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  • 1
    Publication Date: 2022-01-14
    Description: Commission Decision of 25 February 2016 setting up a Scientific, Technical and Economic Committee for Fisheries, C(2016) 1084, OJ C 74, 26.2.2016, p. 4–10. The Commission may consult the group on any matter relating to marine and fisheries biology, fishing gear technology, fisheries economics, fisheries governance, ecosystem effects of fisheries, aquaculture or similar disciplines. This report is from STECF Expert Working Group 21-15: 2021 stock assessments of demersal stocks in Adriatic, Ionian and Aegean Seas from the meeting held remotely from 18th to 22th October 2021. A total of 9 fish stocks were evaluated. One stock had prior advice from 2020 for 2021 and 2022, and this is reiterated here. Index advice for 2022 and 2023 is provide for one other stock. The EWG reports age based assessments and short term forecasts for 5 of the remaining 7 stocks and surplus production assessments for two stocks. The content of the report gives the STECF terms of reference, the basis of the evaluations and advice, summaries of state of stock and advised based on either the MSY approach for assessed stocks or the precautionary approach for category 3 based advice. The report contains the full stock assessment reports for the 7 assessments, the exploration of assessments and category 3 evaluations for the remaining five stocks. The report also contains the STECF observations and conclusions on the assessment report. These conclusions come from the STECF Plenary meeting November 2021.
    Description: European Commission
    Description: European Union, Joint Research Centre
    Description: Published
    Description: Refereed
    Keywords: Fisheries economics ; Fisheries biology ; Fisheries governance ; Fishing gear technology ; Fish stock assessment ; Management advice ; MSY ; Modelling
    Repository Name: AquaDocs
    Type: Report
    Format: 467pp
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  • 2
    Publication Date: 2022-01-14
    Description: The working group was held in remotely, from 12th to 20th Sept 2020. The meeting was attended by 14 experts in total, including two STECF member and two JRC experts. The EWG had two observers who attended part time. The objective of the Mediterranean Methodology EWG 20-15 was to carry out assessments and provide draft advice for stocks identified in the ToR supplied by STECF. An initial plenary session commenced at 09:30 on the first day. The ToRs were discussed and examined in detail. Stocks were allocated to participants based on expertise. An ftp repository was created ad-hoc to share documents, data and scripts and prepare the report. The stocks were evaluated by the GSA groups identified in the ToRs. Most of the work was concluded by Tuesday 20 Sept, after 7 full days of work, and some additional work at the weekend. Over the 7 working days plenary sessions were held each day to monitor progress and share results. The overall conclusions for each stock were discussed and finalized in plenary on the Tuesday.
    Description: European Commission
    Description: European Union, Joint Research Centre
    Description: Published
    Description: Refereed
    Keywords: Fish stock assessment ; Fisheries biology ; Fisheries economics ; Fisheries governance ; Fishing gear technology ; Management advice ; Modelling ; MSY
    Repository Name: AquaDocs
    Type: Report
    Format: 592pp
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  • 3
    Publication Date: 2022-01-14
    Description: The working group was held in remotely, from 6th to 10th Sept 2021. The meeting was attended by 20 experts in total, including two STECF members and two JRC experts along with one observer. The objective of the Mediterranean Methodology EWG 21-11 was to carry out assessments and provide draft advice for stocks identified in the ToR supplied by STECF. An initial plenary session commenced at 09:00 on the first day. The ToRs were discussed and examined in detail. Stocks were allocated to participants based on expertise. An ad-hoc ftp repository was created to share documents, data and scripts and prepare the report. The stock assessments were evaluated by all participants. Following EWG 21-02 data preparation EWG data was available for assessments much earlier in the meeting, in all cases by Tuesday night. For stocks with assessment issues some sensitivity test were possible, but for DWRS in GSA 1,5,6,7 exploratory assessments were not fully concluded given time limitations. Over the week plenary sessions were held each day to monitor progress and share results. The overall conclusions for each stock were discussed and finalized in plenary on the Friday. After the main meeting it became apparent that the selected assessment for red and blue shrimp in GSA 1 had issues with the form of the model, the model was re-examined and details circulated to all EWG participants. A short 45minute plenary was held on Tuesday 21st and a revised assessment was agreed. This report contains this final assessment and advice based on it.
    Description: European Commission
    Description: European Union, Joint Research Centre
    Description: Published
    Description: Refereed
    Keywords: Fish stock assessment ; Fisheries biology ; Fisheries economics ; Fisheries governance ; Fishing gear technology ; Management advice ; Modelling ; MSY
    Repository Name: AquaDocs
    Type: Report
    Format: 678pp
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  • 4
    Publication Date: 2022-01-13
    Description: Commission Decision of 25 February 2016 setting up a Scientific, Technical and Economic Committee for Fisheries, C(2016) 1084, OJ C 74, 26.2.2016, p. 4–10. The Commission may consult the group on any matter relating to marine and fisheries biology, fishing gear technology, fisheries economics, fisheries governance, ecosystem effects of fisheries, aquaculture or similar disciplines. . This report is from STECF Expert Working Group 19-16: 2019 stock assessments of demersal stocks in the Adriatic Sea from the meeting in Rome Italy from 14th to 20th October 2019. A total of seven fish species were evaluated for GSA 17, 18 and 19. The EWG reports age based assessments and short term forecasts for all seven stocks. The content of the report gives the STECF terms of reference, the basis of the evaluations and advice, summaries of state of stock and advised based on either the MSY approach for assessed. The report contains the full stock assessment reports for the seven assessments, and three exploratory assessments for deep-water rose shrimp for each GSA separately. Advice for deep-water rose shrimp is based on the combined stock, the report also contains the STECF observations and conclusions on the assessment report. These conclusions come from the STECF Plenary meeting November 2019.
    Description: European Commission
    Description: European Union, Joint Research Centre
    Description: Published
    Description: Refereed
    Keywords: Fish stock assessment ; Modelling ; Management advice ; Fisheries biology ; Fishing gear technology ; Fisheries economics ; Fisheries governance ; Ecosystem effects of fisheries ; MSY
    Repository Name: AquaDocs
    Type: Report
    Format: 380pp.
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  • 5
    Publication Date: 2022-01-13
    Description: The working group was held in remotely, from 7th to 18th Sept 2020. The meeting was attended by 21 experts in total, including three STECF members and four JRC experts. The EWG had two observers who attended part time. The objective of the Mediterranean Methodology EWG 20-09 was to carry out assessments and provide draft advice for stocks identified in the ToR supplied by STECF. An initial plenary session commenced at 09:30 on the first day. The ToRs were discussed and examined in detail. Stocks were allocated to participants based on expertise. An ftp repository was created ad-hoc to share documents, data and scripts and prepare the report. The stock assessments were evaluated by the by all participants. Most of the work was concluded by Tuesday 15 Sept, after 7 full days of work, and some additional work at the weekend. However, two stocks remained to be completed, this extra work was carried out largely by two participant with support from small subgroups. The WG met for a final session on Friday 18 Sept. to conclude the work on one stock. Following extensive trials the last stock could not be assessed with an analytic age based assessment and advice was based on the MEDITS index. Over the first 7 working days plenary sessions were held each day to monitor progress and share results. The overall conclusions for each stock were discussed and finalized in plenary on the Tuesday, though the last assessment was finalised on the following Friday, the last day of the meeting.
    Description: European Commission
    Description: European Union, Joint Research Centre
    Description: Published
    Description: Refereed
    Keywords: Stock assessment ; Management advice ; MSY ; Fisheries biology ; Fisheries economics ; Fisheries governance ; Fishing gear technology
    Repository Name: AquaDocs
    Type: Report
    Format: 707pp.
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  • 6
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Journal of Insect Physiology 36 (1990), S. 743-745+747-756 
    ISSN: 0022-1910
    Keywords: Helicoverpa armigera ; Heliothis virescens ; Spodoptera frugiperda ; Spodoptera littoralis ; adult feeding ; amino acids ; azadirachtin ; behaviour ; electrophysiology ; neural interactions ; plant extracts ; sugars ; tarsal chemoreceptors
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology
    Type of Medium: Electronic Resource
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  • 7
    ISSN: 1570-7458
    Keywords: Secondary plant compounds ; 2,5-dihydroxymethyl ; 3,4-dihydroxypyrrolidine ; Spodoptera littoralis ; S. exempta ; Heliothis virescens ; Schistocerca gregaria ; Locusta migratoria
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Résumé Récemment a été mis en évidence le puissant pouvoir inhibiteur de différents glucosidases. Présenté par l'amino-alditol cyclique, 2,5 dihydroxymethyl 3,4 dihydroxypyrrolidine (DMDP), isolé de graines de la légumineuse Lonchocarpus sericeus. Nous avons examiné le rôle de ce composé secondaire dans la stratégie défensive de la plante contre une gamme d'insectes phytophages, à travers son action sur le développement, le comportement alimentaire et le fonctionnement des récepteurs gustatifs. Nous avons montré que DMDP peut inhiber, suivant la dose, la prise de nourriture et, qu'apr⪻s ingestion (par Spodoptera spp), il peut agir comme une toxine. Par suite de sa structure moléculaire, DMDP peut être considéré, non seulement comme l'analogue d'un sucre, mais aussi comme un alcaloïde. Le bilan des résultats de nos expériences suggère que l'efficacité de DMDP comme phagodissuadant, si elle ne provient pas de sa toxicité, découle principalement de ses propriétés d'alcaloïde.
    Notes: Abstract The cyclic amino alditol 2,5-dihydroxymethyl 3,4-dihydroxypyrrolidine (DMDP) has recently been shown to be an inhibitor of various glucosidases. We have investigated its role as a plant protective chemical against a range of phytophagous insects by examining its effects on development, feeding behaviour and functioning of taste receptors. We have shown that it can inhibit feeding and can be toxic. The mechanisms by which these effects are achieved are discussed in the context of the molecular structure of the compound.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Entomologia experimentalis et applicata 55 (1990), S. 149-160 
    ISSN: 1570-7458
    Keywords: Spodoptera littoralis ; Spodoptera frugiperda ; Heliothis virescens ; Heliothis armigera ; azadirachtin ; salannin ; limonoids ; antifeedants
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Résumé L'activité phagodissuadante de l'azadirachtine, de ses dérivés et des limonoïdes voisins sur 4 espèces de lépidoptères: Spodoptera littoralis, S. frugiperda, Heliothis virescens et H. armigera a été évaluée par des expériences avec et sans choix. Les expériences de choix ont montré que le comportement alimentaire de S. littoralis était modifié par plus de substances que celui de S. frugiperda ou H. virescens. Celui de H. armigera était le moins modifié. Les 2 substances les plus puissantes parmi les 40 examinées, ont été l'azadirachtine et le dihydroazadirachtine. Ces résultats montrent que l'hydrogénation de la double liaison C-22,23 ne réduit pas l'activité phagodissuadante et que la nature des substitutions en C-1, C-3 et C-11 sont importantes. Les molécules avec des substitutions volumineuses en C-22 ou C-23 sont généralement des phagodissuadants aussi inefficaces que ceux ayant perdu un époxide. Les substances notées comme phagodissuadants actifs dans les expériences de choix ne sont pas toujours aussi actives en absence de choix. La valeur des tests dans l'évaluation du mode d'action des substances est discuté.
    Notes: Abstract The antifeedant activity of azadirachtin, azadirachtin-derivatives and related limonoids was assessed in choice and no-choice bioassays against four species of Lepidoptera: Spodoptera littoralis, Spodoptera frugiperda, Heliothis virescens and Heliothis armigera. The choice bioassay showed that the feeding behaviour of S. littoralis was affected by more of the compounds than that of either S. frugiperda or H. virescens. H. armigera was the least affected. Azadirachtin and dihydroazadirachtin were the most potent of the 40 compounds tested. The results showed that hydrogenation of the C-22,23 double bond did not decrease antifeedant activity and the nature of the substitutes at C-1, C-3 and C-11 were important. Molecules with bulky substitutes at either C-22 or C-23 were usually ineffective antifeedants as were compounds lacking an epoxide. Compounds recorded as active antifeedants in the choice bioassay were not always as active in the no-choice test. The value of the bioassays in assessing the mode of action of the compounds is discussed.
    Type of Medium: Electronic Resource
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  • 9
    ISSN: 1570-7458
    Keywords: Azadirachtin ; Spodoptera littoralis ; Spodoptera frugiperda ; Heliothis virescens ; growth disruption ; oral cannulation ; abdominal injection ; topical application
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Résumé Spodoptera littoralis, S. frugiperda et Heliothis virescens ont été exposés à l'azadirachtine et 23 autres substances voisines dans 3 expériences: canulation orale, injection d'haemolymphe et application topique. S. littoralis est sensible à un plus grand nombre de substances que les 2 autres espèces. De toutes façons, les substances les plus actives ont été l'azadirachtine, la 22,23-dihydroazadirachtine et la 1-détigloyl-22,23-dihydroazadirachtine. La nature des substitutions en C-1 et C-3 de l'anneau décaline modifie la puissance des substances, tout comme les substitutions en C-22,23. D'une façon générale, les chenilles ont été moins sensibles aux applications topiques qu'aux canulations dans le tube digestif ou aux injections dans l'haemolymphe.
    Notes: Abstract Spodoptera littoralis, Spodoptera frugiperda and Heliothis virescens were exposed to azadirachtin and 23 other related compounds in three bioassays: oral cannulation, haemolymph injection and topical application. Spodoptera littoralis was susceptible to a larger proportion of the compounds than either of the other species. Overall, azadirachtin, 22,23-dihydroazadirachtin and 1-detigloyl-22,23-dihydroazadirachtin were the most active compounds. The nature of the substitutes at C-1 and C-3 of the decalin ring affects the potency of the compounds, as does the addition of substitutes to C-22,23. Generally, larvae were less sensitive to compounds when they were topically applied than when they were cannulated into the gut or injected into the haemolymph.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Springer
    Entomologia experimentalis et applicata 49 (1988), S. 111-121 
    ISSN: 1570-7458
    Keywords: Spodoptera littoralis ; Heliothis virescens ; H. armigera ; electrophysiology ; feeding behaviour ; adults ; larvae ; proboscis sensilla ; antifeedants ; phagostimulants
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Adults and larvae of Spodoptera littoralis, Heliothis virescens and Heliothis armigera were tested with a range of sugars, amino acids, sugar alcohols and allelochemics. Feeding behaviour was correlated with the electrophysiological responses of maxillary styloconic sensilla in the larvae and proboscis styloconic sensilla in the adult. The neural response was more vigorous in larvae than in adults but otherwise the spectra of responses were similar in the two life stages. Phagostimulants and antifeedants stimulated maximally different sensilla in larvae but not in adults. The responses of adult sensilla to sugars and amino acids were significantly correlated to behaviour in all three species, but only in H. armigera was there a similar correlation with the sugar alcohols and allelochemics.
    Type of Medium: Electronic Resource
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