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BB19 - Mean maximum length of demersal fish and elasmobranchs (FC3)

FieldDescriptionValidated Entry
[Table title]Name of monitoring programmeMean maximum length of demersal fish and elasmobranchs (FC3)
[ProgrammeDescription]Description of the monitoring programmeThe most important data source for mean maximum length are those fisheries surveys (groundfish and beam trawl) that are conducted as part of ICES. The International Bottom Trawl Survey (IBTS) programme in the North Sea, the Celtic Seas, Bay of Biscay and Iberia is particularly important since the trawl is a general-purpose design aimed to catch both demersal and pelagic species. Standard data collected on these surveys consists of numbers of each species of fish sampled in each trawl sample, measured to defined length categories (i.e. 1cm below, so a fish with a recorded length of 14 cm would be between 14.00 cm and 14.99 cm in length). By dividing these species catch numbers-at-length by the area swept by the trawl on each sampling occasion, these catch data are converted to standardised estimates of fish density-at-length (referred to below as Catch Per Unit Area, CPUA), by species, at each sampling location.
[OtherPoliciesConventions]Monitoring for other Union legislation or international agreements that contributes to the programme.OSP-CEMP
[Contracting Parties monitoring]

Which other countries are involved in practical implementation of this monitoring programme, and what is the degree of cooperation.

Joint data collection (multinational delivery using same platform)
[Contracting Parties supplying data] DE, DK, ES, FR, IE, NL, NO, PT, SE, UK
[Contracting Parties with an "opt out"]  
[Temporal scope]Start (and end) date of the programme.1983 - 9999
[Spatial scope]Spatial coverage of the programme according to the jurisdictional zones of marine waters.EEZ (or similar, e.g. Contiguous Zone, Fishing Zone, Ecological Protection Zone)
[Aggregation of Data]At which scale can the data from the sub-programme be aggregated for environmental assessments?Regional (Greater North Sea); Subregion (Celtic Seas, Bay of Biscay)
[MarineReportingUnit]Area(s) where the programme takes place.marineSubregion

[Monitoring Purpose]

Purpose of the programme aimed at collecting data and information.Environmental state and impacts
[MonitoringType]Type of monitoring (in-situ, remote sensing, etc.).In-situ sampling offshore
In-situ sampling coastal
[Indicator Metric]Feature(s) monitored (ecosystem components, pressures, activities).FishAll
[Elements]Element(s) monitored (e.g. species, habitats, contaminants).Acipenser sturio
Amblyraja radiata
Anarhichas lupus
Anguilla anguilla
Argentina silus
Argentina sphyraena
Argentina spp.
Arnoglossus imperialis
Arnoglossus laterna
Arnoglossus rueppelli
Arnoglossus thori
Aspitrigla cuculus
Blennius ocellaris
Brosme brosme
Buglossidium luteum
Callionymus lyra
Callionymus maculatus
Centrophorus granulosus
Cepola macrophthalma
Chelidonichthys obscurus
Chimaera monstrosa
Chlorophthalmus agassizi
Citharus linguatula
Coelorinchus caelorhincus
Conger conger
Coryphaenoides rupestris
Dasyatis pastinaca
Deltentosteus quadrimaculatus
Dicentrarchus labrax
Dilodus bellotii
Dipturus batis
Dipturus oxyrinchus
Echiichthys vipera
Enchelyopus cimbrius
Etmopterus spinax
Eutrigla gurnardus
Gadiculus argenteus
Gadus morhua
Gaidropsarus macrophthalmus
Gaidropsarus vulgaris
Galeorhinus galeus
Galeus melastomus
Glossanodon leioglossus
Glyptocephalus cynoglossus
Gnathophis mystax
Helicolenus dactylopterus
Heptranchias perlo
Hippoglossus hippoglossus
Hoplostethus mediterraneus
Labrus mixtus
Lepidotrigla cavillone
Lesueurigobius friesii
Lesueurigobius sanzi
Leucoraja circularis
Leucoraja melitensis
Limanda limanda
Liparis liparis
Lophius budegassa
Lophius piscatorius
Lumpenus lampretaeformis
Macroramphosus scolopax
Melanogrammus aeglefinus
Merlangius merlangus
Merluccius merluccius
Microchirus azevia
Microchirus boscanion
Microchirus ocellatus
Microchirus variegatus
Micromesistius poutassou
Microstomus kitt
Molva dypterygia
Molva macrophthalma
Molva molva
Mullus barbatus barbatus
Mullus surmuletus
Muraena helena
Mustelus asterias
Mustelus mustelus
Myliobatis aquila
Myoxocephalus quadricornis
Myoxocephalus scorpius
Nezumia aequalis
Oxynotus centrina
Pagellus bellotii
Pagrus pagrus
Perca fluviatilis
Peristedion cataphractum
Petromyzon marinus
Phycis blennoides
Platichthys flesus
Pleuronectes platessa
Pollachius pollachius
Pollachius virens
Raja clavata
Raja montagui
Raja polystigma
Scophthalmus maximus
Scophthalmus rhombus
Scorpaena loppei
Scorpaena notata
Scyliorhinus canicula
Serranus hepatus
Spicara flexuosa
Spondyliosoma cantharus
Squalus acanthias
Squalus blainville
Squatina squatina
Symphurus nigrescens
Syngnathus typhle
Taurulus bubalis
Torpedo marmorata
Trachinus draco
Trachurus trachurus
Trigla lyra
Trisopterus luscus
Zeus faber
Zoarces viviparus
Hexanchus griseus
Myliobatis aquila
Nezumia sclerorhynchus
Hymenocephalus italicus
Boops boops
Chelidonichthys lucerna
Chelidonichthys cuculus
Chelidonichthys lastoviza
Pagellus bogaraveo
Solea solea (sin. vulgaris)
Mustelus punctulatus
Raja asterias
Lepidotrigla spp.
Trachurus picturatus
Microchirus variegatus
[Element Monitored] Species composition of the fish and elasmobranch community
[Parameter Measured]Parameter(s) monitored.BIOM
[Monitoring Guidelines/Monitoring Method in place]Guidelines/protocols describing the method for monitoring.CFP-004
[MonitoringMethodOther]Guidelines/protocols describing the method for monitoring. 
[Quality Assurance Procedures in Place]In addition to a specified method, is there any additional Quality Assurance used?ICESDataTypeGuide, National, Other
[Quality Control]What type of Quality Control is used?Real&DelayedValidation, Other QC
DATRAS has an integrated quality check utility. All data, before entering the database, have to pass an extensive quality check. Additional data scrutiny (DATRAS data downloaded on 30-03-2017) is made by OSPAR experts prior to finalisation of a dataproduct for use in indicator assessments (Moriarty and Greenstreet, 2017). The final processed dataproduct is publically available.
[Data submission Frequency (and deadline)]Frequency of the monitoring3-monthly
[Applicable MSFD GES Criteria]Indicator(s) to which the programme contributes.D4C1
[Data Depository]Link to where monitoring data can be accessed (Art. 19(3)

[Data Custodian] National data are held by ICES Data Centre
[Assessment Guidelines]
[Assessment tools available]  
[Nature of data] Product
BB19 - Mean maximum length of demersal fish and elasmobranches (FC3)