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Papers by Pierre-Yves Dremière
Science et Pêche, Dec 1, 1978
Depuis 1970, année record de la production sardinière en Méditerranée (plus de 22000 t dont 21 00... more Depuis 1970, année record de la production sardinière en Méditerranée (plus de 22000 t dont 21 000 t en provenance des quartiers de Port-Vendres, Sète, Martigues et Marseille), la pêche de la sardine s'est trouvée confrontée à de nombreuses difficultés. Avec une production proche de 11000 t seulement, la campagne sardinière 1976 s'est inscrite dans la ligne d'un certain déclin de la pêche de ce petit pélagique qui, se manifestant depuis six ans, a ramené le niveau de production à celui des années 1960-1965, période de début du développement et d'organisation de cette activité.-Devant cette situation préoccupante, les pêcheurs professionnels de Méditerranée, et notamment ceux des quartiers maritimes de Sète et de Port-Vendres, avaient émis le souhait, dès 1975, de pratiquer le chalutage pélagique, technique jusqu'alors interdite par arrêté du 30 novembre 1970. L'une des principales raisons avancées par les pêcheurs pour justifier cette démarche, était que l'emploi du chalut pélagique devait permettre d'étaler la production sardinière au cours de l'année et, par conséquent, d'améliorer la commercialisation, dans la mesure où les conserveurs, non satisfaits par des approvisionnements ponctuels importants en juin-juillet et septembre-octobre dans les quartiers de Port-Vendres et de Sète, et d'octobre à janvier dans le quartier de Marseille, trouveraient ainsi une solution à leurs problèmes. Plus de 50 % des apports sont en effet débarqués dans ces 3 quartiers pendant les périodes précitées, lesquelles ne représentent que 4 mois de l'année pour chacun d'eux. A la suite de la parution d'un nouvel arrêté en date du 3 mai 1977, réglementant l'emploi du chalut pélagique sur le plan national, 2 réunions furent tenues les 29 et 31 mars à Port-Vendres et à Sète, à l'initiative de la Direction des Affaires Maritimes en Méditerranée et à laquelle participaient toutes les catégories de pêcheurs (chalutiers, senneurs, petits métiers). Ces réunions permirent d'envisager pour 1977 une campagne expérimentale destinée d'une part à examiner les possibilités de production en fonction de l'utilisation de cet engin de pêche, nouveau pour la Méditerranée française, et d'autre part à maîtriser les conditions de commercialisation des produits débarqués. 1. Conditions de déroulement de la campagne. Les principales conditions qui ont été définies lors des réunions tenues à Port-Vendres et à Sète les 29 et 31 mars 1977 peuvent se résumer de la manière suivante. a) Le nombre des navires autorisés à pratiquer le chalutage pélagique «en boeuf», procédé choisi de préférence au chalutage pélagique à un seul bateau, est limité à 10 couples pour le quartier de Port-Vendres, 6 couples pour celui de Sète.
... contribué à l'élaboration de cet ouvrage, en particulier Nicole Lacroix, Patricia Ba... more ... contribué à l'élaboration de cet ouvrage, en particulier Nicole Lacroix, Patricia Barthélémy, Isabelle Peronnet, ManeJiennette Dubuit, Loic Antoine, Pierre Duval ... Ces panneaux sont soit fixés direc-tement sur les ailes du chalut (chaluts à cre-vettes), soit reliés à ces dernières par ...
Materials and accessories Fishing gear and operations Equipment for deck and wheelhouse Fishing v... more Materials and accessories Fishing gear and operations Equipment for deck and wheelhouse Fishing vessel operations Formulae and tables Ordering equipment Index.
Scientia Marina, 2002
An international bottom trawl survey (the MEDITS programme) has been carried out every year in th... more An international bottom trawl survey (the MEDITS programme) has been carried out every year in the Mediterranean since 1994. During each survey, about 1000 hauls are done by a fleet of 8 to 11 vessels from 10 to 800 m depth, applying a unique standardized sampling protocol. This study analyses the trajectory and the performances of the sampling gear used for this survey, from records obtained during the surveys aboard some vessels in different geographical sub-areas and at different depth levels. Two kinds of sensors have been used, one to characterize a posteriori the vertical trajectory of the trawl from the beginning of shooting to the end of hauling (830 hauls), the other to describe in real time the stabilization of the trawl at its beginning (16 hauls) and its geometry during the tow (840 hauls). The results show the variability extent of these parameters linked with vessel, area, depth and period, illustrating their impact on the swept area estimates used for biological asses...
Aquatic Living …, 1999
The aim of the work presented in this paper was to assess the relative efficiency of the GOC 73 s... more The aim of the work presented in this paper was to assess the relative efficiency of the GOC 73 sampling trawl used for the Mediterranean international trawl survey programme (MEDITS) compared with that of a typical Italian commercial trawl. The latter was chosen because it is ...
Aquatic Living Resources, 1999
Escapement through the body or under the footrope of the sampling trawl used for the Mediterranea... more Escapement through the body or under the footrope of the sampling trawl used for the Mediterranean international trawl survey programme (MEDITS) was assessed i) by means of visual observations performed with a towed operating vehicle equipped with a high-sensitivity video camera, and ii) by attaching small bags to the outside of the trawl body and under the footrope. Due to the small size of most of the individuals present in the study area and to the towing speed, fish behaviour in front of the trawl could not be frequently observed. In contrast, their behaviour was easily observed inside the net, especially upstream and inside the codend. Sorne species, such as horse mackerel (Trachurus sp.), showed greater swimming endurance compared with others such as annular seabream (Diplodus annularis). In three fishing trips conducted in different seasons in 1996 and 1997 to obtain data on several species in different areas of the Adriatic, six small net bags were mounted outside the body of the MEDITS trawl to quantify escapement through the trawl belly and under the footrope. Significant escapement of many species occurred in the near-bottom part of the side panels. Norway lobster (Nephrops norvegicus) had the highest rate (64 %), mainly represented by small-size individuals. The escapement of greater forkbeard (Phycis blennoides) was also high (53 %). For hake (Merluccius merluccius), common pandora (Pagellus erythrinus) and poor cod (Trisopterus minutus capelanus), rates ranged from 10 to 16 %. The escapement of red mullet (Mullus barbatus) was very low despite their great abundance. Blue whiting (Micromesistius poutassou) escaped mainly through the mid-height part of the side panel. This great variability of escapement values could affect the proportion rates of the species sampled during a standard survey. Different escape behaviours among size classes were observed for M. poutassou, T. minutus capelan us and P. erythrinus, with smaller individuals tending to escape towards the bottom and larger ones towards the higher parts of the trawl body. In the species where the escape rate was size-dependent, therefore, the size-frequency distributions obtained from the codend catch may not reflect actual size-frequency distributions. © Ifremer/CnrslInra/lrdlCemagreflElsevier, Paris Survey trawl selectivity 1 trawl escapement 1 bottom trawls 1 experimental fishing 1 underwater observations 1 Mediterranean
Aquatic Living Resources, 1999
Escapement through the body or under the footrope of the sampling trawl used for the Mediterranea... more Escapement through the body or under the footrope of the sampling trawl used for the Mediterranean international trawl survey programme (MEDITS) was assessed i) by means of visual observations performed with a towed operating vehicle equipped with a high-sensitivity video camera, and ii) by attaching small bags to the outside of the trawl body and under the footrope. Due to the small size of most of the individuals present in the study area and to the towing speed, fish behaviour in front of the trawl could not be frequently observed. In contrast, their behaviour was easily observed inside the net, especially upstream and inside the codend. Sorne species, such as horse mackerel (Trachurus sp.), showed greater swimming endurance compared with others such as annular seabream (Diplodus annularis). In three fishing trips conducted in different seasons in 1996 and 1997 to obtain data on several species in different areas of the Adriatic, six small net bags were mounted outside the body of the MEDITS trawl to quantify escapement through the trawl belly and under the footrope. Significant escapement of many species occurred in the near-bottom part of the side panels. Norway lobster (Nephrops norvegicus) had the highest rate (64 %), mainly represented by small-size individuals. The escapement of greater forkbeard (Phycis blennoides) was also high (53 %). For hake (Merluccius merluccius), common pandora (Pagellus erythrinus) and poor cod (Trisopterus minutus capelanus), rates ranged from 10 to 16 %. The escapement of red mullet (Mullus barbatus) was very low despite their great abundance. Blue whiting (Micromesistius poutassou) escaped mainly through the mid-height part of the side panel. This great variability of escapement values could affect the proportion rates of the species sampled during a standard survey. Different escape behaviours among size classes were observed for M. poutassou, T. minutus capelan us and P. erythrinus, with smaller individuals tending to escape towards the bottom and larger ones towards the higher parts of the trawl body. In the species where the escape rate was size-dependent, therefore, the size-frequency distributions obtained from the codend catch may not reflect actual size-frequency distributions. © Ifremer/CnrslInra/lrdlCemagreflElsevier, Paris Survey trawl selectivity 1 trawl escapement 1 bottom trawls 1 experimental fishing 1 underwater observations 1 Mediterranean
Science et Pêche, Dec 1, 1978
Depuis 1970, année record de la production sardinière en Méditerranée (plus de 22000 t dont 21 00... more Depuis 1970, année record de la production sardinière en Méditerranée (plus de 22000 t dont 21 000 t en provenance des quartiers de Port-Vendres, Sète, Martigues et Marseille), la pêche de la sardine s'est trouvée confrontée à de nombreuses difficultés. Avec une production proche de 11000 t seulement, la campagne sardinière 1976 s'est inscrite dans la ligne d'un certain déclin de la pêche de ce petit pélagique qui, se manifestant depuis six ans, a ramené le niveau de production à celui des années 1960-1965, période de début du développement et d'organisation de cette activité.-Devant cette situation préoccupante, les pêcheurs professionnels de Méditerranée, et notamment ceux des quartiers maritimes de Sète et de Port-Vendres, avaient émis le souhait, dès 1975, de pratiquer le chalutage pélagique, technique jusqu'alors interdite par arrêté du 30 novembre 1970. L'une des principales raisons avancées par les pêcheurs pour justifier cette démarche, était que l'emploi du chalut pélagique devait permettre d'étaler la production sardinière au cours de l'année et, par conséquent, d'améliorer la commercialisation, dans la mesure où les conserveurs, non satisfaits par des approvisionnements ponctuels importants en juin-juillet et septembre-octobre dans les quartiers de Port-Vendres et de Sète, et d'octobre à janvier dans le quartier de Marseille, trouveraient ainsi une solution à leurs problèmes. Plus de 50 % des apports sont en effet débarqués dans ces 3 quartiers pendant les périodes précitées, lesquelles ne représentent que 4 mois de l'année pour chacun d'eux. A la suite de la parution d'un nouvel arrêté en date du 3 mai 1977, réglementant l'emploi du chalut pélagique sur le plan national, 2 réunions furent tenues les 29 et 31 mars à Port-Vendres et à Sète, à l'initiative de la Direction des Affaires Maritimes en Méditerranée et à laquelle participaient toutes les catégories de pêcheurs (chalutiers, senneurs, petits métiers). Ces réunions permirent d'envisager pour 1977 une campagne expérimentale destinée d'une part à examiner les possibilités de production en fonction de l'utilisation de cet engin de pêche, nouveau pour la Méditerranée française, et d'autre part à maîtriser les conditions de commercialisation des produits débarqués. 1. Conditions de déroulement de la campagne. Les principales conditions qui ont été définies lors des réunions tenues à Port-Vendres et à Sète les 29 et 31 mars 1977 peuvent se résumer de la manière suivante. a) Le nombre des navires autorisés à pratiquer le chalutage pélagique «en boeuf», procédé choisi de préférence au chalutage pélagique à un seul bateau, est limité à 10 couples pour le quartier de Port-Vendres, 6 couples pour celui de Sète.
... contribué à l'élaboration de cet ouvrage, en particulier Nicole Lacroix, Patricia Ba... more ... contribué à l'élaboration de cet ouvrage, en particulier Nicole Lacroix, Patricia Barthélémy, Isabelle Peronnet, ManeJiennette Dubuit, Loic Antoine, Pierre Duval ... Ces panneaux sont soit fixés direc-tement sur les ailes du chalut (chaluts à cre-vettes), soit reliés à ces dernières par ...
Materials and accessories Fishing gear and operations Equipment for deck and wheelhouse Fishing v... more Materials and accessories Fishing gear and operations Equipment for deck and wheelhouse Fishing vessel operations Formulae and tables Ordering equipment Index.
Scientia Marina, 2002
An international bottom trawl survey (the MEDITS programme) has been carried out every year in th... more An international bottom trawl survey (the MEDITS programme) has been carried out every year in the Mediterranean since 1994. During each survey, about 1000 hauls are done by a fleet of 8 to 11 vessels from 10 to 800 m depth, applying a unique standardized sampling protocol. This study analyses the trajectory and the performances of the sampling gear used for this survey, from records obtained during the surveys aboard some vessels in different geographical sub-areas and at different depth levels. Two kinds of sensors have been used, one to characterize a posteriori the vertical trajectory of the trawl from the beginning of shooting to the end of hauling (830 hauls), the other to describe in real time the stabilization of the trawl at its beginning (16 hauls) and its geometry during the tow (840 hauls). The results show the variability extent of these parameters linked with vessel, area, depth and period, illustrating their impact on the swept area estimates used for biological asses...
Aquatic Living …, 1999
The aim of the work presented in this paper was to assess the relative efficiency of the GOC 73 s... more The aim of the work presented in this paper was to assess the relative efficiency of the GOC 73 sampling trawl used for the Mediterranean international trawl survey programme (MEDITS) compared with that of a typical Italian commercial trawl. The latter was chosen because it is ...
Aquatic Living Resources, 1999
Escapement through the body or under the footrope of the sampling trawl used for the Mediterranea... more Escapement through the body or under the footrope of the sampling trawl used for the Mediterranean international trawl survey programme (MEDITS) was assessed i) by means of visual observations performed with a towed operating vehicle equipped with a high-sensitivity video camera, and ii) by attaching small bags to the outside of the trawl body and under the footrope. Due to the small size of most of the individuals present in the study area and to the towing speed, fish behaviour in front of the trawl could not be frequently observed. In contrast, their behaviour was easily observed inside the net, especially upstream and inside the codend. Sorne species, such as horse mackerel (Trachurus sp.), showed greater swimming endurance compared with others such as annular seabream (Diplodus annularis). In three fishing trips conducted in different seasons in 1996 and 1997 to obtain data on several species in different areas of the Adriatic, six small net bags were mounted outside the body of the MEDITS trawl to quantify escapement through the trawl belly and under the footrope. Significant escapement of many species occurred in the near-bottom part of the side panels. Norway lobster (Nephrops norvegicus) had the highest rate (64 %), mainly represented by small-size individuals. The escapement of greater forkbeard (Phycis blennoides) was also high (53 %). For hake (Merluccius merluccius), common pandora (Pagellus erythrinus) and poor cod (Trisopterus minutus capelanus), rates ranged from 10 to 16 %. The escapement of red mullet (Mullus barbatus) was very low despite their great abundance. Blue whiting (Micromesistius poutassou) escaped mainly through the mid-height part of the side panel. This great variability of escapement values could affect the proportion rates of the species sampled during a standard survey. Different escape behaviours among size classes were observed for M. poutassou, T. minutus capelan us and P. erythrinus, with smaller individuals tending to escape towards the bottom and larger ones towards the higher parts of the trawl body. In the species where the escape rate was size-dependent, therefore, the size-frequency distributions obtained from the codend catch may not reflect actual size-frequency distributions. © Ifremer/CnrslInra/lrdlCemagreflElsevier, Paris Survey trawl selectivity 1 trawl escapement 1 bottom trawls 1 experimental fishing 1 underwater observations 1 Mediterranean
Aquatic Living Resources, 1999
Escapement through the body or under the footrope of the sampling trawl used for the Mediterranea... more Escapement through the body or under the footrope of the sampling trawl used for the Mediterranean international trawl survey programme (MEDITS) was assessed i) by means of visual observations performed with a towed operating vehicle equipped with a high-sensitivity video camera, and ii) by attaching small bags to the outside of the trawl body and under the footrope. Due to the small size of most of the individuals present in the study area and to the towing speed, fish behaviour in front of the trawl could not be frequently observed. In contrast, their behaviour was easily observed inside the net, especially upstream and inside the codend. Sorne species, such as horse mackerel (Trachurus sp.), showed greater swimming endurance compared with others such as annular seabream (Diplodus annularis). In three fishing trips conducted in different seasons in 1996 and 1997 to obtain data on several species in different areas of the Adriatic, six small net bags were mounted outside the body of the MEDITS trawl to quantify escapement through the trawl belly and under the footrope. Significant escapement of many species occurred in the near-bottom part of the side panels. Norway lobster (Nephrops norvegicus) had the highest rate (64 %), mainly represented by small-size individuals. The escapement of greater forkbeard (Phycis blennoides) was also high (53 %). For hake (Merluccius merluccius), common pandora (Pagellus erythrinus) and poor cod (Trisopterus minutus capelanus), rates ranged from 10 to 16 %. The escapement of red mullet (Mullus barbatus) was very low despite their great abundance. Blue whiting (Micromesistius poutassou) escaped mainly through the mid-height part of the side panel. This great variability of escapement values could affect the proportion rates of the species sampled during a standard survey. Different escape behaviours among size classes were observed for M. poutassou, T. minutus capelan us and P. erythrinus, with smaller individuals tending to escape towards the bottom and larger ones towards the higher parts of the trawl body. In the species where the escape rate was size-dependent, therefore, the size-frequency distributions obtained from the codend catch may not reflect actual size-frequency distributions. © Ifremer/CnrslInra/lrdlCemagreflElsevier, Paris Survey trawl selectivity 1 trawl escapement 1 bottom trawls 1 experimental fishing 1 underwater observations 1 Mediterranean