Italy
“2011 Discard Pilot Study” on
Set gillnets for demersal fish
Set trammel nets for demersal species
Set longlines for demersal fish
GSA18
Data Collection Framework European Commission
(Reg. CE 199/2008 and Dec. Com. 949/2008 and 93/2010)
Technical report
April 2012
1. Introduction
The results of the ranking system, performed on 2007 and 2008 data sets, have identified, at a GSA level, 55 métiers belonging to the top 90%. Derogation was requested for the collection of discards data related to the following métiers: Set gillents for demersal fish GNS_DEF_>=16_0_0 Set trammel nets for demersal species GTR_DES_>=16_0_0 Set longlines for demersal fish LLS_DEF_0_0_0 As agreed during the RCMMed&BS 2009 “for some metiers, references should be provided (in order to request a derogation) and this should be done at national level”. To follow this issue, Italy provided the requested reference. In fact according to the previous DCR (Council Regulation (EC) N° 1543/2000), a discard study covering all fishing segments (with the exclusion of the trawlers) was already carried out by Italy in 2005. The first objective of this study was to estimate discards (weight and number) of each target species listed in Appendix XII (Council Regulation (EC) N° 1543/2000 and Commission Regulation (EC) N° 1639/2001), by commercial fishing segment and Geographical Sub Areas (GSA) within one year‐period. Data on the quantities discarded of the target species were collected directly on board and the length composition by species was recorded, in order to estimate the length frequency distributions by species and fishing day. The results showed that, during the survey period (a total of 687 fishing days sampled) discards for all these activities (e.g. Trammel net, Set gillnets, Purse seine, Set longlines) can be considered negligible (Italian Technical Reports, 2005; SIBM, 2005). However, after the evaluation made by the SGRN in 2011, the requested derogation has been rejected and Italy was requested to conduct a pilot study to investigate the discards behavior of the above reported métiers (even not selected by the ranking system) updating the results of 2005 study. The object of the new study was to estimate the discard, in weight and number of the G1 and G2 species present in the Appendix VII of the Commission Decision 93/2010 and 949/2008 (see annex I) and, when possible, also of the species belonging to G3 group (Annex II). 2. Methodology 2.1 Aim of the pilot study
The objective of the pilot study was to estimate the discard, in weight and number of the species G1, G2 and G3 listed in Annex I and II, by the above mentioned métiers at GSA18 level, within one year‐period.
2.2 General characteristics of the pilot survey
The monitoring was accomplished with observers onboard when possible; otherwise a self‐sampling was performed with checks during the landing operations.
2.3 Target variable
The target variable to be recorded in the survey was the quantity (number and weight) of each target species (see Annex I and II) discarded.
Other associated variables were recorded as fishing zone, quantity landed (numbers and overall weight) of each target species.
2.4 Sampling stratification The sampling was accomplished according to a twostage stratified random sampling
(Cochran, 1977) design with strata represented by quarters and metiers. The sampling unit belonging to the métier (primary unit) was the fishing trip
(secondary unit). The number of fishing days to be sampled has been defined proportionally to the activity(numbers of days at sea for each métier) and the volume of landings.
According to the Commission Decision, the minimum number of fishing days to be sampled was at least 1 fishing day per month during the fishing season. Thus when possible according to the specific allocation of the samples in the GSA, the weather conditions, the seasonality of fisheries, and other local constraints, three samples were collected in each quarter for each métier.
The survey covered one‐year in order to detect possible seasonal difference in the abundance and composition of the discards. Also the geographical allocation of the sample along the landing sites of the GSA was taken into account in order to capture possible diverse practices at the fishing locations.
The number of fishing‐days that were sampled by métier and GSA is reported in the Annex III. 2.5 Data analysis
The averages and variances of the investigated variables (discard quantity by species and métier) and the related estimators are processed using the general formulations (Cochran, 1977) reported in the Annex IV.
3. Results In the table 1 there is the list of observations by date, harbour, fleet LOA and métier with the indication on the sampling strategy : onboard or at landing site. In table 2 the total number of observations by GSA, quarter, segment and métier is reported, whilst in table 3 the total number of specimens measured by length per quarter, segment, métier and species (the data regarding the IV quarter are under processing) are summarized. These numbers do not anticipate in any case the discard rate. Table 1 – List of the observations by GSA18, segment and metier
GSA Data Harbour Segment Metier Sampling on board (B) or at landing (L)
18 24/03/2011 Molfetta VL0006 GNS_DEF_>=16_0_0 B 18 25/03/2011 Molfetta VL0006 GNS_DEF_>=16_0_0 B 18 15/06/2011 Manfredonia VL0006 GNS_DEF_>=16_0_0 B 18 30/06/2011 Manfredonia VL0006 GNS_DEF_>=16_0_0 B 18 15/07/2011 Manfredonia VL0006 GNS_DEF_>=16_0_0 B 18 10/08/2011 Manfredonia VL0006 GNS_DEF_>=16_0_0 B 18 19/08/2011 Molfetta VL0006 GNS_DEF_>=16_0_0 B 18 09/09/2011 Manfredonia VL0006 GNS_DEF_>=16_0_0 L 18 23/09/2011 Molfetta VL0006 GNS_DEF_>=16_0_0 L 18 25/10/2011 Manfredonia VL0006 GNS_DEF_>=16_0_0 B 18 29/11/2011 Manfredonia VL0006 GNS_DEF_>=16_0_0 B 18 02/12/2011 Manfredonia VL0006 GNS_DEF_>=16_0_0 L 18 24/03/2011 Molfetta VL0612 GNS_DEF_>=16_0_0 B 18 25/03/2011 Molfetta VL0612 GNS_DEF_>=16_0_0 B 18 25/03/2011 Molfetta VL0612 GNS_DEF_>=16_0_0 L 18 03/04/2011 Manfredonia VL0612 GNS_DEF_>=16_0_0 B 18 22/04/2011 Molfetta VL0612 GNS_DEF_>=16_0_0 L 18 03/05/2011 Molfetta VL0612 GNS_DEF_>=16_0_0 L 18 24/05/2011 Molfetta VL0612 GNS_DEF_>=16_0_0 B 18 25/05/2011 Manfredonia VL0612 GNS_DEF_>=16_0_0 B 18 18/06/2011 Molfetta VL0612 GNS_DEF_>=16_0_0 B 18 21/06/2011 Manfredonia VL0612 GNS_DEF_>=16_0_0 L
18 27/06/2011 Manfredonia VL0612 GNS_DEF_>=16_0_0 B 18 19/08/2011 Molfetta VL0612 GNS_DEF_>=16_0_0 B 18 19/08/2011 Molfetta VL0612 GNS_DEF_>=16_0_0 B 18 24/08/2011 Manfredonia VL0612 GNS_DEF_>=16_0_0 L 18 22/09/2011 Molfetta VL0612 GNS_DEF_>=16_0_0 L 18 23/09/2011 Molfetta VL0612 GNS_DEF_>=16_0_0 B 18 29/09/2011 Manfredonia VL0612 GNS_DEF_>=16_0_0 B 18 18/10/2011 Molfetta VL0612 GNS_DEF_>=16_0_0 L 18 15/11/2011 Manfredonia VL0612 GNS_DEF_>=16_0_0 L 18 18/03/2011 Molfetta VL0006 GTR_DES_>=16_0_0 L 18 18/03/2011 Monopoli VL0006 GTR_DES_>=16_0_0 L 18 29/03/2011 Monopoli VL0006 GTR_DES_>=16_0_0 B 18 22/04/2011 Molfetta VL0006 GTR_DES_>=16_0_0 L 18 03/05/2011 Monopoli VL0006 GTR_DES_>=16_0_0 B 18 14/09/2011 Monopoli VL0006 GTR_DES_>=16_0_0 B 18 22/09/2011 Monopoli VL0006 GTR_DES_>=16_0_0 B 18 23/09/2011 Monopoli VL0006 GTR_DES_>=16_0_0 B 18 13/12/2011 Monopoli VL0006 GTR_DES_>=16_0_0 L 18 28/12/2011 Monopoli VL0006 GTR_DES_>=16_0_0 B 18 09/02/2011 Molfetta VL0612 GTR_DES_>=16_0_0 L 18 18/03/2011 Molfetta VL0612 GTR_DES_>=16_0_0 B 18 18/03/2011 Molfetta VL0612 GTR_DES_>=16_0_0 L 18 03/05/2011 Monopoli VL0612 GTR_DES_>=16_0_0 L 18 18/05/2011 Monopoli VL0612 GTR_DES_>=16_0_0 B 18 18/06/2011 Molfetta VL0612 GTR_DES_>=16_0_0 L 18 23/09/2011 Molfetta VL0612 GTR_DES_>=16_0_0 B 18 26/09/2011 Molfetta VL0612 GTR_DES_>=16_0_0 L 18 27/09/2011 Monopoli VL0612 GTR_DES_>=16_0_0 B 18 29/11/2011 Savelletri VL0612 GTR_DES_>=16_0_0 B 18 02/12/2011 Savelletri VL0612 GTR_DES_>=16_0_0 B 18 05/12/2011 Manfredonia VL0612 GTR_DES_>=16_0_0 L 18 28/12/2011 Savelletri VL0612 GTR_DES_>=16_0_0 L 18 19/05/2011 Monopoli VL0612 LLS_DEF_0_0_0 L 18 23/06/2011 Monopoli VL0612 LLS_DEF_0_0_0 B 18 03/09/2011 Monopoli VL0612 LLS_DEF_0_0_0 L 18 28/09/2011 Monopoli VL0612 LLS_DEF_0_0_0 B 18 18/11/2011 Monopoli VL0612 LLS_DEF_0_0_0 B 18 13/12/2011 Monopoli VL0612 LLS_DEF_0_0_0 B 18 23/12/2011 Monopoli VL0612 LLS_DEF_0_0_0 B 18 02-03/08/2011 Monopoli VL1218 LLS_DEF_0_0_0 L 18 11-12/03/2011 Monopoli VL1218 LLS_DEF_0_0_0 L 18 12-14/09/2011 Monopoli VL1218 LLS_DEF_0_0_0 L 18 16-18/04/2011 Monopoli VL1218 LLS_DEF_0_0_0 B 18 18-20/03/2011 Monopoli VL1218 LLS_DEF_0_0_0 B 18 22-23/10/2011 Monopoli VL1218 LLS_DEF_0_0_0 L 18 26-27/03/2011 Monopoli VL1218 LLS_DEF_0_0_0 B 18 29/10-1/11/2011 Monopoli VL1218 LLS_DEF_0_0_0 B
Table 2 – Total number of observations by GSA, quarter, segment and metier
GSA Quarter Segment Metier N° observation at sea
N° observation at landing
Total N° of observation
18 I VL0006 GNS_DEF_>=16_0_0 2 2 18 I VL0006 GTR_DES_>=16_0_0 1 2 3 18 I VL0612 GNS_DEF_>=16_0_0 2 1 3 18 I VL0612 GTR_DES_>=16_0_0 1 2 3 18 I VL1218 LLS_DEF_0_0_0 2 1 3 18 II VL0006 GNS_DEF_>=16_0_0 2 2 18 II VL0006 GTR_DES_>=16_0_0 1 1 2 18 II VL0612 GNS_DEF_>=16_0_0 5 3 8 18 II VL0612 GTR_DES_>=16_0_0 1 2 3 18 II VL0612 LLS_DEF_0_0_0 1 1 2 18 II VL1218 LLS_DEF_0_0_0 1 1 18 III VL0006 GNS_DEF_>=16_0_0 3 2 5 18 III VL0006 GTR_DES_>=16_0_0 3 3 18 III VL0612 GNS_DEF_>=16_0_0 4 2 6
18 III VL0612 GTR_DES_>=16_0_0 2 1 3 18 III VL0612 LLS_DEF_0_0_0 1 1 2 18 III VL1218 LLS_DEF_0_0_0 2 2 18 IV VL0006 GNS_DEF_>=16_0_0 2 1 3 18 IV VL0006 GTR_DES_>=16_0_0 1 1 2 18 IV VL0612 GNS_DEF_>=16_0_0 2 2 18 IV VL0612 GTR_DES_>=16_0_0 2 2 4 18 IV VL0612 LLS_DEF_0_0_0 3 3 18 IV VL1218 LLS_DEF_0_0_0 1 1 2
Table 3 – Total number of specimens measured by length per quarter, segment, métier
and species (the data regarding the IV quarter are under processing).
GSA Quarter Segment Metier Species codeTotal number of specimens
measured (commercial)
Total number of specimens
measured (discard)
18 I VL0006 GNS_DEF_>=16_0_0 CTC 9 18 I VL0006 GNS_DEF_>=16_0_0 HMM 171 18 I VL0612 GNS_DEF_>=16_0_0 BOG 3 18 I VL0612 GNS_DEF_>=16_0_0 CTC 30 18 I VL0612 GNS_DEF_>=16_0_0 HKE 1 18 I VL0612 GNS_DEF_>=16_0_0 HMM 97 18 I VL0612 GNS_DEF_>=16_0_0 MAS 5 18 I VL0612 GNS_DEF_>=16_0_0 PAC 4 18 I VL0006 GTR_DES_>=16_0_0 CTC 70 18 I VL0006 GTR_DES_>=16_0_0 MTS 1 18 I VL0006 GTR_DES_>=16_0_0 MUR 2 18 I VL0006 GTR_DES_>=16_0_0 OCC 3 18 I VL0006 GTR_DES_>=16_0_0 PAC 2 18 I VL0006 GTR_DES_>=16_0_0 SQR 9 18 I VL0612 GTR_DES_>=16_0_0 CTC 32 18 I VL0612 GTR_DES_>=16_0_0 HMM 1 18 I VL0612 GTR_DES_>=16_0_0 MON 1 18 I VL0612 GTR_DES_>=16_0_0 MUT 1 18 I VL0612 GTR_DES_>=16_0_0 MUR 2 18 I VL0612 GTR_DES_>=16_0_0 OCC 3 18 I VL0612 GTR_DES_>=16_0_0 PAC 2 18 I VL1218 LLS_DEF_0_0_0 DGS 4 18 I VL1218 LLS_DEF_0_0_0 HKE 152 18 I VL1218 LLS_DEF_0_0_0 HOM 131 18 I VL1218 LLS_DEF_0_0_0 HMM 3 18 I VL1218 LLS_DEF_0_0_0 MAS 28 18 I VL1218 LLS_DEF_0_0_0 MPT 2 18 I VL1218 LLS_DEF_0_0_0 PLS 10 18 I VL1218 LLS_DEF_0_0_0 RJC 14 18 I VL1218 LLS_DEF_0_0_0 SMD 6 18 II VL0006 GNS_DEF_>=16_0_0 CTC 23 18 II VL0006 GNS_DEF_>=16_0_0 HMM 2 1 18 II VL0006 GNS_DEF_>=16_0_0 MTS 105 4 18 II VL0006 GNS_DEF_>=16_0_0 OCC 1 18 II VL0006 GNS_DEF_>=16_0_0 PAC 1 18 II VL0006 GNS_DEF_>=16_0_0 PIC 7 18 II VL0612 GNS_DEF_>=16_0_0 BOG 1 4 18 II VL0612 GNS_DEF_>=16_0_0 CTC 60 18 II VL0612 GNS_DEF_>=16_0_0 GUU 6 1 18 II VL0612 GNS_DEF_>=16_0_0 HMM 149 18 II VL0612 GNS_DEF_>=16_0_0 MAC 1 18 II VL0612 GNS_DEF_>=16_0_0 MAS 10 18 II VL0612 GNS_DEF_>=16_0_0 MTS 75 7 18 II VL0612 GNS_DEF_>=16_0_0 MUT 41 18 II VL0612 GNS_DEF_>=16_0_0 OCC 5 18 II VL0612 GNS_DEF_>=16_0_0 PAC 35 2 18 II VL0612 GNS_DEF_>=16_0_0 PIC 7 18 II VL0612 GNS_DEF_>=16_0_0 SPC 1 18 II VL0612 GNS_DEF_>=16_0_0 TGS 2
18 II VL0006 GTR_DES_>=16_0_0 CTC 35 18 II VL0006 GTR_DES_>=16_0_0 MUR 2 18 II VL0006 GTR_DES_>=16_0_0 OCC 4 18 II VL0006 GTR_DES_>=16_0_0 PAC 1 1 18 II VL0006 GTR_DES_>=16_0_0 SPC 1 18 II VL0612 GTR_DES_>=16_0_0 BOG 2 18 II VL0612 GTR_DES_>=16_0_0 CTC 6 18 II VL0612 GTR_DES_>=16_0_0 GUU 1 18 II VL0612 GTR_DES_>=16_0_0 HMM 4 18 II VL0612 GTR_DES_>=16_0_0 MTS 21 18 II VL0612 GTR_DES_>=16_0_0 MUR 5 18 II VL0612 GTR_DES_>=16_0_0 MUT 1 18 II VL0612 GTR_DES_>=16_0_0 OCC 3 18 II VL0612 GTR_DES_>=16_0_0 PAC 13 18 II VL0612 GTR_DES_>=16_0_0 TGS 2 18 II VL0612 LLS_DEF_0_0_0 HMM 1 18 II VL0612 LLS_DEF_0_0_0 CTB 26 18 II VL0612 LLS_DEF_0_0_0 PAC 3 18 II VL0612 LLS_DEF_0_0_0 RPG 1 18 II VL0612 LLS_DEF_0_0_0 SBA 1 18 II VL0612 LLS_DEF_0_0_0 SWA 7 18 II VL1218 LLS_DEF_0_0_0 HKE 82 18 II VL1218 LLS_DEF_0_0_0 HOM 22 18 II VL1218 LLS_DEF_0_0_0 SHO 17 18 III VL0006 GNS_DEF_>=16_0_0 BOG 2 18 III VL0006 GNS_DEF_>=16_0_0 CTB 4 1 18 III VL0006 GNS_DEF_>=16_0_0 CTC 16 18 III VL0006 GNS_DEF_>=16_0_0 HMM 1 18 III VL0006 GNS_DEF_>=16_0_0 MTS 460 4 18 III VL0006 GNS_DEF_>=16_0_0 MUR 13 18 III VL0006 GNS_DEF_>=16_0_0 MUT 91 4 18 III VL0006 GNS_DEF_>=16_0_0 OCC 3 18 III VL0006 GNS_DEF_>=16_0_0 PAC 14 18 III VL0006 GNS_DEF_>=16_0_0 RPG 3 18 III VL0612 GNS_DEF_>=16_0_0 BOG 2 4 18 III VL0612 GNS_DEF_>=16_0_0 CTB 53 2 18 III VL0612 GNS_DEF_>=16_0_0 GUU 3 18 III VL0612 GNS_DEF_>=16_0_0 HMM 12 18 III VL0612 GNS_DEF_>=16_0_0 MTS 285 18 III VL0612 GNS_DEF_>=16_0_0 MUR 41 18 III VL0612 GNS_DEF_>=16_0_0 MUT 71 2 18 III VL0612 GNS_DEF_>=16_0_0 OCC 4 18 III VL0612 GNS_DEF_>=16_0_0 PAC 1 3 18 III VL0612 GNS_DEF_>=16_0_0 SWA 7 18 III VL0006 GTR_DES_>=16_0_0 BOG 3 18 III VL0006 GTR_DES_>=16_0_0 CTB 47 2 18 III VL0006 GTR_DES_>=16_0_0 CTC 1 18 III VL0006 GTR_DES_>=16_0_0 MUR 20 18 III VL0006 GTR_DES_>=16_0_0 MUT 2 18 III VL0006 GTR_DES_>=16_0_0 OCC 7 18 III VL0006 GTR_DES_>=16_0_0 PAC 3 6 18 III VL0006 GTR_DES_>=16_0_0 SWA 2 18 III VL0006 GTR_DES_>=16_0_0 TGS 2 18 III VL0612 GTR_DES_>=16_0_0 BOG 4 18 III VL0612 GTR_DES_>=16_0_0 CTB 66 18 III VL0612 GTR_DES_>=16_0_0 CTC 4 18 III VL0612 GTR_DES_>=16_0_0 GUU 3 18 III VL0612 GTR_DES_>=16_0_0 HMM 7 18 III VL0612 GTR_DES_>=16_0_0 MTS 7 18 III VL0612 GTR_DES_>=16_0_0 MUR 172 18 III VL0612 GTR_DES_>=16_0_0 MUT 14 18 III VL0612 GTR_DES_>=16_0_0 OCC 3 18 III VL0612 GTR_DES_>=16_0_0 PAC 2 18 III VL0612 GTR_DES_>=16_0_0 RPG 3 1 18 III VL0612 GTR_DES_>=16_0_0 SWA 19 18 II VL0612 LLS_DEF_0_0_0 BPI 22 18 II VL0612 LLS_DEF_0_0_0 PAC 15 18 II VL0612 LLS_DEF_0_0_0 CTB 6 18 II VL0612 LLS_DEF_0_0_0 RPG 6
18 II VL0612 LLS_DEF_0_0_0 SWA 21 18 II VL1218 LLS_DEF_0_0_0 GUU 10 18 II VL1218 LLS_DEF_0_0_0 HKE 70 18 II VL1218 LLS_DEF_0_0_0 HOM 15 18 II VL1218 LLS_DEF_0_0_0 MAS 20 18 II VL1218 LLS_DEF_0_0_0 PLS 6 18 II VL1218 LLS_DEF_0_0_0 QUB 39 18 II VL1218 LLS_DEF_0_0_0 RJC 4 18 II VL1218 LLS_DEF_0_0_0 RPG 4 18 II VL1218 LLS_DEF_0_0_0 SYC 3
4. Conclusion In the GSA 18 (South Adriatic) the pilot study on the discard was focused on the
following métier: Set gillents for demersal fish (GNS_DEF_>=16_0_0), Set trammel nets for demersal species (GTR_DES_>=16_0_0), Set longlines for demersal fish (LLS_DEF_0_0_0).
For the monitoring of GNS_DEF_>=16_0_0 and GTR_DES_>=16_0_0, 9 fishing boats were sampled with LOA included between 3.92 to 10.42 m. The fishing activity of this boats take place in the shallow water mostly and the usage of the two kinds of nets (GNS_DEF_>=16_0_0 and GTR_DES_>=16_0_0) is linked to the seasonality and availability of the target species (e.g. M. barbatus, M. surmuletus, S. officinalis, O. vulgaris, Sparidae etc.). For this reason the number of observations by quarter could not be regularly distributed by month. The discard for this kind of gears was rather low and manly composed of fishes damaged during the fishing operations or due to the predation by other fish. The monitored fishing harbours were spread along the coasts of the whole GSA18 (Manfredonia, Molfetta, Monopoli, Savelletri).
In our observations the gear the gear Set longlines for the demersal fish (LLS_DEF_0_0_0) is used for two kinds of fishing activity. One is more nearshore targeting Sparidae species as D. vulgaris, D. sargus, P. erythrinus etc. Another one is operated more offshore, targeting European hake (M. merluccius). The typology of the fishing boats is different according to the target: the former is operated by boats <10 m, the latter uses vessels > 12 m. In addition, the fishing trip is different: in the nearshore fishing the duration is of some hours, while for the offshore fishing the trips are from two days to 5‐6 days. Also for the LLS_DEF_0_0_0 a seasonality in the fishing activity was observed: generally from May to December the nearshore longlines are more active, while the activity of the longlines targeting European hake is more regular from March to November. Also for this gear the discard is mainly represented by damaged fish. The fishing boats equipped with long line targeting European hake are more concentrated in Monopoli fishing harbour, while the coastal longlines operate along the coast of the whole GSA18.
Despite the difficulties related to a number of factors, as: the seasonality of fishing operations, the logistic problems linked to the availability to collaborate by the fishing sector, the difficulties in getting the authorization to be onboard small boats as observer, the occurrence of the target species in the fishing operations, the objective of reaching the planned number of observations was accomplished, also as far as the sampling onboard is concerned.
5. Bibliography Cochran W.G. 1977. Sampling Techniques (3rd edition). John Wiley & Sons, N Y, USA,
428 pp. Report of the 7th Regional Coordination Meeting for the Mediterranean and Black seas
(RCMMed&BS) 2010. Varna, Bulgaria, 17 to 21 May 2010. 96pp.
Annex I: List of biological variables with species sampling specification (Y= yearly T=every three years) as reported in Appendix VII of Decision of the Commission 93/2010
Annex II: List of the biological variables belonging to Group3 (G3) as
reported at point 3.2.4. of the Report of 7th RCM held in Varna (BG) in the
2010
Following the recommendation made by the Liaison group document 2009b, the RCMMed&BS
2010 redefined a list of G3 species.
The Group recalled that this list was based on reference species of the “MEDITS” survey
(Medits Instruction manual. Versions 5) which have not been already included in Groups 1
and 2 of the DCF:
Aspitrigla cuculus, Citharus linguatula, Helicolenus dactylopterus, Lepidorhombus boscii,
Pagellus bogaraveo, Pagellus acarne, Phycis blennoides, Spicara flexuosa, Trigloporus
lastoviza, Trisopterus minutus capelanus and Zeus faber.
Thereafter a list of species of local interest has been suggested by Cyprus for GSA 25. The list
includes the following species:
Siganus sp., Pagrus pagrus, Diplodus sargus, Diplodus vulgaris, Sparisoma cretense and
Spicara maena.
This list has been completed with the suggestion made by France to add Palinurus elephas, an
important catch for some métiers around Corsica (GSA 8).
RCMMed&BS considered all the species above mentioned as part of the Mediterranean and
Black Sea Group 3 (G3) species list.
Annex III: Métier sampling strategy
Annex IV: Methodology for the estimation of discards Biological metier related variables Discard sampling survey: quantity estimation by species In the case of discard the biological métier‐related variables regard: • the evaluation of total discards by target species and métier Regarding the amount of discards, on the volume of landings, we will evaluate the discarded fraction of species commercially exploited using a ratio estimator (ratio estimator ‐ Cochran, 1977). This rate will be calculated seasonally and annually. The ratio estimator of discard (R) is calculated as:
with discard (D) and landing (L) in weight per trip j, vessel k, métier m and for species i. n= number of vessels sampled and N= total number o vessel per métier Variance will be expressed as:
f =n/N; SD= sampling variance of discards; SL= sampling variance of landing and SDL= sampling covariance On the basis of the total landings (LT) it will provides an estimate of the total deviation (TD) using the formula:
Variance can be estimated as:
with LC= landing observed; f =LC/LT and Var R= rate of discards variances.