hubbsi, espécie demerso-pelágica distribuída desde o Rio de Janeiro, Brasil, até a Terra do Fogo, Argentina, tornou-se alvo das frotas de arrasto de fundo da região Sudeste-Sul do Brasil desde 2001. Estudos anteriores sobre a biologia da espécie sugeriram a existência de mais de um estoque em águas brasileiras, relacionados a características ambientais. Para verificar esta hipótese, exemplares oriundos de quatro áreas em águas brasileiras foram coletados durante o verão e o inverno nos períodos 1996-2001 e 2004, sendo as fêmeas utilizadas para analisar variações espaço-temporais na maturação gonadal. Para corroborar estas análises também foram aplicados índices gonadais. Os resultados mostraram a ocorrência de um gradiente norte-sul para a desova, que é mais intenso no verão em 21°S e no inverno em 34°S. Foram identificados dois estoques: um denominado Sudeste, que se distribui entre 21°S-29°S, e outro Sul, entre 29°S-34°S, este último compartilhado com o Uruguai e a Argentina. Os estoques brasileiros apresentam sinais de sobrepesca, situação que merece atenção e medidas apropriadas de gestão. |
| first_indexed | 2024-12-13T22:22:07Z |
| format | Article |
| id | doaj.art-0c1c0771a2b54326ad61facd440143f0 |
| institution | Directory Open Access Journal |
| issn | 1679-8759 1982-436X |
| language | English |
| last_indexed | 2024-12-13T22:22:07Z |
| publishDate | 2009-03-01 |
| publisher | Universidade de São Paulo |
| record_format | Article |
| series | Brazilian Journal of Oceanography |
| spelling | doaj.art-0c1c0771a2b54326ad61facd440143f02022-12-21T23:29:19ZengUniversidade de São PauloBrazilian Journal of Oceanography1679-87591982-436X2009-03-01571173110.1590/S1679-87592009000100003Merluccius hubbsi (Teleostei: Merlucciidae): stock identification based on reproductive biology in the south-southeast brazilian regionAndré Martins Vaz-dos-SantosCarmen Lúcia Del Bianco Rossi-WongtschowskiJosé Lima de FigueiredoThe Argentine hake, Merluccius hubbsi, a demersal-pelagic species found from Rio de Janeiro, Brazil to the Tierra del Fuego, Argentina, has become an important target of the Brazilian bottom-trawler fleet since 2001. Earlier studies focusing on the species have suggested that more than one stock might occur off the Brazilian coast, in accordance with environmental features. In order to evaluate this hypothesis, fish were collected from four different areas in the Brazilian waters in which the hake is distributed, during the summers and winters of 1996-2001 and 2004, the females being used to analyze and compare spatial-temporal variations in ovarian maturation. Gonad indexes were also applied for the same purpose. Results indicate a north-south spawning gradient occurring as from summer at around 21°S to winter near 34°S, leading to the identification of two distinct stocks: one located between 21°S and 29°S (Southeastern stock) and the other between 29°S and 34°S (Southern stock), this latter shared with Uruguay and Argentina. Brazilian stocks present clear signs of overexploitation, the situation calling for an urgent solution.<br>A merluza Merluccius hubbsi, espécie demerso-pelágica distribuída desde o Rio de Janeiro, Brasil, até a Terra do Fogo, Argentina, tornou-se alvo das frotas de arrasto de fundo da região Sudeste-Sul do Brasil desde 2001. Estudos anteriores sobre a biologia da espécie sugeriram a existência de mais de um estoque em águas brasileiras, relacionados a características ambientais. Para verificar esta hipótese, exemplares oriundos de quatro áreas em águas brasileiras foram coletados durante o verão e o inverno nos períodos 1996-2001 e 2004, sendo as fêmeas utilizadas para analisar variações espaço-temporais na maturação gonadal. Para corroborar estas análises também foram aplicados índices gonadais. Os resultados mostraram a ocorrência de um gradiente norte-sul para a desova, que é mais intenso no verão em 21°S e no inverno em 34°S. Foram identificados dois estoques: um denominado Sudeste, que se distribui entre 21°S-29°S, e outro Sul, entre 29°S-34°S, este último compartilhado com o Uruguai e a Argentina. Os estoques brasileiros apresentam sinais de sobrepesca, situação que merece atenção e medidas apropriadas de gestão.http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-87592009000100003Merluccius hubbsiReproduçãoDesovaEstoquesSudeste-Sul do BrasilMerluccius hubbsiReproductionSpawningStocksSoutheast-South Brazilian Region |
| spellingShingle | André Martins Vaz-dos-Santos Carmen Lúcia Del Bianco Rossi-Wongtschowski José Lima de Figueiredo Merluccius hubbsi (Teleostei: Merlucciidae): stock identification based on reproductive biology in the south-southeast brazilian region Brazilian Journal of Oceanography Merluccius hubbsi Reprodução Desova Estoques Sudeste-Sul do Brasil Merluccius hubbsi Reproduction Spawning Stocks Southeast-South Brazilian Region |
| title | Merluccius hubbsi (Teleostei: Merlucciidae): stock identification based on reproductive biology in the south-southeast brazilian region |
| title_full | Merluccius hubbsi (Teleostei: Merlucciidae): stock identification based on reproductive biology in the south-southeast brazilian region |
| title_fullStr | Merluccius hubbsi (Teleostei: Merlucciidae): stock identification based on reproductive biology in the south-southeast brazilian region |
| title_full_unstemmed | Merluccius hubbsi (Teleostei: Merlucciidae): stock identification based on reproductive biology in the south-southeast brazilian region |
| title_short | Merluccius hubbsi (Teleostei: Merlucciidae): stock identification based on reproductive biology in the south-southeast brazilian region |
| title_sort | merluccius hubbsi teleostei merlucciidae stock identification based on reproductive biology in the south southeast brazilian region |
| topic | Merluccius hubbsi Reprodução Desova Estoques Sudeste-Sul do Brasil Merluccius hubbsi Reproduction Spawning Stocks Southeast-South Brazilian Region |
| url | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-87592009000100003 |
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