MSFD D3: possible ways of prioritizing
species assessment
Chato Osio, EC JRC
Productivity and Susceptibility analysis
151 Mediterranean Demersal and bathydemersal fish stocks
Productivity Attributes:
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Maximum age (tmax)
Maximum size (Lmax)
Growth coefficient (k)
Natural mortality (M)
Fecundity
Age-at-maturity (tmat)
Mean trophic level
Susceptibility attributes:
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Areal overlap
Vertical overlap
Morphological characteristics affecting
capture
Desirability or value of the fishery
Management strategy
Fishing mortality rate (in relation to M)
Survival after capture and release.
From Hobday et al. 2007
From Osio, Orio and Millar submitted Fish.Res
Species with estimated Mean Exploitation level
From Osio, Orio and Millar submitted Fish.Res
IUCN Classification
From Osio, Orio and Millar submitted Fish.Res
From Osio, Orio and Millar submitted Fish.Res
Species Ranking according to PSA
Vulnerability scores
Of the 151 species analysed,
• 11 species displayed low vulnerability,
•
63 medium vulnerability
• 77 high vulnerability.
Only three species of cartilaginous fishes (Raja asterias,
Mobula mobular, and Galeus melastomus) were assessed
as moderately vulnerable (1.303 ≤ V < 1.843) while the
rest as highly vulnerable (V ≥ 1.843).
- Can we assess all the highly vulnerable stocks? Are these
priority? What proportion of landings do they represent?
From Osio, Orio and Millar submitted Fish.Res
Bio-economic Species ranking
ICES recommended (iv) in case no assessments are
available to develop a priority ranking combining
productivity and susceptibility and economic/landings
values.
We tried to implement this recommendation and used the
following data:
• Vulnerability, from PSA
• Landings, from FAO-GFCM Capture Production 1970-2011.
• Economic Value, mean price per Kg for the years 20082010 based on the STECF Annual Economic Report.
Index= Vulnerability*(Landings*Econ. Value)
From Osio, Orio and Millar submitted Fish.Res
Bio-economic Species rankings
The species ranking using landings, economic value and
vulnerability returned a list of 52 species. There is a
limitation in species resolution in FAO landings.
In the top 15 ranks are 7 of the species currently assessed
(Merluccius merluccius, Mullus surmuletus, Mullus
barbatus, Pagellus erythrinus, Solea solea, Boops boops
and Micromesistius poutassou).
For the other species the ranking could give a priority list for
assessing the demersal species
To be noticed that currently in the Mediterranean stock unit
is considered to be the statistical unit (1-27) while here
we present one ranking for the entire region. In some
specific statistical areas this ranking might not reflect the
same landings proportions.
From Osio, Orio and Millar submitted Fish.Res
Scientific_name
Merluccius merluccius*
Mullus surmuletus*
Mullus barbatus*
Pagellus erythrinus*
Solea solea*
Boops boops*
Sparus aurata
Dicentrarchus labrax
Micromesistius poutassou*
Diplodus sargus
Merlangius merlangus
Lithognathus mormyrus
Zeus faber
Lepidopus caudatus
Eutrigla gurnardus
Conger conger
Psetta maxima
Anguilla anguilla
Phycis blennoides
Raja clavata*
Atherina boyeri
Lepidorhombus whiffiagonis
Sciaena umbra
Score
333750.5
204169.2
159138.2
158021.7
154640
102647.6
94507.68
73162.12
38577.51
34552.22
28659.34
28028.17
22349.29
20027.42
16535.52
16417.02
12043.71
6793.909
6583.322
6436.782
4690.361
2514.498
2419.929
Chelon labrosus
479.4086
Pagellus bogaraveo
421.1946
Scorpaena porcus
379.4591
Epinephelus aeneus
311.4721
Mustelus mustelus
253.7292
Scyliorhinus canicula
120.0129
Myliobatis aquila
102.1577
Raja asterias*
44.55649
Serranus cabrilla
36.49519
Centrophorus granulosus
35.38001
Liza saliens
27.73002
Dasyatis pastinaca
Etmopterus spinax
Alopias vulpinus
17.22696
16.4241
9.07379
Raja montagui
8.166564
Serranus scriba
6.705009
Hexanchus griseus
4.438943
Heptranchias perlo
0.551166
Stock status
compared to
MSY by
groups