Special issue on Discards regulation vs Mediterranean fisheries sustainability.-- 10 pages, 5 fig... more Special issue on Discards regulation vs Mediterranean fisheries sustainability.-- 10 pages, 5 figures, 5 tables, supplementary material http://scimar.icm.csic.es/scimar/supplm/sm04784esm.pdf[EN] There is currently very little information on the survival to discarding of unwanted and non-regulated catches of invertebrates, after the stresses due to capture. A great number of the non-regulated invertebrate species are the basis of Essential Fish Habitats for important fisheries resources such as hake, red mullet or cuttlefish. Thus, data on their survival to discarding may help to interpret the role of these species within the benthic ecosystems. Furthermore, descriptor 6 of Marine Strategy Framework Directive (MSFD, EU Directive 2008/56/E) foresees maintaining sea floor integrity at a level that ensures that the structure and functions of the ecosystems are safeguarded and article 7(d) of the Common Fishery Policy (CFP, EU Reg. 1380/2013) foresees the implementation of management mea...
Trawling pressure and environmental changes may affect the composition of fish assemblages. Our k... more Trawling pressure and environmental changes may affect the composition of fish assemblages. Our knowledge on large spatio-temporal patterns of demersal fish composition remains incomplete for the Mediterranean Sea. We investigated (1) the spatio-temporal stability of demersal assemblages, (2) the relationships between these assemblages and potential structuring factors (trawling pressure and environmental conditions) in order to assess the dynamic of the assemblage structure at the scale of the northern Mediterranean Sea. We analysed a dataset of 18062 hauls from 10 to 800 m depth performed annually during the last two decades across 17 Geographical Sub-Areas (GSAs) (MEDITS program). A multi-table analysis (STATICO-CoA) evidenced a strong inter-GSAs stability in the organization of assemblages, with specificities for some GSAs. The most stable structuring factors were linked to combined gradients of chlorophyll a, phytoplancton carbon biomass and temperature, inversely correlated wi...
The main characteristics concerning the distribution of two of the most important decapod crustac... more The main characteristics concerning the distribution of two of the most important decapod crustaceans of commercial interest in the Mediterranean Sea, the deep-water rose shrimp, Parapenaeus longirostris, and the Norway lobster, Nephrops norvegicus, are studied in the European Mediterranean waters. The study is based on data collected under the MEDITS trawl surveys from 1994 to 2015 from the Gibraltar Straits to the northeastern Levantine Basin (Cyprus waters). The observed differences can be interpreted as different responses to environmental drivers related to the differing life history traits of the two species. In fact, N. norvegicus is a long-living, benthic burrowing species with low growth and mortality rates, while P. longirostris is an epibenthic, short-living species characterized by higher rates of growth and mortality.
Journal of Northwest Atlantic Fishery Science, 2003
The composition of the catch of the deep-sea trawl fleet of Porto Santo Stefano (northern Tyrrhen... more The composition of the catch of the deep-sea trawl fleet of Porto Santo Stefano (northern Tyrrhenian Sea, western Mediterranean) was analysed. In the period 1995-1999 observations were carried out on board of commercial vessels, collecting data for about 500 trawling hours. Nephrops norvegicus, Parapenaeus longirostris and large specimens of Merluccius merluccius were the targets on the fishing grounds from 300 to 450 m, while Aristaemorpha foliacea, Aristeus antennatus and N. norvegicus on the fishing grounds from 450 to 650 m depth. By-catch dominated the biomass caught, and was characterised by a high degree of species richness, a s a consequence of the reduced selectivity of the bottom trawl gear. An important fraction of the by-catch was constituted by commercially retained species, which provided an important added value to the landings. Catch of target species was entirely comme rcialised. Annual average discards were about 20% of the total catch. Discard of commercial species was mostly due to species under commercial size, while discard of non-commercial species was represented by a large number of small size species of fishes and crustaceans. The results seem to indicate that this kind of fishery achieves a fairly good compromise between efficiency of resource utilisation and impact on the demersal communities.
... Auteur(s) / Author(s). DE RANIERI S. ; SBRANA M. ; Affiliation(s) du ou des auteurs / Author(... more ... Auteur(s) / Author(s). DE RANIERI S. ; SBRANA M. ; Affiliation(s) du ou des auteurs / Author(s) Affiliation(s). Univ. Pisa, dip. sci. ... Pisces. ; Vertebrata. ; Localisation / Location. INIST-CNRS, Cote INIST : 18325, 35400003025435.0130. Nº notice refdoc (ud4) : 5514905. ...
Temporal and spatial variation in Merluccius merluccius recruitment in the Northwest Mediterranea... more Temporal and spatial variation in Merluccius merluccius recruitment in the Northwest Mediterranean is examined, and recruitment indices are derived from monthly M. merluccius catch rates of four bottom-trawl fleets operating in Spanish and Italian waters during the period 1991–1999. Where M. merluccius catches were not recorded by size category, multivariate techniques were applied to species proportions in order to identify catch records most representative of recruit abundance. Selected catch rates were analysed by generalized linear models (GLMs) to estimate recruitment indices. The GLMs explain large proportions of the variation in recruit abundance (50–84%) and indicate significant annual and seasonal variation in recruitment strength. Vessel was by far the most important factor affecting catch rates of recruits, stressing the need to account for vessel characteristics when analysing commercial catch data for stock assessment. Seasonal patterns of recruitment reveal similaritie...
The selectivity of a traditional trammel net, a mono®lament trammel net and a gill net for Lithog... more The selectivity of a traditional trammel net, a mono®lament trammel net and a gill net for Lithognathus mormyrus (striped seabream), Diplodus annularis (annular sea-bream) and Mullus barbatus (red mullet) was investigated in two coastal areas (central Adriatic sea and southern Ligurian sea). Three mesh sizes were tested for each set net: 45, 70 and 90 mm (stretched-mesh size). Selectivity was assessed by the indirect Sechin model based on the measurement of maximum body girth and head girth. The 45-mm mesh size was the most ef®cient for all the target species irrespective of net type. The catches obtained with the 90-mm meshes were always very low as were the catches of D. annularis and M. barbatus with the 70-mm mesh. Although most ®shes of the three target species were caught by gilling and/or wedging, with all gears a number of individuals were also caught by virtue of the tangled and/or pocket effects. Their proportion, lowest and generally negligible in the gill net, higher in the mono®lament and highest in the standard trammel net, caused a progressive widening of size-catch ranges, con®rming the low selectivity of trammel nets. The 45-mm mesh appears to be the most suitable for the exploitation of the target species because it caught the highest number of specimens while it largely spared the juveniles.
Abstract: The deep water rose shrimp, Parapenaeus longirostris, is a very important commercial sp... more Abstract: The deep water rose shrimp, Parapenaeus longirostris, is a very important commercial species for trawl fleets that fish in the Mediterranean as well as in the Gulf of Cadiz and to the south of Portugal. Despite its importance, its life cycle has not been ...
In the Mediterranean, experiments and technical measures aimed at improving the selectivity of bo... more In the Mediterranean, experiments and technical measures aimed at improving the selectivity of bottom trawl nets mostly concern modifications to the codend. Grids have been tested in various areas, but have not been adopted for management purposes so far. The present study aims to evaluate whether the adoption of diamond meshes turned by 90° (T90 configuration) and a selection grid with 2 cm bar spacing, both placed in the extension piece of a commercial bottom trawl net, can contribute in reducing the capture of specimens under the Minimum Conservation Reference Size (MCRS) for the main commercial species. The results indicated that the T90 configuration has no effect compared to the commercial net commonly used by fishers. The grid showed a reduction of the catches of European hake individuals between 11 and 19 cm Total Length (TL). However, the use of this device reduced the catch of many species, such as red mullet, deep-water rose shrimp and broad tail short fin squid. This red...
The presence of plastic waste in the marine environment has driven the scientific community to ma... more The presence of plastic waste in the marine environment has driven the scientific community to make significant efforts to study and mitigate its possible effects. One of the critical aspects is to determine if and how an increase in ingestion events may occur as a result of the accumulation of plastic waste on the seabed. In this study, G. melastomus is examined for its ability to indirectly provide information on the amount of macroplastics accumulating on the seafloor. Plastic ingestion is explored by describing the feeding habits of the species, which have the potential to provide very useful information regarding biological or ecological issues. The diet of G. melastomus mainly consisted of cephalopods, bathypelagic fishes, and decapod crustaceans, increasing in diversity during growth. The generalist-opportunistic feeding behaviour of this species leads to the incidental ingestion of plastic particles (N= 47, with a mean (± SD) of 1.47 ± 0.28 per specimen) which can be indirec...
Long term trends in the variation of reproduction parameters can be indicative of a change in the... more Long term trends in the variation of reproduction parameters can be indicative of a change in the life-history traits of the species and could have consequences for survival (i.e. natural mortality) and condition, and ultimately affect recruitment success and population growth and persistence. In this deliverable we analysed potential historical changes in reproduction parameters calculated for the reproduction period, gonadosomatic index (GSI) and size at first maturity (L50) of European sardine and anchovy from GSA06 (Northern Spain) and GSA01 (Alboran Sea). In the case of European sardine, GSA06 data was divided in two subareas, GSA6 north (data from Tarragona harbour) and GSA06 south (data from Torrevieja harbour). Results are compared with previous historical analysis on GSA07 (Gulf of Lions, Brosset et al., 2016) and with the information gathered from the review performed under SPELMED and presented in deliverable D1.3.2.2. [...]
By evaluating genetic variation across the entire genome, one can address existing questions in a... more By evaluating genetic variation across the entire genome, one can address existing questions in a novel way while new can be asked. Such questions include how different local environments influence both adaptive and neutral genomic variation within and among populations, providing insights not only into local adaptation of natural populations, but also into their responses to global change and the exploitation-induced evolution. Here, under a seascape genomic approach, ddRAD genomic data were used along with environmental information to uncover the underlying processes (migration, selection) shaping European sardines (Sardina pilchardus) of the Western Mediterranean and adjacent Atlantic waters. This information can be relevant to the (re)definition of fishery stocks, and their short-term adaptive potential. We found that studied sardine samples form two clusters, detected using both neutral and adaptive (outlier) loci suggesting that natural selection and local adaptation play a ke...
Small-scale fisheries represent one of the most important fishing sectors in Italy, comprising 60... more Small-scale fisheries represent one of the most important fishing sectors in Italy, comprising 60% of Italian fishing vessels, half the fishers and 16% of national landings. Despite their high social, economic and cultural value, they have been neglected by national and international policies, resulting in a poor outlook for the near future. In this chapter, we provide an overview of recent trends, the status of small-scale fisheries in Italy and major, current threats to the sector. These include: competition from large-scale fisheries, rivalry with illegal, unreported and unregulated fishing, recreational fisheries, ecological changes and the degradation of ecosystems. The evolution of international and national legislation affecting small-scale fisheries is also outlined, with examples of opportunities and challenges in two complementary case studies from the Tyrrhenian and Ionian Seas. The analysis is mainly focused on participatory, bottom-up management tools (local management ...
Special issue on Discards regulation vs Mediterranean fisheries sustainability.-- 10 pages, 5 fig... more Special issue on Discards regulation vs Mediterranean fisheries sustainability.-- 10 pages, 5 figures, 5 tables, supplementary material http://scimar.icm.csic.es/scimar/supplm/sm04784esm.pdf[EN] There is currently very little information on the survival to discarding of unwanted and non-regulated catches of invertebrates, after the stresses due to capture. A great number of the non-regulated invertebrate species are the basis of Essential Fish Habitats for important fisheries resources such as hake, red mullet or cuttlefish. Thus, data on their survival to discarding may help to interpret the role of these species within the benthic ecosystems. Furthermore, descriptor 6 of Marine Strategy Framework Directive (MSFD, EU Directive 2008/56/E) foresees maintaining sea floor integrity at a level that ensures that the structure and functions of the ecosystems are safeguarded and article 7(d) of the Common Fishery Policy (CFP, EU Reg. 1380/2013) foresees the implementation of management mea...
Trawling pressure and environmental changes may affect the composition of fish assemblages. Our k... more Trawling pressure and environmental changes may affect the composition of fish assemblages. Our knowledge on large spatio-temporal patterns of demersal fish composition remains incomplete for the Mediterranean Sea. We investigated (1) the spatio-temporal stability of demersal assemblages, (2) the relationships between these assemblages and potential structuring factors (trawling pressure and environmental conditions) in order to assess the dynamic of the assemblage structure at the scale of the northern Mediterranean Sea. We analysed a dataset of 18062 hauls from 10 to 800 m depth performed annually during the last two decades across 17 Geographical Sub-Areas (GSAs) (MEDITS program). A multi-table analysis (STATICO-CoA) evidenced a strong inter-GSAs stability in the organization of assemblages, with specificities for some GSAs. The most stable structuring factors were linked to combined gradients of chlorophyll a, phytoplancton carbon biomass and temperature, inversely correlated wi...
The main characteristics concerning the distribution of two of the most important decapod crustac... more The main characteristics concerning the distribution of two of the most important decapod crustaceans of commercial interest in the Mediterranean Sea, the deep-water rose shrimp, Parapenaeus longirostris, and the Norway lobster, Nephrops norvegicus, are studied in the European Mediterranean waters. The study is based on data collected under the MEDITS trawl surveys from 1994 to 2015 from the Gibraltar Straits to the northeastern Levantine Basin (Cyprus waters). The observed differences can be interpreted as different responses to environmental drivers related to the differing life history traits of the two species. In fact, N. norvegicus is a long-living, benthic burrowing species with low growth and mortality rates, while P. longirostris is an epibenthic, short-living species characterized by higher rates of growth and mortality.
Journal of Northwest Atlantic Fishery Science, 2003
The composition of the catch of the deep-sea trawl fleet of Porto Santo Stefano (northern Tyrrhen... more The composition of the catch of the deep-sea trawl fleet of Porto Santo Stefano (northern Tyrrhenian Sea, western Mediterranean) was analysed. In the period 1995-1999 observations were carried out on board of commercial vessels, collecting data for about 500 trawling hours. Nephrops norvegicus, Parapenaeus longirostris and large specimens of Merluccius merluccius were the targets on the fishing grounds from 300 to 450 m, while Aristaemorpha foliacea, Aristeus antennatus and N. norvegicus on the fishing grounds from 450 to 650 m depth. By-catch dominated the biomass caught, and was characterised by a high degree of species richness, a s a consequence of the reduced selectivity of the bottom trawl gear. An important fraction of the by-catch was constituted by commercially retained species, which provided an important added value to the landings. Catch of target species was entirely comme rcialised. Annual average discards were about 20% of the total catch. Discard of commercial species was mostly due to species under commercial size, while discard of non-commercial species was represented by a large number of small size species of fishes and crustaceans. The results seem to indicate that this kind of fishery achieves a fairly good compromise between efficiency of resource utilisation and impact on the demersal communities.
... Auteur(s) / Author(s). DE RANIERI S. ; SBRANA M. ; Affiliation(s) du ou des auteurs / Author(... more ... Auteur(s) / Author(s). DE RANIERI S. ; SBRANA M. ; Affiliation(s) du ou des auteurs / Author(s) Affiliation(s). Univ. Pisa, dip. sci. ... Pisces. ; Vertebrata. ; Localisation / Location. INIST-CNRS, Cote INIST : 18325, 35400003025435.0130. Nº notice refdoc (ud4) : 5514905. ...
Temporal and spatial variation in Merluccius merluccius recruitment in the Northwest Mediterranea... more Temporal and spatial variation in Merluccius merluccius recruitment in the Northwest Mediterranean is examined, and recruitment indices are derived from monthly M. merluccius catch rates of four bottom-trawl fleets operating in Spanish and Italian waters during the period 1991–1999. Where M. merluccius catches were not recorded by size category, multivariate techniques were applied to species proportions in order to identify catch records most representative of recruit abundance. Selected catch rates were analysed by generalized linear models (GLMs) to estimate recruitment indices. The GLMs explain large proportions of the variation in recruit abundance (50–84%) and indicate significant annual and seasonal variation in recruitment strength. Vessel was by far the most important factor affecting catch rates of recruits, stressing the need to account for vessel characteristics when analysing commercial catch data for stock assessment. Seasonal patterns of recruitment reveal similaritie...
The selectivity of a traditional trammel net, a mono®lament trammel net and a gill net for Lithog... more The selectivity of a traditional trammel net, a mono®lament trammel net and a gill net for Lithognathus mormyrus (striped seabream), Diplodus annularis (annular sea-bream) and Mullus barbatus (red mullet) was investigated in two coastal areas (central Adriatic sea and southern Ligurian sea). Three mesh sizes were tested for each set net: 45, 70 and 90 mm (stretched-mesh size). Selectivity was assessed by the indirect Sechin model based on the measurement of maximum body girth and head girth. The 45-mm mesh size was the most ef®cient for all the target species irrespective of net type. The catches obtained with the 90-mm meshes were always very low as were the catches of D. annularis and M. barbatus with the 70-mm mesh. Although most ®shes of the three target species were caught by gilling and/or wedging, with all gears a number of individuals were also caught by virtue of the tangled and/or pocket effects. Their proportion, lowest and generally negligible in the gill net, higher in the mono®lament and highest in the standard trammel net, caused a progressive widening of size-catch ranges, con®rming the low selectivity of trammel nets. The 45-mm mesh appears to be the most suitable for the exploitation of the target species because it caught the highest number of specimens while it largely spared the juveniles.
Abstract: The deep water rose shrimp, Parapenaeus longirostris, is a very important commercial sp... more Abstract: The deep water rose shrimp, Parapenaeus longirostris, is a very important commercial species for trawl fleets that fish in the Mediterranean as well as in the Gulf of Cadiz and to the south of Portugal. Despite its importance, its life cycle has not been ...
In the Mediterranean, experiments and technical measures aimed at improving the selectivity of bo... more In the Mediterranean, experiments and technical measures aimed at improving the selectivity of bottom trawl nets mostly concern modifications to the codend. Grids have been tested in various areas, but have not been adopted for management purposes so far. The present study aims to evaluate whether the adoption of diamond meshes turned by 90° (T90 configuration) and a selection grid with 2 cm bar spacing, both placed in the extension piece of a commercial bottom trawl net, can contribute in reducing the capture of specimens under the Minimum Conservation Reference Size (MCRS) for the main commercial species. The results indicated that the T90 configuration has no effect compared to the commercial net commonly used by fishers. The grid showed a reduction of the catches of European hake individuals between 11 and 19 cm Total Length (TL). However, the use of this device reduced the catch of many species, such as red mullet, deep-water rose shrimp and broad tail short fin squid. This red...
The presence of plastic waste in the marine environment has driven the scientific community to ma... more The presence of plastic waste in the marine environment has driven the scientific community to make significant efforts to study and mitigate its possible effects. One of the critical aspects is to determine if and how an increase in ingestion events may occur as a result of the accumulation of plastic waste on the seabed. In this study, G. melastomus is examined for its ability to indirectly provide information on the amount of macroplastics accumulating on the seafloor. Plastic ingestion is explored by describing the feeding habits of the species, which have the potential to provide very useful information regarding biological or ecological issues. The diet of G. melastomus mainly consisted of cephalopods, bathypelagic fishes, and decapod crustaceans, increasing in diversity during growth. The generalist-opportunistic feeding behaviour of this species leads to the incidental ingestion of plastic particles (N= 47, with a mean (± SD) of 1.47 ± 0.28 per specimen) which can be indirec...
Long term trends in the variation of reproduction parameters can be indicative of a change in the... more Long term trends in the variation of reproduction parameters can be indicative of a change in the life-history traits of the species and could have consequences for survival (i.e. natural mortality) and condition, and ultimately affect recruitment success and population growth and persistence. In this deliverable we analysed potential historical changes in reproduction parameters calculated for the reproduction period, gonadosomatic index (GSI) and size at first maturity (L50) of European sardine and anchovy from GSA06 (Northern Spain) and GSA01 (Alboran Sea). In the case of European sardine, GSA06 data was divided in two subareas, GSA6 north (data from Tarragona harbour) and GSA06 south (data from Torrevieja harbour). Results are compared with previous historical analysis on GSA07 (Gulf of Lions, Brosset et al., 2016) and with the information gathered from the review performed under SPELMED and presented in deliverable D1.3.2.2. [...]
By evaluating genetic variation across the entire genome, one can address existing questions in a... more By evaluating genetic variation across the entire genome, one can address existing questions in a novel way while new can be asked. Such questions include how different local environments influence both adaptive and neutral genomic variation within and among populations, providing insights not only into local adaptation of natural populations, but also into their responses to global change and the exploitation-induced evolution. Here, under a seascape genomic approach, ddRAD genomic data were used along with environmental information to uncover the underlying processes (migration, selection) shaping European sardines (Sardina pilchardus) of the Western Mediterranean and adjacent Atlantic waters. This information can be relevant to the (re)definition of fishery stocks, and their short-term adaptive potential. We found that studied sardine samples form two clusters, detected using both neutral and adaptive (outlier) loci suggesting that natural selection and local adaptation play a ke...
Small-scale fisheries represent one of the most important fishing sectors in Italy, comprising 60... more Small-scale fisheries represent one of the most important fishing sectors in Italy, comprising 60% of Italian fishing vessels, half the fishers and 16% of national landings. Despite their high social, economic and cultural value, they have been neglected by national and international policies, resulting in a poor outlook for the near future. In this chapter, we provide an overview of recent trends, the status of small-scale fisheries in Italy and major, current threats to the sector. These include: competition from large-scale fisheries, rivalry with illegal, unreported and unregulated fishing, recreational fisheries, ecological changes and the degradation of ecosystems. The evolution of international and national legislation affecting small-scale fisheries is also outlined, with examples of opportunities and challenges in two complementary case studies from the Tyrrhenian and Ionian Seas. The analysis is mainly focused on participatory, bottom-up management tools (local management ...
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