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Report of the Workshop on Sexual Maturity Staging of Elasmobranchs (WKMSEL)

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Report of the Workshop on Sexual Maturity Staging of Elasmobranchs (WKMSEL) WKMSEL REPORT 2010 ICES ADVISORY COMMITTEE ICES CM 2010/ACOM:48 Report of the Workshop on Sexual Maturity Staging of Elasmobranchs (WKMSEL) 11-15 October 2010 Valetta, Malta International Council for the Exploration of the Sea Conseil International pour l’Exploration de la Mer H. C. Andersens Boulevard 44–46 DK-1553 Copenhagen V Denmark Telephone (+45) 33 38 67 00 Telefax (+45) 33 93 42 15 www.ices.dk [email protected] Recommended format for purposes of citation: ICES. 201 0. Report of the Workshop on Sexual Maturity Staging of Elasmobranches (WKMSEL), 11-15 October 2010, Valetta, Malta. ICES CM 2010/ACOM:48. 132 pp. For permission to reproduce material from this publication, please apply to the Gen- eral Secretary. The document is a report of an Expert Group under the auspices of the International Council for the Exploration of the Sea and does not necessarily represent the views of the Council. © 2010 International Council for the Exploration of the Sea WKMSEL REPORT 2010 | i Contents Executive summary ................................................................................................................ 1 Abbreviations and acronyms ............................................................................................... 2 1 Opening of the meeting ................................................................................................ 3 1.1 Opening of the meeting and adoption of the Agenda ..................................... 3 1.2 Scientific justification and aims .......................................................................... 3 1.3 Terms of Reference ............................................................................................... 4 1.4 Data Collected before the Workshop ................................................................. 4 2 Summary of Presentations ........................................................................................... 6 2.1 Contribution to Guidelines for Age Determination of Chondrichthyes fish from the Mediterranean Sea (application to selected species). ................................................................................................... 6 2.2 Oviparous species Galeus melastomus: macroscopic maturity stages of females ............................................................................................................... 6 2.3 Viviparous species: macroscopic maturity stages of females ......................... 6 2.4 Maturity scale for the viviparous cartilaginous fishes for the Tuscany area, northwest Mediterranean (south Ligurian Sea-north Tyrrhenian Sea), GSA 9 ........................................................................................ 7 2.5 The research on the reproductive biology in the cartilaginous fishes at the Italian High Institute of Environmental Protection and Research (ISPRA) .................................................................................................. 7 2.6 Macroscopic maturity scales and photos for oviparous and viviparous elasmobranch species used for the Maltese data collection system. .................................................................................................. 8 2.7 Sexual Maturity Staging of the viviparous longnose spurdog Squalus blainvillei for the Sardinian waters (Central-western Mediterranean Sea) ............................................................................................... 8 2.8 Sexual Maturity Staging of the oviparous blackmouth catshark Galeus melastomus for the Sardinian waters (Central-western Mediterranean Sea) ............................................................................................... 9 2.9 Maturity scales used for oviparous elasmobranchs (Portugal, IPIMAR) ................................................................................................................. 9 2.10 Maturity scales used for viviparous elasmobranchs (Portugal, IPIMAR) ............................................................................................................... 10 2.11 Description of the macroscopic development of the reproductive system in skates as example of elasmobranchs oviparous species .............. 10 2.12 Data collection and sexual maturity staging for Rhinobatids in the Gulf of Gabès (southern Tunisia, central Mediterranean Sea) Macroscopic maturity scale ............................................................................... 11 2.13 Length-weight relationships and length at maturity for skates (Rajidae) around the British Isles, and an overview of the collection ii | WKMSEL REPORT 2010 of reproductive data for elasmobranchs in English groundfish surveys ................................................................................................................. 11 3 The standardised macroscopic maturity scale ........................................................ 12 3.1 Oviparous maturity scales - macroscopic ....................................................... 12 3.1.1 Males ........................................................................................................ 12 3.1.2 Females .................................................................................................... 13 3.1.3 The proposal for a common macroscopic scale for Oviparous species .................................................................................. 14 3.2 Viviparous maturity scales - macroscopic ....................................................... 15 3.2.1 Males ........................................................................................................ 15 3.2.2 Females .................................................................................................... 16 3.3 The proposal for a common macroscopic scale for Viviparous species .................................................................................................................. 17 3.4 Comparison and conversion of previous maturity scales with the new one WKSMEL 2010 ..................................................................................... 19 4 Histological determination of microscopic maturity stages ................................ 23 4.1 Microscopic maturity scales .............................................................................. 23 4.2 Recommendation for histological analyses ..................................................... 24 4.2.1 Extraction ................................................................................................ 24 4.2.2 Fixation .................................................................................................... 25 4.2.3 Embedding and sectioning ................................................................... 25 4.2.4 Staining .................................................................................................... 26 5 Photo reference for the maturity scale proposed for oviparous and viviparous elasmobranch species ............................................................................. 27 6 Guidelines on optimal sampling strategy for the determination of maturity stages in elasmobranchs ............................................................................ 28 7 Conclusion and recommendations ........................................................................... 30 8 Glossary ......................................................................................................................... 31 9 References and working documents ........................................................................ 34 Annex 1: List of participants............................................................................................... 40 Annex 2: Agenda ................................................................................................................... 42 Annex 3: WKMSEL terms of reference for the next meeting 2013 .............................. 44 Annex 4: Species list with info on the study areas and mode of reproduction ................................................................................................................. 45 Annex 5: Length-weight relationships and length at maturity for skates (Rajidae) around the British Isles, and an overview of the collection of reproductive data for elasmobranchs in English groundfish surveys ............... 48 Annex 6: WKMOG 2008 Guidelines ................................................................................. 62 WKMSEL REPORT 2010 | iii Annex 7: WEBGR contact to upload photo reference library ....................................... 64 Annex 8: PGCCDBS Guidelines for Workshops on Maturity Staging ...................... 65 Annex 9: Histological procedures in use for elasmobranchs and recommendations......................................................................................................... 68 Annex 10: Histological photo reference for the maturity scale proposed for oviparous and viviparous elasmobranch species .................................................. 71 Annex 11: Macroscopic oviparous gonad reference photos .......................................... 85 Annex 12: Macroscopic viviparous gonad reference photos ...................................... 104 Annex 13: Proposed Final WKMSEL 2010 Macro maturity Scales ............................ 131 WKMSEL REPORT 2010 ∣ 1 Executive summary The European Union requires member states to collect maturity data under the Data Collection Framework (DCF) but there is no international agreement on the maturity scales to be applied to elasmobranchs.
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