Age determination of Anguilla anguilla (L.) and related species. Marking and tagging methods applied to eel, Anguilla anguilla (L.)

Leif Asbjørn Vøllestad;Raymonde Lecomte-Finiger;Bert Steinmetz;Jan Nielsen

Age determination of Anguilla anguilla (L.) and related species. Marking and tagging methods applied to eel, Anguilla anguilla (L.)

Year of publication 1988

Place of publication Rome, Italy ;

Pages 24

Author Leif Asbjørn Vøllestad;Raymonde Lecomte-Finiger;Bert Steinmetz;Jan Nielsen

Product type Book (stand-alone)

Series title EIFAC Occasional Paper

Series number 0258-6096 - EIFAC/OP21

Edition 1

Full item page

Synopsis (short abstract) This report presents a description and discussion of the different methods used in eel ageing studies during the last decade. Four main types of techniques are used: 1) grinding or slicing; 2) burning and cracking; 3) clearing of whole otoliths in alcohol; and 4) methods using advanced technology. Grinding and slicing is the most common with almost all institutes introducing their own modification of the general method. In very few cases has the validity of the method been documented. The availa ble evidence indicate that burning and cracking give a good approximation of true age. This method has proved to be accurate in a number of tests. Other method have proved useful in specific cases, but further studies are necessary.

Statutory body / Meeting title European Inland Fisheries and Aquaculture Advisory Commission (EIFAAC)

Cite this content as:

Vøllestad, L.A., R. Lecomte - Finiger, B. Steinmetz, Age determination of Anguilla anguilla (L.) and related species. EIFAC Occas. Pap., (21): pag. 1 – 28. Nielsen, J., Marking and tagging methods applied to eel, Anguilla anguilla (L.). EIFAC Occas. Pap., (21): pag. 1 – 24.

Language English

Related items

Showing items related by metadata.

Meeting

Workshop to further develop, test and apply a method for the estimation of tuna fishing capacity from stock assessment-related information 2008

Also available in:

No results found.
Book (series)

GFCM - Report of the Workshop on Standardization of Selectivity Methods Applied to Trawling in the / CGPM - Rapport de l’atelier sur la standardisation des méthodes de sélectivité appliquées au chalutage en 2007

Also available in:

No results found.

A General Fisheries Commission for the Mediterranean (GFCM) Workshop on Standardization of Selectivity Methods Applied to Trawling in the Mediterranean Sea has been organized by the French Research Institute for the Exploitation of the Sea (IFREMER) with the participation of FAO regional projects, COPEMED (Cooperation Networks to facilitate Coordination to Support Fisheries Management in the Western and Central Mediterranean) and ADRIAMED (Scientific Cooperation to Support Responsi ble Fisheries in the Adriatic Sea). The examination of different selectivity studies presented to the workshop showed the technical and practical difficulties in defining a single method to apply in the various situations encountered in the Mediterranean, but the need for using common rules to facilitate the exchange and the comparison of the results was underlined. Fish behaviour, survival after escapement and experimental reliability of statistical methods were discussed. The wor kshop acknowledged that square meshes are more selective than diamond meshes. It further stressed the need to investigate the selectivity impacts of square meshes on various species of different shapes (e.g. flatfishes) and to evaluate selectivity in economical terms. The workshop recommended the realization of a practical guide for selectivity studies in the Mediterranean and the establishment of a common selectivity database including both technical elements of the experimentatio ns and parameters of selectivity obtained. The need of establishing a network of fishing technologists including the fishing sector representatives was also expressed.
Project

Report of the Technical Workshop on Survey-based Abundance Estimation Methods and Application of Modern Methods of Stock Assessment and Total Allowable Catch (TAC) Determination for Sturgeon Fisheries in the Caspian Sea. Antalya, Turkey, 24–29 September 2009 / ????? ?? ??????????? ??????????? ??????? ?? ??????? ?????? ???????????, ?????????? ?? ??????? ?????? ? ?????????? ??????????? ??????? ?????? ??????? ? ??????????? ??? ??? ?????????? ??????????? ? ?????????? ????. ???????, ??????, 24-29 ???????? 2009 2009

Also available in:

No results found.

In response to a request from Azerbaijan, Islamic Republic of Iran, Kazakhstan, and Turkmenistan for assistance with building capacity in managing the sturgeon fisheries of the Caspian Sea, FAO developed a project entitled “Capacity building for the recovery and management of the sturgeon fisheries of the Caspian Sea” (TCP/INT/3101). At the FAO and the World Bank Planning Workshop in April 2008 where the four countries included in the project, plus the fifth Caspian range state the Rus sian Federation, participated it was agreed: “that a workshop should be held under the TCP Project with the following objectives: (i) identify, develop and test changes to the current stock assessment methodologies; and (ii) identify any support needed from development partners”. Such a workshop would further allow the countries to comply with a request from the Convention on International Trade in Endangered Species of Wild Fauna and Flora (CITES) Animals Committee. In response to the above recommendation, FAO and CITES organized the Technical Workshop on Stock Assessment and Total Allowable Catch (TAC) Methodologies in Rome from 11 to 13 November 2008. That Workshop was attended by four of the Caspian countries, while Islamic Republic of Iran unfortunately was unable to attend.

Users also downloaded

Showing related downloaded files

No results found.