A fp7 Project: Management and Monitoring of Deep-sea Fisheries and Stocks wp2 – Template for Case Study Reports Case study 2 demersal deep-water mixed fishery Pascal Lorance, Ifremer, Nantes (coord.)
Data inventory Fisheries data
Download 3.16 Mb.
|
- Navigate this page:
- Effort data
- Improvement of fishing effort data
- Landings and discards data
- Time-series of landings and discards
Data inventoryFisheries dataFleet compositionFor recent years, fleet composition data were extracted from CFR (Common fleet register). For French fleets these data are provided in the file Licensed_DWfleetFR_CFR2003-08.csv. It includes French vessels that were licensed to prosecute deep-water fishing from 2003 to 2009. Deep-water licenses where issued in application of council regulation (EC) No 2347/2002 of 16 December 2002 establishing specific access requirements and associated conditions applicable to fishing for deepseastocks. The regulation entered into force on 01/01/2003.
(1) Licenses may not be valid all years. A new vessel may enter the fleet at any time in the year and an old vessel may be decommissioned. Also, if a vessel is sent to the shipyard for a time, then it is no longer in records of active vessels during this time and its license is suspended. In 2003-206, licenses have been attributed for full year. Only from 2007, licenses may apply to part of the year only in application of the rules above. Effort dataPlease complete the tables below for each fleet ID and append all available time-series data disaggregated by fleet if possible. Please label with (1) an asterisk if data exist but are not available (but state where they exist), (2) leave blank if no data exist at all and (3) label N/K if the existence of data is not known. For demersal and pelagic trawlers:-
Please cite the minimum level at which anonymised data in each field can be provided (haul/day/trip/month/year) and detail any additional relevant information here (e.g. data source – official logbooks or skippers tallybooks or both) I'll provide anonymised data: catch per species and effort by month are statistical rectangle (1984-2008, i.e. including a long blue ling time series). This will be on the deepfishman website before the case study meeting. For more detailed levels, I'm unclear at which levels confidentiality becomes a problem. For dedicated analysis (with cefas and/or Imperial ?) detailed data are available at the resolution at which log books were filled in. Tally book data were made available to ifremer by the industry (1992-2008 with most data in 2000-2007). Option for anonymisation and availability to the project will be discussed with the industry (not commitment at the moment) For longliners:-
Please cite minimum level at which anonymised data in each field can be provided (haul/day/trip/month/year) and add any additional relevant information here (e.g. data source – official logbooks or skippers tallybooks or both). [Not relevant] For netters:-
Please cite minimum level at which anonymised data in each field can be provided (haul/day/trip/month/year) and add any additional relevant information here (e.g. data source – official logbooks or skippers tallybooks or both).
Improvement of fishing effort dataHow could the content, availability and quality of fishing effort data be improved for the fleets fishing your stock? Fishing effort data of past years can be improved from tallybooks. In EU logbooks, fishing operations (individual tows and lines and net setting) carried out in the same day and rectangle are cumulated. For the French trawling fleet, tallybooks of haul by haul data were provided by the industry and allowed for better account of all factors in LPUEs (Lorance et al. 2009). Applied to all fleets such data would allow effort to be properly handled. Electronic logbook are under development on French vessels and data will be reported haul by haul including depth. It should be noted that this improvement is particular to deep-water fisheries where depth may vary a lot in a single statistical rectangle. Therefore haul by haul data and fishing depth are much more crucial in deep water fisheries than in shelf fisheries were most of the depth information is conveyed by the statistical rectangle. VMS data also allows for improvement of effort data as is allows for some particular uses such as estimating the fishery footprint and fine scale changes in effort distribution. Nevertheless, data such as tallybooks provided to Ifremer by the industry includes all the effort information (tow duration, depth, location) coupled with catch, while using VMS requires assumptions to identify fishing and steaming activities and coupling catch to VMS data is an unresolved issue. Landings and discards dataLanded speciesThis description is based upon the he list of deep-water species from Annex I of EU regulation 2347/2002 of the council of 16 December 2002. The main species in the landings of the French fleet have been roundnose grenadier, black scabbardfish, blue ling, orange roughy, greater forkbeard, siki sharks (leafscale gulper shark and Portuguese dogfish) and black dogfish. Since the onset of the fishery, siki sharks were reported combined, only from 2002 an increasing proportion of the landing have been reported as either leafscale gulper shark or Portuguese dogfish. Black dogfish was mainly discarded in the first years of the fishery and began to be landed in the late 1990s. A number of species from Annex I of the regulation have never been landed and some other were landed as minor quantities only (Table 4.1.3.1). Minor quantities may not be reliable as a few coding errors in landings of important species may appear as small amount of another species. For example, the FAO code for leafscale gulper shark is GUQ, if it happesn to be mistyped as GUP this will appear as Gulper shark (Centrophorus granulosus). The total landings reported landings of all species quoted as "minor landings" in table 4.1.3.1. were 42 tonnes from 2003 to n2008. Table 4.1.3.1. Species from Annex I of EU regulation 2347/2002 of the council of 16 December 2002 and status in French landings.
(1) not suitable for the market owing to small size (2) Birdbeak dogfish is caught in significant quantities, but it was never marketed mainly because it cannot be skinned easily (3) not marketable on the domestic fresh fish market
Time-series of landings and discardsTimes-series of landings from the French fleet area available and will be update in due coruse during the project. Currently French landings and effort data prior to 1999 are not available in the same database as data from 1999. The loading of archive data in the current database is under way. Deep-water species ladings and effort will be updated as and when all database revison is finalised. In tables below, times series of, fleets size (number of vessels), fleet power, fishing time, fishing effort and landings are given for vessels having landed more than a certain amount of deep-water species. These estimates are available in DEEPFISHMAN data for blue ling, roundnose grenadier, black scabbardfish, deep-water sharks and all deep-water species. For every species or group, fleet number, effort and total landings of vessels having landed more than threshold levels (5, 50 100 and 500 tonnes of the species or group of species) were calculated. The 5 tonnes threshold allows to exclude vessels with small deep-water fishing activity and allows to assess the size of the fleet for which this activity is significant. Higher threshold allow to assess the size of the fleet and the effort directed to deep-water species.The list of species considered as deep-water for this analysis includess: blue ling, roundnose grenadier, black scabbardfish, orange roughy, greater forkbeard, alfonsinos, roughhead Grenadier, common mora, deepsea cardinalfish, deepsea scorpionfish, deep-water sharks and chimaeras. Table. 4.1.3.x1. French fleet of fresh fish trawlers, vessels having landed more than 5 tonnes of blue ling per year, number of vessels, total power (kw), number of days at sea and days fishing, fishing effort (fishing days* 1000 kw), landings of blue ling, landings of deep-water species (including blue ling) and all species (including deep-water).
Table. 4.1.3.x1. French fleet of fresh fish trawlers, vessels having landed more than 500 tonnes of blue ling per year, number of vessels, total power (kw), number of days at sea and days fishing, fishing effort (fishing days* 1000 kw), landings of blue ling, landings of deep-water species (including blue ling) and all species (including deep-water).
Table. 4.1.3.x2. French fleet of fresh fish trawlers, vessels having landed more than 5 tonnes of roundnose grenadier per year, number of vessels, total power (kw), number of days at sea and days fishing, fishing effort (fishing days* 1000 kw), landings of blue ling, landings of deep-water species (including blue ling) and all species (including deep-water).
Table. 4.1.3.x2. French fleet of fresh fish trawlers, vessels having landed more than 500 tonnes of roundnose grenadier per year, number of vessels, total power (kw), number of days at sea and days fishing, fishing effort (fishing days* 1000 kw), landings of blue ling, landings of deep-water species (including blue ling) and all species (including deep-water).
Table. 4.1.3.x32. French fleet of fresh fish trawlers, vessels having landed more than 5 tonnes of black scabbardfish, number of vessels, total power (kw), number of days at sea and days fishing, fishing effort (fishing days* 1000 kw), landings of blue ling, landings of deep-water species (including blue ling) and all species (including deep-water).
Table. 4.1.3.x3. French fleet of fresh fish trawlers, vessels having landed more than 100 tonnes of black scabbardfish per year, number of vessels, total power (kw), number of days at sea and days fishing, fishing effort (fishing days* 1000 kw), landings of blue ling, landings of deep-water species (including blue ling) and all species (including deep-water).
Table. 4.1.3.x32. French fleet of fresh fish trawlers, vessels having landed more than 5 tonnes of Deep-water sharks, number of vessels, total power (kw), number of days at sea and days fishing, fishing effort (fishing days* 1000 kw), landings of blue ling, landings of deep-water species (including blue ling) and all species (including deep-water).
Table. 4.1.3.x3. French fleet of fresh fish trawlers, vessels having landed more than 100 tonnes of Deep-water sharks per year, number of vessels, total power (kw), number of days at sea and days fishing, fishing effort (fishing days* 1000 kw), landings of blue ling, landings of deep-water species (including blue ling) and all species (including deep-water).
Table. 4.1.3.x1. French fleet of fresh fish trawlers, vessels having landed more than 5 tonnes of deep-water species per year, number of vessels, total power (kw), number of days at sea and days fishing, fishing effort (fishing days* 1000 kw), landings of blue ling, landings of deep-water species (including blue ling) and all species (including deep-water).
Table. 4.1.3.x1. French fleet of fresh fish trawlers, vessels having landed more than 500 tonnes of deep-water species per year, number of vessels, total power (kw), number of days at sea and days fishing, fishing effort (fishing days* 1000 kw), landings of blue ling, landings of deep-water species (including blue ling) and all species (including deep-water).
Directory: lib -> exe exe -> Homework Problem Set 3 Solution I. Reading Assignment exe -> System Modeling Assessment & Roadmap wg exe -> Artemis-2011-1 decision and platform support for model‐based eVolutionary development of Embedded systems Date of preparation exe -> Date: January December 2011 Java 5 Language psm for dds (dds-java) exe -> Notes on bcd by N. Toge (Jan. 5, 2005) Instrumentation and Control General exe -> Case Study 3 Report – Black scabbardfish in ixa exe -> 1 Beneficiaries (Partner Description) exe -> Pre-requisites exe -> Suggested (Sample) Research Project Topics (Fall 2010) Download 3.16 Mb. Share with your friends:
|