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.)
Section 1.Biological parameters with up to date description of the current knowledge of life history pattern, stock structure and status
Download 2.38 Mb.
|
- Navigate this page:
- 1.1.2.Geographical distribution of stocks
- 1.1.5.Name the Fisheries Management Organisation(s) responsible for managing the stock and supported fisheries.
- 1.1.6.Management and assessment units
- 1.1.6.2.Neighbouring management units for the same species
Section 1.Biological parameters with up to date description of the current knowledge of life history pattern, stock structure and status1.1.General information1.1.1.Name of stockDemersal deep-water mixed fishery in ICES divisions Vb and XIIb and divisions VI and VII. This fishery is prosecuted by: French deep-water trawlers in ICES division Vb and sub-areas VI and VII; Faeroese trawlers; Spanish freezer trawlers in areas VIb and XIIb…[completer Scottish, Enghish, Irish]. The fishery is referred to below as “demersal deep-water mixed fishery”. The case study name in the Deepfishman project is “Mixed demersal trawl fishery: - French trawl fishery for roundnose grenadier, black scabbardfish and deep-water sharks in Vb, VI and VII”. This is too restrictive because other deep-water fishing fleets operate in the same areas as the French fleet (although the bulk of the catch is landed by the French fleet) and for some species fleets operating on neighbouring areas are assumed to exploit the same stocks. For example the Spanish fleet fishing on the Northern and Western slope of the Hatton bank (ICES divisions VIb and XIIb) are presumed to exploit the same roundnose grenadier stock as the fleet operating further east in ICES divisions VB and VIa. Therefore, the demersal deep-water mixed fishery covers fleets fishing for roundnose grenadier, black scabbardfish and deep-water sharks in ICES divisions Vb and XIIb and sub-areas VI and VII. This fishery is primarily a trawl fishery with some fishing carried out with longlines and nets. In addition to the target species, a number of species have been caught as bycath including tusk (Brosme brosme) Chimaerids (mainly Chimaera monstrosa), black sardinal fish (Epigonus telescopus), roughead grenadier (Macrourus berglax) deepseascorpionfish (Trachiscorpia critulata echinata) have been landed in small quantities. Bycatch species are not analysed into detail in this section. 1.1.2.Geographical distribution of stocks1.1.3.Depth rangeThe main exploited stocks are roundnose grenadier (Coryphaenoides rupestris), blackscabbard fish (Aphanopus carbo), blue ling (Molva dypterygia), orange roughy (Hoplostethus atlanticus) Portuguese dogfish (Centroscymnus coelolepis), leafscale gulper shark (Centrophorus squamosus). The main by-catch commercial species are Chimearas (mainly Chimaera monstrosa, but also Hydrolagus spp.), greater forbeard (Phycis blennoides). TACs for orange roughy and and deep-water sharks (all species) were set to 0 in 2010. Table 1.1.3. depth ranges of the main deep-water exploited species in ICES sub-areas Vb, VI and VII.
1.1.4.Name the scientific organisation and Working Group responsible for carrying out stock assessments and providing scientific advice.Stock and ecosystem assessment are provided by the International Council of the Exploration of the Sea (ICES). Stock assessments are carried out by the ICES Working Group on the Biology and Assessment of Deep Sea Fisheries Resources (WGDEEP) for roundnose grenadier; black scabbardfish, greater forbeard and by ICES WGEF, Working Group on Elasmobranch Fishes, for leafscale gulper shark; Portuguese dogfish and chimaeras. Ecosystem advices provided by ICES are based upon work from the Working group on deep water ecology, WGDEC (ICES 2008a). From 2005 to 2007, ecosystem overviews included in ICES advices wer provide by the working goup for regional ecosystem description (ICES 2007d).
European Commission, in the EU Exclusive Economic Zone (EEZ) NEAFC, North East Atlantic Fisheries Organisation in international waters. Nevertheless some EU regulations apply both to EU waters and to EU vessels in International waters Faroe Islands [to be clarified] 1.1.6.Management and assessment units1.1.6.1.Management units for the demersal deep-water mixed fisheryThe current Management units were taken from the council regulation (EC) No 1359/2008 of 28 November 2008 fixing for 2009 and 2010 the fishing opportunities for Community fishing vessels for certain deep-sea fish stocks. Assessement units were taken from ICES (2009a). Table 1.1.6.1. Management units and stock assessment units of stock exploited by the demersal deep-water mixed fishery
The assessment and management units for roundnose grenadier are different. The reasons are not fully clear. Nevertheless, when TACs for deep water stocks were introduced for the first time in 2003 (council regulation (EC) No 2340/2002 of 16 December 2002 fixing for 2003 and 2007 the fishing opportunities for Community fishing vessels for certaindeep-sea fish stocks), a TAC for roundnose grenadier was defined for ICES Division Vb and sub-areas VI and VII. At that time ICES conducted assessement only for areas Vb, VI and VII and this may have driven the fixation of aTAC for this area. Nothing was done for the area XII for which data were much more limited. The ICES working group also met difficulties with separating the catch reported in sub-area XII between the western slope of the Hatton Bank and the mid-AtlanticRidge. It should be stressed that these catches were never reported be statistical rectangle to ICES, preventing a fine allocation of the catch to geographical areas. The problem in this area is one of stock identification (see section 1.2.1). The process of setting TACs for the first time is a political negociation and the project did not try to go through archives of the minutes of the discussions. A TAC in ICES areas VIII, IX, X, XII and XIV, includes areas VIII, IX and X where the species For black scabbardfish, the assessement and mangement areas match. However, the area may not correspond to a population unit (see section 1.2.1). For greater forkbeard, assessment have not been carried out in recent years because of lack of data. For this species, the stock identity is unkown (see section 1.2.1), the species is mainly caught as a by-catch. A high proportion (80%) of the total catch come from ICES sub-areas VI and VII. Information has been presented for 4 areas: ICES Subareas I, II, III, IV and V ICES Subareas VI, VII and XII (Hatton Bank) ICES Subareas VIII and I. ICES Subarea X (Azorean region) However, the ICES expert group noted that “this separation does not presuppose that there are four different stocks of Greater forkbeard and only offers a way of recording the available information.in ICES area” (ICES 2009a). Total Allowable Catch (TAC) are set for forkbeards but species the species Phycis blennoides. There is no other deep-water forkbeard species in subareas V, VI and VII. The closely related species (Phycis phycis) is distributed further south (from the Bay of Biscay, where it is rare) and is mainly a shelf demersal fish. Portuguese dogfish and leafscale gulper shark are managed together with other deep water sharks as one single unit. Management area distinguish the western slope of the european plateau from Iceland and the Faeroes down to Gibraltar on the one hand and ICES sub-area XII (Northern Mid-Atlantic ridge) on the other hand. This is appropriate as it allows to distinguish catches from long standing rather stable fisheries to the West of Europe from catch from more sporaidc fisheries in a different environnement on the mid-Atlantic ridge. This also prevent possible different trends (e.g. decreasing due to dicreasing Landings per Unit of Effort, LPUE in one area and increasing in the other due to increased fishing effort) to be merged into a not interpretable signal. 1.1.6.2.Neighbouring management units for the same speciesIn order to prevent misreporting, small TACs to allow for minor by-catch and zero TACs have been set in some areas. This applies to roundnose grenadier in EU waters of ICES sub-areas I, II, IV and Va. Moreover, the TAC for roundnose grenadier in ICES areas VIII, IX, X, XII and XIV, includes areas VIII, IX and X where the species occurs at low density only. This TACs is mainly allocated to fisheries occurring in ICES division XIIb. Then, including areas where the species in hardly caught to the area of one major fishery, which catch roughly all the TAC, prevents fisheries to develop somewhere else or catch to be misreported. Similarly, for black scabbardfish, there is a small TAC in ICES sub-areas I, II, III and IV to prevent misreporting and a TAC in ICES sub-areas VIII, IX and X, which is 99% allocated to Portugal, i.e. the Portuguese Longline fishery for black scabbardfish (see case study 3c). For greater forkbeard, there is also a small TAC in ICES sub-areas I, II, III and IV and a significant TAC (267 tonnes in 2009 and 2010) in sub-areas VIII and IX. For deep water sharks, there is no TAC in northern areas (ICES areas I-IV) but there are small TACs in ICES areas X and XII. 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 2.38 Mb. Share with your friends:
|