Estimation des flux d’anguilles argentées

Marquage d’anguilles argentées avec le MNHN – Bouchemaine © Mathieu Bodin

Pêche en Loire de l’anguille argentée au guideau – La Ménitré © Mathieu Bodin

Le bassin de la Loire est le seul en Europe à disposer d’une longue série chronologique portant sur l’abondance des géniteurs d’anguilles (anguilles argentées ou de dévalaison). Initié en 1987 sous l’impulsion de Philippe Boisneau, ce suivi des captures au guideau est un outil indispensable d'aide à la gestion de l’espèce, et à la compréhension du pattern de migration. A chaque saison de pêche (du 1er octobre au 15 février, du lundi 6h au samedi 18h), l’association traite les données de captures de l’ensemble de la flotte autorisée (7 guideaux en 2020), réalise des suivis biométriques (Lt, Pt, critères d’argenture) et procède à des éviscérations de vessies pour étudier la prévalence du parasite Anguillicola crassus.

Les données de captures de quatre pêcheries de référence (entre Montjean-sur-Loire et Ancenis) sont étudiées et analysées par l’Université de Tours pour déterminer un indice annuel d’abondance.

Parallèlement à ce cet indice d’abondance, depuis 2001, plusieurs campagnes de Capture-Marquage-Recapture (CMR) sont menées par la station marine du MNHN de Dinard. En utilisant les guideaux, les pêcheurs professionnels et les chercheurs, dirigés par le Professeur Éric Feunteun, capturent, marquent et relâchent des anguilles. Le nombre d’anguilles marquées recapturées, étudié en fonction du nombre total d’anguilles capturées sur la saison de pêche, permet d’établir une estimation des flux dévalants, en amont d’Ancenis et en période réglementaire de pêche. En 2019, un suivi expérimental de dévalaison ‘post-fermeture’ (du 16 février au 30 septembre) a permis d’obtenir des informations précieuses sur l’apport de ces migrations tardives dans le cortège migrant annuel et sur les conditions hydro-climatiques propices ou non à la dévalaison printanière.

Ces différents suivis permettent également de déterminer le taux d’exploitation de la pêcherie professionnelle en Loire sur la phase argentée de l’anguille (un guideau capte environ 1% du flux dévalant) et ainsi relativiser l’impact de cette activité parmi tous les autres facteurs de pression (discontinuité écologique, pollution, prédation, bouchon vaseux, pêche de loisirs, sécheresse, prélèvements d’eau…).

Mais l’application de la relève hebdomadaire (pêche interdite du samedi 18h au lundi 6h pendant toute la campagne de pêche, soit -28% du temps de pêche), comme imposé par le Règlement Anguille de la Commission Européenne (CE n°1100/2007), a eu un effet direct sur la pérennité du suivi engagé depuis 1987. Pour compenser la perte d’information sur la migration en période de relève hebdomadaire, l’association a porté ce suivi pluriannuel dans le cadre de l’appel à projets migrateurs de la DREAL Centre-Val de Loire avec le financement de quelques nuits, par guideau, de pêches scientifiques de relève hebdomadaire (capture, comptage puis remise à l’eau de toutes les anguilles).

La pêcherie d’anguilles argentées en Loire est la seule en Europe à disposer d’une estimation de flux provenant d’un grand bassin hydrographique. Reconnue par les instances européennes, elle permet d’alimenter et calibrer le modèle EDA (Eel Density Analysis), avec d’autres données de rivières index de plus petites tailles.

Dans le cadre des Appels à Projets Migrateurs, les suivis de dévalaison des anguilles en Loire sont financés par l'Agence de l'Eau Loire-Bretagne et le FEDER Loire.

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16	SELECT p.id, p.user_id, p.category_id, p.active, p.created_at, p.updated_at, p.images, p.files, p.tpl, p.position, pl.language, pl.title, pl.subtitle, pl.title_tag, pl.title_seo, pl.slug, pl.content, pl.meta_description, pl.meta_keywords, pl.words, rl.title AS category_title, rl.slug AS category_slug, rl.title_tag AS category_title_tag, r.items_tpl AS category_items_tpl, p.recipients_to, p.recipients_cc, p.recipients_bcc, p.from_to, p.captcha, p.conversion_google, p.from_copy, pl.subject FROM oktopusV1_mod_pages AS p INNER JOIN oktopusV1_mod_pages_locales AS pl ON p.id=pl.page_id AND pl.language='fr' LEFT OUTER JOIN oktopusV1_mod_pages_categories AS r ON r.id=p.category_id LEFT OUTER JOIN oktopusV1_mod_pages_categories_locales AS rl ON r.id=rl.category_id AND rl.language='fr' WHERE 1 AND pl.language='fr' AND p.active=1 ORDER BY p.created_at DESC	0.00042
17	`SELECT f.id, f.page_id, f.active, f.type, f.ord, f.html_id, f.bloc, f.colonne, f.picto, f.options, f.info_personnelle, fl.language, fl.title, fl.description, fl.value, fl.legend FROM oktopusV1_mod_pages_forms_fields AS f LEFT JOIN oktopusV1_mod_pages_forms_fields_locales AS fl ON fl.field_id=f.id WHERE 1 AND active>0 AND page_id=35 AND fl.language='fr' ORDER BY ord ASC`	0.00072
18	`SELECT DISTINCT sn., snl. FROM oktopusV1_mod_social_network sn JOIN oktopusV1_mod_social_network_locales snl ON snl.id_social_network = sn.id_social_network AND snl.language = 'fr' WHERE 1 AND sn.url != '' AND sn.type != '' AND type LIKE '%F%' ORDER BY sn.position`	0.00061
19	SELECT t.*, DATE_FORMAT(t.date_creation, '%d/%m/%Y %H:%i:%s') as date_creation_fr, DATE_FORMAT(t.date_modification, '%d/%m/%Y %H:%i:%s') as date_modification_fr FROM oktopusV1_mod_slideshow_type t WHERE 1 AND CASE WHEN t.choix_rubrique = 1 THEN t.rubrique LIKE '%\'/estimation-des-flux-danguilles-argentees\'%' WHEN t.choix_rubrique = 2 THEN ( SELECT COUNT(t.id_type) FROM oktopusV1_mod_slideshow_type t WHERE t.choix_rubrique = 1 AND t.rubrique LIKE '%\'/estimation-des-flux-danguilles-argentees\'%' AND t.actif = 1 ) = 0 AND t.rubrique NOT LIKE '%\'/estimation-des-flux-danguilles-argentees\'%' ELSE ( SELECT COUNT(t.id_type) FROM oktopusV1_mod_slideshow_type t WHERE t.choix_rubrique = 1 AND t.rubrique LIKE '%\'/estimation-des-flux-danguilles-argentees\'%' AND t.actif = 1 ) = 0 END AND actif = '1' ORDER BY nom	0.00037
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22	`SELECT f.id, f.active, f.type, f.category, f.ord, f.html_id, f.colonne, f.picto, f.options, f.info_personnelle, fl.title, fl.legend, fl.description, fl.value FROM oktopusV1_mod_contact_fields f LEFT JOIN oktopusV1_mod_contact_fields_locales AS fl ON fl.field_id=f.id AND fl.category=f.category WHERE 1 AND f.active>0 AND f.category = "insert" AND fl.language='fr' ORDER BY ord ASC`	0.00033

Query

Time

SET NAMES utf8mb4

0.00004

SELECT u.*, g.* FROM oktopusV1_core_users AS u INNER JOIN
oktopusV1_core_users_groups AS g ON g.group_id=u.group_id
WHERE u.id=1

0.00078

SHOW TABLES LIKE 'oktopusV1_mod_oktopusagent_settings'

0.00022

SHOW TABLES LIKE 'oktopusV1_mod_oktopusagent_settings'

0.00017

SELECT setting_name, setting_value FROM
oktopusV1_mod_oktopusagent_settings

0.00049

SHOW TABLES LIKE 'oktopusV1_mod_oktopusagent_settings'

0.00017

SHOW TABLES LIKE 'oktopusV1_mod_oktopusagent_settings'

0.00016

SHOW TABLES LIKE 'oktopusV1_mod_oktopusagent_settings'

0.00015

SHOW TABLES LIKE 'oktopusV1_mod_oktopusagent_settings'

0.00015

UPDATE oktopusV1_mod_news SET active = 1
                           WHERE active = 3 AND NOW() >
created_at

0.00042

UPDATE oktopusV1_mod_news SET active = 0
                              WHERE active = 1 AND end_at !=
"0000-00-00 00:00:00" 
                              AND NOW() > end_at

0.00011

SELECT p.id, p.user_id, p.category_id, p.active,
p.created_at, p.updated_at, p.images, p.files, p.tpl,
p.position, pl.language, pl.title, pl.subtitle,
pl.title_tag, pl.title_seo, pl.slug, pl.content,
pl.meta_description, pl.meta_keywords, pl.words, rl.title AS
category_title, rl.slug AS category_slug, rl.title_tag AS
category_title_tag, r.items_tpl AS category_items_tpl,
p.recipients_to, p.recipients_cc, p.recipients_bcc,
p.from_to, p.captcha, p.conversion_google, p.from_copy,
pl.subject FROM oktopusV1_mod_pages AS p  INNER JOIN
oktopusV1_mod_pages_locales AS pl ON p.id=pl.page_id AND
pl.language='fr'  LEFT OUTER JOIN
oktopusV1_mod_pages_categories AS r ON r.id=p.category_id 
LEFT OUTER JOIN oktopusV1_mod_pages_categories_locales AS rl
ON r.id=rl.category_id AND rl.language='fr' WHERE 1  AND
pl.language='fr'  AND
pl.slug='estimation-des-flux-danguilles-argentees' AND
p.active=1 ORDER BY p.created_at DESC

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SELECT m.*, 
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ml.title_tag, ml.title_seo, ml.slug, ml.meta_description,
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LEFT JOIN oktopusV1_mod_map_locales AS ml ON m.id=ml.id_map
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m.active=1 ORDER BY m.created_at DESC

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SELECT c.id, c.active, c.ord, c.parent_id, c.level, c.tpl,
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SELECT DISTINCT snr.*, snrl.*, 
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oktopusV1_mod_social_network_reseau_locales snrl ON
snrl.id_reseau = snr.id_reseau AND snrl.language = 'fr'
WHERE 1  AND active = '1' ORDER BY snrl.libelle

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SELECT p.id, p.user_id, p.category_id, p.active,
p.created_at, p.updated_at, p.images, p.files, p.tpl,
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pl.title_tag, pl.title_seo, pl.slug, pl.content,
pl.meta_description, pl.meta_keywords, pl.words, rl.title AS
category_title, rl.slug AS category_slug, rl.title_tag AS
category_title_tag, r.items_tpl AS category_items_tpl,
p.recipients_to, p.recipients_cc, p.recipients_bcc,
p.from_to, p.captcha, p.conversion_google, p.from_copy,
pl.subject FROM oktopusV1_mod_pages AS p  INNER JOIN
oktopusV1_mod_pages_locales AS pl ON p.id=pl.page_id AND
pl.language='fr'  LEFT OUTER JOIN
oktopusV1_mod_pages_categories AS r ON r.id=p.category_id 
LEFT OUTER JOIN oktopusV1_mod_pages_categories_locales AS rl
ON r.id=rl.category_id AND rl.language='fr' WHERE 1  AND
pl.language='fr' AND p.active=1 ORDER BY p.created_at DESC

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SELECT f.id, f.page_id, f.active, f.type, f.ord, f.html_id,
f.bloc, f.colonne, f.picto, f.options, f.info_personnelle,
fl.language, fl.title, fl.description, fl.value, fl.legend
FROM oktopusV1_mod_pages_forms_fields AS f  LEFT JOIN
oktopusV1_mod_pages_forms_fields_locales AS fl ON
fl.field_id=f.id WHERE 1  AND active>0  AND page_id=35 AND
fl.language='fr' ORDER BY ord ASC

0.00072

SELECT DISTINCT sn.*, snl.*
                      FROM oktopusV1_mod_social_network sn
                      JOIN
oktopusV1_mod_social_network_locales snl ON
snl.id_social_network = sn.id_social_network AND
snl.language = 'fr' WHERE 1  AND sn.url != '' AND sn.type !=
''  AND type LIKE '%F%' ORDER BY sn.position

0.00061

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                            DATE_FORMAT(t.date_creation,
'%d/%m/%Y %H:%i:%s') as date_creation_fr,
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'%d/%m/%Y %H:%i:%s') as date_modification_fr
                       FROM oktopusV1_mod_slideshow_type t
                       WHERE 1 AND CASE 
                                       WHEN t.choix_rubrique
= 1 THEN
                                           t.rubrique LIKE
'%\'/estimation-des-flux-danguilles-argentees\'%'
                                       WHEN t.choix_rubrique
= 2 THEN
                                          
                   (  SELECT COUNT(t.id_type) FROM
oktopusV1_mod_slideshow_type t
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t.rubrique LIKE
'%\'/estimation-des-flux-danguilles-argentees\'%' AND
t.actif = 1
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                                           AND
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LIKE '%\'/estimation-des-flux-danguilles-argentees\'%'
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                   (  SELECT COUNT(t.id_type) FROM
oktopusV1_mod_slideshow_type t
                      WHERE t.choix_rubrique = 1 AND
t.rubrique LIKE
'%\'/estimation-des-flux-danguilles-argentees\'%' AND
t.actif = 1
                   ) = 0
                 
                                   END AND actif = '1' ORDER
BY nom

0.00037

SELECT t.*, 
                        DATE_FORMAT(t.date_creation,
'%d/%m/%Y %H:%i:%s') as date_creation_fr,
                        DATE_FORMAT(t.date_modification,
'%d/%m/%Y %H:%i:%s') as date_modification_fr 
                     FROM oktopusV1_mod_slideshow_type t
                     WHERE t.id_type = '7'

0.00008

 SELECT p.*, pl.valeur AS legende, pl.lien,
pl.contenu_titre,  pl.contenu_ss_titre,
pl.contenu_description, pl.primaire_texte,
pl.primaire_texte_mobile, pl.secondaire_texte,
pl.secondaire_texte_mobile, pl.primaire_slug,
pl.secondaire_slug, pl.lien2,  
                          DATE_FORMAT(p.date_creation,
'%d/%m/%Y %H:%i:%s') as date_creation_fr,
                          DATE_FORMAT(p.date_modification,
'%d/%m/%Y %H:%i:%s') as date_modification_fr
                       FROM oktopusV1_mod_slideshow p
                       LEFT JOIN
oktopusV1_mod_slideshow_locales pl ON pl.id_slideshow =
p.id_slideshow AND pl.language = 'fr'
                       WHERE 1 AND p.actif = '1' AND id_type
= '7' ORDER BY position

0.00037

SELECT f.id, f.active, f.type, f.category, f.ord, f.html_id,
f.colonne, f.picto, f.options, f.info_personnelle, fl.title,
fl.legend, fl.description, fl.value FROM
oktopusV1_mod_contact_fields f LEFT JOIN
oktopusV1_mod_contact_fields_locales AS fl ON
fl.field_id=f.id AND fl.category=f.category WHERE 1  AND
f.active>0  AND f.category = "insert" AND fl.language='fr'
ORDER BY ord ASC

0.00033

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array ( 'title' => array ( 'fr' => 'PêchePro-LoireBretagne', ), 'desc' => array ( 'fr' => 'AAPPBLB, est l\'association agréée des pécheurs professionnels en eau douce du bassin Loire-Bretagne (AAPPBLB) - Asso PêchePro-LoireBretagne', ), 'title_tag' => array ( 'fr' => '', ), 'meta_description' => array ( 'fr' => 'AAPPBLB, est l\'association agréée des pécheurs professionnels en eau douce du bassin Loire -bretagne (aappblb) Pêche dans la ville de La Pommeraye.', ), 'meta_keywords' => array ( 'fr' => 'association pecheurs professionnels Montjean-sur-Loire, association pêche Montjean-sur-Loire, pêche professionnelle Montjean-sur-Loire, association pêcheur Montjean-sur-Loire, réglementation de la pêche Montjean-sur-Loire, poissons migrateurs Montjean-sur-Loire, pêcheur professionnel Montjean-sur-Loire, association pecheurs professionnels Maine-et-Loire (49), association pêche Maine-et-Loire (49), pêche professionnelle Maine-et-Loire (49), association pêcheur Maine-et-Loire (49), réglementation de la pêche Maine-et-Loire (49), poissons migrateurs Maine-et-Loire (49), pêcheur professionnel Maine-et-Loire (49), association pecheurs professionnels Bretagne, association pêche Bretagne, pêche professionnelle Bretagne, association pêcheur Bretagne, réglementation de la pêche Bretagne, poissons migrateurs Bretagne, pêcheur professionnel Bretagne, association pecheurs professionnels, association pêche, pêche professionnelle, association pêcheur, réglementation de la pêche, poissons migrateurs, pêcheur professionnel, association pecheurs professionnels, association pêche Loire, pêche Loire, pêche Bretagne, association pêcheur, bassin Loire Bretagne, pêche professionnelle, Patrimoine, UNESCO, nasse Filet guideau filet-barrage Tourisme, Pêche, Loire-Bretagne, Anguille, Alose, friture, pêcheur professionnel, AAPPBLB, silure, pescatourisme, rillettes, garum, Patrimoine UNESCO nasse, Filet guideau filet-barrage, Tourisme, Pêche, Loire, Bretagne, Anguille, Alose friture 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Estimation des flux d’anguilles argentées

_GET

_REQUEST

Variables dans le scope global

Constantes

Configuration

Variables utilisateur