{"refrec":{"BRefID":244120,"RR":"<b>Shephard, S.; Reid, D.G.; Gerritsen, H.D.; Farnsworth, K.D.</b> (2015). Estimating biomass, fishing mortality, and \"total allowable discards\" for surveyed non-target fish. <i>ICES J. Mar. Sci./J. Cons. int. Explor. Mer 72(2)</i>: 458-466. <a href=\"http://dx.doi.org/10.1093/icesjms/fsu146\" target=\"_blank\">http://dx.doi.org/10.1093/icesjms/fsu146</a>","BEntID":235823,"PublicFlag":1,"CheckedFlag":1,"wosflag":1,"vabbflag":null,"RefStringPartII":". <i>ICES J. Mar. Sci./J. Cons. int. Explor. Mer 72(2)</i>: 458-466. <a href=\"http://dx.doi.org/10.1093/icesjms/fsu146\" target=\"_blank\">http://dx.doi.org/10.1093/icesjms/fsu146</a>","DocTypID":8,"DocType":"Journal article","MarineFlag":1,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Shephard, S.; Reid, D.G.; Gerritsen, H.D.; Farnsworth, K.D.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Shephard, S. <i>et al.</i>","Englishabstract":"Demersal fisheries targeting a few high-value species often catch and discard other “non-target” species. It is difficult to quantify the impact of this incidental mortality when population biomass of a non-target species is unknown. We calculate biomass for 14 demersal fish species in ICES Area VIIg (Celtic Sea) by applying species- and length-based catchability corrections to catch records from the Irish Groundfish Survey (IGFS). We then combine these biomass estimates with records of commercial discards (and landings for marketable non-target species) to calculate annual harvesting rates (<em>HR</em>) for each study species. Uncertainty is incorporated into estimates of both biomass and <em>HR</em>. Our survey-based <em>HR</em> estimates for cod and whiting compared well with <em>HR</em>-converted fishing mortality (<em>F</em>) estimates from analytical assessments for these two stocks. Of the non-target species tested, red gurnard (<em>Chelidonichthys cuculus</em>) recorded some annual <em>HR</em>s greater than those for cod or whiting; challenging “Pope's postulate” that <em>F</em> on non-target stocks in an assemblage will not exceed that on target stocks. We relate <em>HR</em> for each species to two corresponding maximum sustainable yield (MSY) reference levels; six non-target species (including three ray species) show annual <em>HR</em>s = <em>HR</em><sub>MSY</sub>. This result suggests that it may not be possible to conserve vulnerable non-target species when <em>F</em> is coupled to that of target species. Based on biomass, <em>HR</em>, and <em>HR</em><sub>MSY</sub>, we estimate “total allowable catch” for each non-target species.","AbstractOtherLang":null,"BibLvlCode":"AS","StandardTitle":"Estimating biomass, fishing mortality, and \"total allowable discards\" for surveyed non-target fish","OrigTitleLangCode":"en","OrigTitleLangCodeExtended":"eng","OrigTitleLangID":15,"DateLastModified":{"date":"2026-06-06 01:33:00.873741","timezone_type":1,"timezone":"+02:00"},"UserAccessRight":null,"UserAccID":null,"AuthorKeywords":"Data-poor stocks; Elasmobranchs; Pope's postulate  ","OtherDescriptors":null,"Notes":null,"AnaPub":2015,"MonPub":null,"DateUpdate":"2018-02-13","DateCreate":"2015-01-21","SecASFANote":null,"ConfID":null,"PeerRev":1,"VlizCoreFlag":1,"WoScode":"WOS:000350154300014","VABBcode":null,"OpenAcc":1,"DOI":"10.1093/icesjms/fsu146"},"refs":null,"anarec":{"AnaID":244120,"PubliDate":2015,"Pagination":"458-466","XtraPublOfAnaID":null,"ISBN":null,"Volume":"72","Issue":"2","BRefMon":null,"BRefMonRR":null,"BRefXtra":null,"BRefXtraRR":null,"SerBRefID":44710,"SerRR":"ICES Journal of Marine Science. Academic Press: London.  ISSN 1054-3139; e-ISSN 1095-9289","StandardTitleSer":"ICES Journal of Marine Science","ISSN":"1054-3139","AbbrevSer":"ICES J. Mar. Sci./J. Cons. int. Explor. Mer","StandardTitleMon":null,"StartPage":458,"Pages":9,"ToPubliDate":null,"BRefBibLvlCode":"S","SerNotes":null},"monrec":null,"serrec":null,"relations":null,"relationsRev":null,"addrec":null,"othpubs":null,"ownerships":null,"authors":[{"AutName":"Shephard","Firstname":"Samuel","Initials":"S.","Affiliation":"Queens Univ Belfast, Sch Biol Sci, Belfast BT9 7BL, Antrim, North Ireland.","Discriminator":null,"CorporateFlag":0,"BEntID":235823,"AutID":297503,"OrderNr":1,"DegrID":null,"EditorFlag":0,"CorrespFlag":0,"IllustratorFlag":0,"ReviserFlag":0,"TranslatorFlag":0,"InsAcronym":null,"InsFSN":null,"ORCID":null,"PersID":null,"InsID":null},{"AutName":"Reid","Firstname":"David","Initials":"D.G.","Affiliation":"Inst Marine, Oranmore, Galway, Ireland.","Discriminator":"David","CorporateFlag":0,"BEntID":235823,"AutID":297504,"OrderNr":2,"DegrID":null,"EditorFlag":0,"CorrespFlag":0,"IllustratorFlag":0,"ReviserFlag":0,"TranslatorFlag":0,"InsAcronym":null,"InsFSN":null,"ORCID":null,"PersID":null,"InsID":null},{"AutName":"Gerritsen","Firstname":"Hans","Initials":"H.D.","Affiliation":"Inst Marine, Oranmore, Galway, Ireland.","Discriminator":null,"CorporateFlag":0,"BEntID":235823,"AutID":297505,"OrderNr":3,"DegrID":null,"EditorFlag":0,"CorrespFlag":0,"IllustratorFlag":0,"ReviserFlag":0,"TranslatorFlag":0,"InsAcronym":null,"InsFSN":null,"ORCID":null,"PersID":null,"InsID":null},{"AutName":"Farnsworth","Firstname":"Keith","Initials":"K.D.","Affiliation":"Queens Univ Belfast, Sch Biol Sci, Belfast BT9 7BL, Antrim, North Ireland.","Discriminator":null,"CorporateFlag":0,"BEntID":235823,"AutID":297506,"OrderNr":4,"DegrID":null,"EditorFlag":0,"CorrespFlag":0,"IllustratorFlag":0,"ReviserFlag":0,"TranslatorFlag":0,"InsAcronym":null,"InsFSN":null,"ORCID":null,"PersID":null,"InsID":null}],"mapdetails":null,"datasets":null,"monographs":null,"monparts":null,"serparts":null,"BEntOpen":null,"BEntPrivate":null,"availability":[{"BInstID":267774,"LibID":36,"BRefID":244120,"EmbargoDate":null,"FullEmbargoDate":null,"PhysMedID":16,"hasOCRd":1,"ShelfLocCode":"267774","RFID":null,"PaidValue":null,"Medium":"Server","Description":"VLIZ Open Access","Acronym":"VLIZ","Library":"Vlaams Instituut voor de Zee","DutchTerm":"Open access","URL":null,"ClassifID":53,"Classification":"Open access","ReqLink":null,"ClassifTypID":1,"URLLocation":"https://www.vliz.be/imisdocs/publications/","SubDir":null,"InternalReq":0,"LoggedInReq":0,"Disclaimer":null,"DutchDisclaimer":null,"FileFormat":".pdf","FileDescr":"pdf","InsPub":1,"InsID":36,"FileFormID":6,"LendableFlag":1,"PublicFlag":1,"orderLib":"A","Notes":null,"AccConID":null,"AccessConstraint":null,"LicURL":null}],"litstyles":null,"thespers":null,"arch2discl":null,"SERpubls":[{"PublName":"Academic Press","City":"London"}],"MONpubls":null,"pictures":[],"thestermsPath":[{"ThesaurusTerm":"By catch","ThestID":1243,"Acronym":"ASFA","ThesTermPath":"By catch"},{"ThesaurusTerm":"Catchability","ThestID":1396,"Acronym":"ASFA","ThesTermPath":"Catchability"},{"ThesaurusTerm":"Stock assessment","ThestID":8023,"Acronym":"ASFA","ThesTermPath":"Stock assessment"}],"thestermsASFA":[{"ThesaurusTerm":"By catch"},{"ThesaurusTerm":"Catchability"},{"ThesaurusTerm":"Stock assessment"}],"taxtermsASFA":[{"TaxTerm":"Elasmobranchii"}],"geotermsASFA":null,"collections":null,"conf":null,"proj":null,"Physdatasets":null,"spcols":null,"doi":null,"publs":null,"serparttypes":null,"monauthors":null,"MParts":null,"SParts":null,"hLibs":null,"langs":[{"BEntID":235823,"AbstractFlag":0,"LangID":15,"LangCode":"en","Lang":"English","DutchTerm":"Engels","LangCodeExtended":"eng"}],"urls":[{"URL":"http://dx.doi.org/10.1093/icesjms/fsu146","externalID":"10.1093/icesjms/fsu146","URLTypeCode":"DOI","URLID":37104,"URLTypID":13,"URLType":"DOI","URLPrefix":"http://dx.doi.org/"}],"thesterms":[{"ThesaurusTerm":"By catch","ThestID":1243,"Acronym":"ASFA","ThesTypID":1,"ThesType":"ASFA Thesaurus List"},{"ThesaurusTerm":"Catchability","ThestID":1396,"Acronym":"ASFA","ThesTypID":1,"ThesType":"ASFA Thesaurus List"},{"ThesaurusTerm":"Stock assessment","ThestID":8023,"Acronym":"ASFA","ThesTypID":1,"ThesType":"ASFA Thesaurus List"}],"taxterms":[{"TaxTerm":"Elasmobranchii","AphiaID":10193,"TaxtID":20609}],"geoterms":null,"othterms":null,"asfacodes":null,"asfa2codes":null,"thestermsFRIS":[{"ThesaurusTerm":"By catch","DutchTerm":"Bijvangst","ThestID":1243,"Acronym":"ASFA","ThesTypID":1,"ThesType":"ASFA Thesaurus List"},{"ThesaurusTerm":"Catchability","DutchTerm":null,"ThestID":1396,"Acronym":"ASFA","ThesTypID":1,"ThesType":"ASFA Thesaurus List"},{"ThesaurusTerm":"Stock assessment","DutchTerm":"Evaluatie van stocks","ThestID":8023,"Acronym":"ASFA","ThesTypID":1,"ThesType":"ASFA Thesaurus List"}],"taxtermsFRIS":[{"TaxTerm":"Elasmobranchii","DutchTerm":"Kraakbeenvissen","AphiaID":10193,"TaxtID":20609}],"geotermsFRIS":null,"othtermsFRIS":null,"resmessage":"","complete":1,"sessions":{"newSesName":"Chisala, Chilekwa, C.","newSesDate":{"date":"2015-01-21 09:40:57.683000","timezone_type":3,"timezone":"Europe/Brussels"},"updSesName":"Lyssens, Liesbeth, L.","updSesDate":{"date":"2018-02-13 19:34:46.407000","timezone_type":3,"timezone":"Europe/Brussels"}}}