{"id":8003,"date":"2018-07-12T09:14:10","date_gmt":"2018-07-12T07:14:10","guid":{"rendered":"http:\/\/cienciagandia.webs.upv.es\/?p=8003"},"modified":"2018-07-12T10:37:37","modified_gmt":"2018-07-12T08:37:37","slug":"noves-relacions-biometriques-permeten-una-millor-estimacio-del-pes-de-la-tonyina-roja","status":"publish","type":"post","link":"https:\/\/cienciagandia.webs.upv.es\/ca\/2018\/07\/noves-relacions-biometriques-permeten-una-millor-estimacio-del-pes-de-la-tonyina-roja\/","title":{"rendered":"Noves relacions biom\u00e8triques permeten una millor estimaci\u00f3 del pes de la tonyina roja"},"content":{"rendered":"<p>Investigadors de la <a href=\"http:\/\/www.upv.es\/\">Universitat Polit\u00e8cnica de Val\u00e8ncia<\/a> i l&#8217;<a href=\"http:\/\/www.ieo.es\/\">Institut Espanyol d&#8217;Oceanografia<\/a> han presentat un estudi en el qual es determina el pes de la<strong> tonyina roja<\/strong> a partir de la seua longitud, altura i ampl\u00e0ria m\u00e0xima. L&#8217;aplicaci\u00f3 d&#8217;aquest estudi en el sector contribuiria a la <strong>millora dels controls per a la a la recuperaci\u00f3 d&#8217;aquesta esp\u00e8cie<\/strong>, molt valorada a tot el m\u00f3n, especialment en pa\u00efsos com <strong>Jap\u00f3<\/strong>.<!--more--><\/p>\n<p>\u201cLa seua aplicaci\u00f3 directa en les plantes de greixatge de tonyina roja permetria un major control del proc\u00e9s per part dels productors i faria <strong>m\u00e9s eficient i ecol\u00f2gicament sostenible<\/strong> el greixatge de la tonyina roja en captivitat\u201d, apunta <strong><a href=\"http:\/\/www.upv.es\/pls\/oalu\/sic_person.Info?p_alias=vipuipon&amp;P_IDIOMA=v\">Vicente Puig<\/a><\/strong>, investigador de l&#8217;<a href=\"http:\/\/igic.webs.upv.es\/\">Institut per a la Gesti\u00f3 Integrada de Zones Costaneres<\/a> del <a href=\"http:\/\/www.upv.es\/contenidos\/CGANDIA\/index-va.html\">Campus de Gandia de la UPV<\/a>. Aquest treball ha sigut publicat en la revista <a href=\"http:\/\/journals.plos.org\/plosone\/article?id=10.1371\/journal.pone.0200406\">PLOS ONE<\/a>.<\/p>\n<figure id=\"attachment_7996\" aria-describedby=\"caption-attachment-7996\" style=\"width: 630px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-7996 size-full\" src=\"https:\/\/cienciagandia.webs.upv.es\/wp-content\/uploads\/2018\/07\/atun-rojo-campus-gandia-upv-medicion-control-vicente-puig.png\" alt=\"\" width=\"640\" height=\"360\" srcset=\"https:\/\/cienciagandia.webs.upv.es\/wp-content\/uploads\/2018\/07\/atun-rojo-campus-gandia-upv-medicion-control-vicente-puig.png 640w, https:\/\/cienciagandia.webs.upv.es\/wp-content\/uploads\/2018\/07\/atun-rojo-campus-gandia-upv-medicion-control-vicente-puig-444x250.png 444w, https:\/\/cienciagandia.webs.upv.es\/wp-content\/uploads\/2018\/07\/atun-rojo-campus-gandia-upv-medicion-control-vicente-puig-150x84.png 150w\" sizes=\"auto, (max-width: 640px) 100vw, 640px\" \/><figcaption id=\"caption-attachment-7996\" class=\"wp-caption-text\">Vicente Puig<\/figcaption><\/figure>\n<p>Actualment, les tonyines s\u00f3n capturades en alta mar i introdu\u00efts en g\u00e0bies de transport, que s\u00f3n remolcades fins a zones costaneres en les quals estan instal\u00b7lades les g\u00e0bies d&#8217;engreixament. All\u00ed es realitza la transfer\u00e8ncia de tonyines d&#8217;unes g\u00e0bies a unes altres. Durant les transfer\u00e8ncies un operari amb un programari b\u00e0sic i de manera manual mesura la longitud d&#8217;almenys el 20 % de les tonyines transferides. El pes mitj\u00e0 de les tonyines transferides es determina fent \u00fas de<strong> relacions biom\u00e8triques<\/strong> que solament tenen en compte la longitud mitjana dels peixos i el nombre exacte dels peixos capturats, la qual cosa pot provocar<strong> mesures err\u00f2nies<\/strong>, produint-se sobreestimacions o subestimacions en moltes ocasions.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-7998\" src=\"https:\/\/cienciagandia.webs.upv.es\/wp-content\/uploads\/2018\/07\/medida-de-un-atun.jpg\" alt=\"\" width=\"640\" height=\"429\" srcset=\"https:\/\/cienciagandia.webs.upv.es\/wp-content\/uploads\/2018\/07\/medida-de-un-atun.jpg 689w, https:\/\/cienciagandia.webs.upv.es\/wp-content\/uploads\/2018\/07\/medida-de-un-atun-373x250.jpg 373w, https:\/\/cienciagandia.webs.upv.es\/wp-content\/uploads\/2018\/07\/medida-de-un-atun-150x101.jpg 150w\" sizes=\"auto, (max-width: 640px) 100vw, 640px\" \/><\/p>\n<p>\u201cEl que es fa actualment \u00e9s <strong>mesurar la longitud d&#8217;un 20% de les tonyines capturades<\/strong> i fer una<strong> estimaci\u00f3 de la captura total<\/strong>. Si es capturen 1000 tonyines, es mesuren 200 i es trau la mitjana de longitud i pes. \u00d2bviament, <strong>no tots els exemplars s\u00f3n iguals<\/strong>; un pot mesurar X i el seu pes ser diferent a un altre exemplar de la mateixa longitud.\u00a0 Per tant, es tracta d&#8217;una estimaci\u00f3 que <strong>pot diferir bastant de la captura real<\/strong>. Les relacions oposades en el nostre estudi ajudaran a <strong>minimitzar aquests errors<\/strong>\u201d, explica Vicente Puig, investigador de l&#8217;Institut per a la Gesti\u00f3 Integrada de Zones Costaneres del campus de Gandia de la UPV.<\/p>\n<p>L&#8217;estudi presentat ara per aquests investigadors s&#8217;emmarca dins del projecte Acustuna i complementa <a href=\"https:\/\/cienciagandia.webs.upv.es\/ca\/2017\/05\/nou-sistema-de-comptatge-per-a-calcular-el-nombre-i-biomassa-de-les-tonyines-roges\/\">el que ja van desenvolupar l&#8217;any passat, dins del <strong>projecte Biacop<\/strong><\/a><strong>,<\/strong> que combinava t\u00e8cniques de mesurament ac\u00fastic i de visi\u00f3 estereosc\u00f2pica per al comptatge.<\/p>\n<p>En l&#8217;estudi es presenten una s\u00e8rie d&#8217;equacions, desenvolupades pels investigadors de la UPV a partir de mesures reals despr\u00e9s de l&#8217;extracci\u00f3 d&#8217;exemplars engreixats en g\u00e0bies. Aplicant aquestes equacions, l&#8217;estimaci\u00f3 de les captures i el control del greixatge per part dels productors \u00e9s <strong>molt m\u00e9s prec\u00eds<\/strong>.<\/p>\n<p><iframe loading=\"lazy\" src=\"https:\/\/www.youtube.com\/embed\/8S8t12ceJzw\" width=\"560\" height=\"315\" frameborder=\"0\" allowfullscreen=\"allowfullscreen\"><\/iframe><\/p>\n<p>\u201cAmb el sistema desenvolupat en Biacop, a m\u00e9s de la longitud, podem mesurar tamb\u00e9 <strong>l&#8217;ampl\u00e0ria de les tonyines<\/strong>. Les relacions biom\u00e8triques presentades en aquest treball permetran estimar a m\u00e9s el pes de la tonyina d&#8217;una manera m\u00e9s exacta. Amb ajuda d&#8217;equacions predictives del pes a partir de les dimensions lineals de la tonyina, <strong>els marges d&#8217;error en l&#8217;estimaci\u00f3 de la biomassa capturada es redueixen significativament.<\/strong> El nostre objectiu \u00e9s oferir un sistema que contribu\u00efsca a la conservaci\u00f3 de l&#8217;esp\u00e8cie, coneixent millor l&#8217;estat de les pesqueres; que els pescadors puguen pescar, es conega millor el que es pesca, i que les restriccions imposades per a impedir la sobreexplotaci\u00f3 dels recursos tinguen com a fruit la sostenibilitat de l&#8217;esp\u00e8cie\u201d, explica Vicente Puig.<\/p>\n<hr \/>\n<p style=\"text-align: center;\"><strong><a href=\"http:\/\/www.upv.es\/pls\/oalu\/sic_person.Info?p_alias=luizucon&amp;P_IDIOMA=c\">Luis Zurano<\/a><\/strong><\/p>\n<p style=\"text-align: center;\"><a href=\"http:\/\/ciencia.blogs.upv.es\/\">Unitat de comunicaci\u00f3 cient\u00edfica UPV<\/a><\/p>\n<p><em>Foto portada:\u00a0Laika ac<\/em><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Investigadors de la Universitat Polit\u00e8cnica de Val\u00e8ncia i l&#8217;Institut Espanyol d&#8217;Oceanografia han presentat un estudi en el qual es determina el pes de la tonyina &#8230; <a title=\"Noves relacions biom\u00e8triques permeten una millor estimaci\u00f3 del pes de la tonyina roja\" class=\"read-more\" href=\"https:\/\/cienciagandia.webs.upv.es\/ca\/2018\/07\/noves-relacions-biometriques-permeten-una-millor-estimacio-del-pes-de-la-tonyina-roja\/\" aria-label=\"Read more about Noves relacions biom\u00e8triques permeten una millor estimaci\u00f3 del pes de la tonyina roja\">Llegir m\u00e9s<\/a><\/p>\n","protected":false},"author":15,"featured_media":8017,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[252],"tags":[706],"class_list":["post-8003","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-tecnologia","tag-destacat-ca","resize-featured-image"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Noves relacions biom\u00e8triques permeten una millor estimaci\u00f3 del pes de la tonyina roja - Campus de Gandia Ciencia - UPV Universitat Polit\u00e8cnica de Val\u00e8ncia<\/title>\n<meta name=\"description\" content=\"L&#039;estudi de la UPV i l&#039;Institut Espanyol d&#039;Oceanografia contribuir\u00e0 a millorar els controls per a la recuperaci\u00f3 de la tonyina roja\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, 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