{"refrec":{"BRefID":117514,"RR":"<b>Hauton, C.; Howell, T.R.W.; Atkinson, R.J.A.; Moore, P.G.</b> (2007). Measures of hydraulic dredge efficiency and razor clam production, two aspects governing sustainability within the Scottish commercial fishery. <i>J. Mar. Biol. Ass. U.K. 87(4)</i>: 869-877. <a href=\"https://dx.doi.org/10.1017/S0025315407055300\" target=\"_blank\">https://dx.doi.org/10.1017/S0025315407055300</a>","BEntID":111831,"PublicFlag":1,"CheckedFlag":1,"wosflag":1,"vabbflag":1,"RefStringPartII":". <i>J. Mar. Biol. Ass. U.K. 87(4)</i>: 869-877. <a href=\"https://dx.doi.org/10.1017/S0025315407055300\" target=\"_blank\">https://dx.doi.org/10.1017/S0025315407055300</a>","DocTypID":8,"DocType":"Journal article","MarineFlag":1,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Hauton, C.; Howell, T.R.W.; Atkinson, R.J.A.; Moore, P.G.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Hauton, C. <i>et al.</i>","Englishabstract":"A study was made of the efficiency of a commercially available hydraulic dredge design in use on the west coast of Scotland and of the annual biomass production of two different razor clam (<i>Ensis</i> spp.) beds within the Clyde Sea area. These two parameters, viz fishing efficiency and population annual production, are fundamentally important to any proper attempt to assess the long term sustainability of a fishery. The hydraulic dredge used in this study was found to have an absolute efficiency of 90.1% when expressed in terms of the collected wet weight biomass, representing the first time that the efficiency of a hydraulic dredge of this nature has been measured rather than simply inferred from track width. This indicates that this dredge design has the potential to remove the majority of a clam population, including undersized immature individuals, within a 45 cm swath in a single tow. Annual production estimates were also made for two separate razor clam beds. One population of <i>Ensis siliqua</i> was located in Irvine Bay and the other two populations (one <i>E. siliqua</i> and one <i>E. arcuatus</i>) occurred in a mixed bed on Hunterston Sands. Each location was sampled quantitatively on a regular basis using the same hydraulic dredge. Dredged areas were measured by SCUBA divers so that the population densities could be calculated for each sampling event. Size-classes within each population were identified from siphonal shell breadth measurements and production estimates were calculated using a size-cohort analysis procedure designed for stocks exhibiting recruitment but that do not have separable age-classes. Production of all three populations was low during the study (1.82-18.08 g AFDW 10 m<sup>-2</sup>) as were the production/biomass estimates (0.01-0.11). These data indicate that populations of <i>Ensis</i> spp. on the west coast of Scotland are slow-growing and typical of K-selected species. These data highlight the conflicting pressures facing any razor clam fishery: the design of extremely efficient hydraulic gear and the slow-growth of the target species. It is clear that the future commercial exploitation of these species will need very careful management to ensure sustainability and avoid fishery over-depletion.","AbstractOtherLang":null,"BibLvlCode":"AS","StandardTitle":"Measures of hydraulic dredge efficiency and razor clam production, two aspects governing sustainability within the Scottish commercial fishery","OrigTitleLangCode":"en","OrigTitleLangCodeExtended":"eng","OrigTitleLangID":15,"DateLastModified":{"date":"2026-06-05 01:30:50.485243","timezone_type":1,"timezone":"+02:00"},"UserAccessRight":null,"UserAccID":null,"AuthorKeywords":null,"OtherDescriptors":null,"Notes":null,"AnaPub":2007,"MonPub":null,"DateUpdate":"2020-10-26","DateCreate":"2007-12-04","SecASFANote":null,"ConfID":null,"PeerRev":1,"VlizCoreFlag":1,"WoScode":"WOS:000249347900006","VABBcode":null,"OpenAcc":0,"DOI":"10.1017/S0025315407055300"},"refs":null,"anarec":{"AnaID":117514,"PubliDate":2007,"Pagination":"869-877","XtraPublOfAnaID":null,"ISBN":null,"Volume":"87","Issue":"4","BRefMon":null,"BRefMonRR":null,"BRefXtra":null,"BRefXtraRR":null,"SerBRefID":43277,"SerRR":"Journal of the Marine Biological Association of the United Kingdom. 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