On two new macroscopic indexes to evaluate the reproductive cycle of Ensis macha (Molina, 1782)
We describe the reproductive cycle of razor clam Ensis macha, during 1996 and 1997, in the Golfo de Arauco, Chile (37 degree 14'S-73 degree 29'W) based in the variation of the monthly averages of common and new macroscopic and microscopic indexes and scales. The common macroscopic indexes...
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Veröffentlicht in: | Journal of shellfish research 2003-12, Vol.22 (3), p.675-680 |
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description | We describe the reproductive cycle of razor clam Ensis macha, during 1996 and 1997, in the Golfo de Arauco, Chile (37 degree 14'S-73 degree 29'W) based in the variation of the monthly averages of common and new macroscopic and microscopic indexes and scales. The common macroscopic indexes are weight ratio of soft tissues to valve weight or Somatic Valve Index and, weight ratio of the soft tissues to total weight or Somatic Tissue Index. The new Macroscopic Index and scale are the quantification of the width of the posterior foot or Morphometric Index and the quantification of digestive gland cover with ovary tissue plus the degree of ovary development or mature morphometric scale. The microscopic indexes consist of the quantification of ripe gamete over the bulk of the gonadic tissues, previously treated in formalin and without stain or gametic index and the same quantification over histologic preparations or Gametic Histologic Index. The somatic valve index and somatic tissue index results are not adequate to describe the reproductive cycle of this specie; however, the Morphometric Index and Mature Morphometric Scale are very useful. These last two methods, in addition to the Gametic Index and Gametic Histologic Index, show that the razor clam reproductive cycle, over these 2 years, is characterized by a resting period from March through July, and a progressive development of the gametes between August and October. The spawn starts in November and is widespread until February. The index dropped abruptly during November 1997, showing a spawn rate more intensive than the previous year, which may be related to anomalous temperatures for the region. The reproductive E. macha cycle described here, is similar to the Ensis minor cycle in the Manfredonia Gulf, in Italy and the Ensis siliqua of Vilamoura on the southern coast of Portugal, but it is different to that observed for others authors in the Region X during 1994, and in the Golfo de Arauco and other locations of southern Chile during 1997. |
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The common macroscopic indexes are weight ratio of soft tissues to valve weight or Somatic Valve Index and, weight ratio of the soft tissues to total weight or Somatic Tissue Index. The new Macroscopic Index and scale are the quantification of the width of the posterior foot or Morphometric Index and the quantification of digestive gland cover with ovary tissue plus the degree of ovary development or mature morphometric scale. The microscopic indexes consist of the quantification of ripe gamete over the bulk of the gonadic tissues, previously treated in formalin and without stain or gametic index and the same quantification over histologic preparations or Gametic Histologic Index. The somatic valve index and somatic tissue index results are not adequate to describe the reproductive cycle of this specie; however, the Morphometric Index and Mature Morphometric Scale are very useful. These last two methods, in addition to the Gametic Index and Gametic Histologic Index, show that the razor clam reproductive cycle, over these 2 years, is characterized by a resting period from March through July, and a progressive development of the gametes between August and October. The spawn starts in November and is widespread until February. The index dropped abruptly during November 1997, showing a spawn rate more intensive than the previous year, which may be related to anomalous temperatures for the region. The reproductive E. macha cycle described here, is similar to the Ensis minor cycle in the Manfredonia Gulf, in Italy and the Ensis siliqua of Vilamoura on the southern coast of Portugal, but it is different to that observed for others authors in the Region X during 1994, and in the Golfo de Arauco and other locations of southern Chile during 1997.</description><identifier>ISSN: 0730-8000</identifier><language>eng</language><subject>Ensis macha ; Ensis minor ; Ensis siliqua ; Marine</subject><ispartof>Journal of shellfish research, 2003-12, Vol.22 (3), p.675-680</ispartof><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>314,778,782</link.rule.ids></links><search><creatorcontrib>Aracena, O L</creatorcontrib><creatorcontrib>Lepez, I M</creatorcontrib><creatorcontrib>Sanchez, J</creatorcontrib><creatorcontrib>Carmona, A M</creatorcontrib><creatorcontrib>Medina, L</creatorcontrib><creatorcontrib>Saavedra, A</creatorcontrib><title>On two new macroscopic indexes to evaluate the reproductive cycle of Ensis macha (Molina, 1782)</title><title>Journal of shellfish research</title><description>We describe the reproductive cycle of razor clam Ensis macha, during 1996 and 1997, in the Golfo de Arauco, Chile (37 degree 14'S-73 degree 29'W) based in the variation of the monthly averages of common and new macroscopic and microscopic indexes and scales. The common macroscopic indexes are weight ratio of soft tissues to valve weight or Somatic Valve Index and, weight ratio of the soft tissues to total weight or Somatic Tissue Index. The new Macroscopic Index and scale are the quantification of the width of the posterior foot or Morphometric Index and the quantification of digestive gland cover with ovary tissue plus the degree of ovary development or mature morphometric scale. The microscopic indexes consist of the quantification of ripe gamete over the bulk of the gonadic tissues, previously treated in formalin and without stain or gametic index and the same quantification over histologic preparations or Gametic Histologic Index. The somatic valve index and somatic tissue index results are not adequate to describe the reproductive cycle of this specie; however, the Morphometric Index and Mature Morphometric Scale are very useful. These last two methods, in addition to the Gametic Index and Gametic Histologic Index, show that the razor clam reproductive cycle, over these 2 years, is characterized by a resting period from March through July, and a progressive development of the gametes between August and October. The spawn starts in November and is widespread until February. The index dropped abruptly during November 1997, showing a spawn rate more intensive than the previous year, which may be related to anomalous temperatures for the region. The reproductive E. macha cycle described here, is similar to the Ensis minor cycle in the Manfredonia Gulf, in Italy and the Ensis siliqua of Vilamoura on the southern coast of Portugal, but it is different to that observed for others authors in the Region X during 1994, and in the Golfo de Arauco and other locations of southern Chile during 1997.</description><subject>Ensis macha</subject><subject>Ensis minor</subject><subject>Ensis siliqua</subject><subject>Marine</subject><issn>0730-8000</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2003</creationdate><recordtype>article</recordtype><recordid>eNotjstOwzAQAH0AiVL4hz0hkIi0dhI_jqgqD6moFzhHG3ejGqVxqJ0W_p4iOM1pRnMmZmhKLCwiXojLlD4QlXOmmolmPUA-Rhj4CDvy-5h8HIOHMGz4ixPkCHygfqLMkLcMex73cTP5HA4M_tv3DLGD5ZBC-vW3BLevsQ8D3YM0Vt1difOO-sTX_5yL98fl2-K5WK2fXhYPq2KUtspFWSnNRltvqNOtU5LQsTVIpNpK1pqxJcWsK0M1SaldWbadsrZF7TokWc7FzV_3tPc5ccrNLiTPfU8Dxyk1p5m6qtGVP7keT3k</recordid><startdate>20031201</startdate><enddate>20031201</enddate><creator>Aracena, O L</creator><creator>Lepez, I M</creator><creator>Sanchez, J</creator><creator>Carmona, A M</creator><creator>Medina, L</creator><creator>Saavedra, A</creator><scope>7TN</scope><scope>F1W</scope><scope>H95</scope><scope>L.G</scope></search><sort><creationdate>20031201</creationdate><title>On two new macroscopic indexes to evaluate the reproductive cycle of Ensis macha (Molina, 1782)</title><author>Aracena, O L ; Lepez, I M ; Sanchez, J ; Carmona, A M ; Medina, L ; Saavedra, A</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-p184t-3426e768c7af6b921a09e870aa2b4156e0ba2ee647a5a116933bf288b069f0a13</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2003</creationdate><topic>Ensis macha</topic><topic>Ensis minor</topic><topic>Ensis siliqua</topic><topic>Marine</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Aracena, O L</creatorcontrib><creatorcontrib>Lepez, I M</creatorcontrib><creatorcontrib>Sanchez, J</creatorcontrib><creatorcontrib>Carmona, A M</creatorcontrib><creatorcontrib>Medina, L</creatorcontrib><creatorcontrib>Saavedra, A</creatorcontrib><collection>Oceanic Abstracts</collection><collection>ASFA: Aquatic Sciences and Fisheries Abstracts</collection><collection>Aquatic Science & Fisheries Abstracts (ASFA) 1: Biological Sciences & Living Resources</collection><collection>Aquatic Science & Fisheries Abstracts (ASFA) Professional</collection><jtitle>Journal of shellfish research</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Aracena, O L</au><au>Lepez, I M</au><au>Sanchez, J</au><au>Carmona, A M</au><au>Medina, L</au><au>Saavedra, A</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>On two new macroscopic indexes to evaluate the reproductive cycle of Ensis macha (Molina, 1782)</atitle><jtitle>Journal of shellfish research</jtitle><date>2003-12-01</date><risdate>2003</risdate><volume>22</volume><issue>3</issue><spage>675</spage><epage>680</epage><pages>675-680</pages><issn>0730-8000</issn><abstract>We describe the reproductive cycle of razor clam Ensis macha, during 1996 and 1997, in the Golfo de Arauco, Chile (37 degree 14'S-73 degree 29'W) based in the variation of the monthly averages of common and new macroscopic and microscopic indexes and scales. The common macroscopic indexes are weight ratio of soft tissues to valve weight or Somatic Valve Index and, weight ratio of the soft tissues to total weight or Somatic Tissue Index. The new Macroscopic Index and scale are the quantification of the width of the posterior foot or Morphometric Index and the quantification of digestive gland cover with ovary tissue plus the degree of ovary development or mature morphometric scale. The microscopic indexes consist of the quantification of ripe gamete over the bulk of the gonadic tissues, previously treated in formalin and without stain or gametic index and the same quantification over histologic preparations or Gametic Histologic Index. The somatic valve index and somatic tissue index results are not adequate to describe the reproductive cycle of this specie; however, the Morphometric Index and Mature Morphometric Scale are very useful. These last two methods, in addition to the Gametic Index and Gametic Histologic Index, show that the razor clam reproductive cycle, over these 2 years, is characterized by a resting period from March through July, and a progressive development of the gametes between August and October. The spawn starts in November and is widespread until February. The index dropped abruptly during November 1997, showing a spawn rate more intensive than the previous year, which may be related to anomalous temperatures for the region. The reproductive E. macha cycle described here, is similar to the Ensis minor cycle in the Manfredonia Gulf, in Italy and the Ensis siliqua of Vilamoura on the southern coast of Portugal, but it is different to that observed for others authors in the Region X during 1994, and in the Golfo de Arauco and other locations of southern Chile during 1997.</abstract><tpages>6</tpages></addata></record> |
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subjects | Ensis macha Ensis minor Ensis siliqua Marine |
title | On two new macroscopic indexes to evaluate the reproductive cycle of Ensis macha (Molina, 1782) |
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