The preliminary results of the JUVENA06 scientific campaign, undertaken by AZTI-Tecnalia over the months of September and October 2006 and financed jointly by the Basque Government's Department of Agriculture, Fisheries and Food and the Maritime Fisheries General Secretariat at the Spanish Ministry of Agriculture, Fisheries and Food, showed that the numbers of new-generation anchovies born last Spring have been insufficient for the recovery of the population. Consequently, anchovy fishing continues to be in a risk situation.
The scientific campaign, undertaken with two vessels, has enabled an evaluation of the entire Gulf of Biscay to be carried out and the presence of juvenile anchovies there to be determined even in shallow waters less than 50 metres deep where the greatest part of the anchovy population is to be found. The results of the evaluation campaign using sonar indicates an estimated abundance of juvenile anchovies between 30 and 50 % inferior to that estimated in 2005.
The JUVENA campaign was started with the aim of evaluating the abundance of juvenile anchovies in the Gulf of Biscay at the beginning of Autumn of each year and of establishing a relation between this index of abundance of juveniles and the abundance of one-year-old adults the following Spring.
To date, there are only three points of reference for the relation between a) the abundance of juvenile anchovies in the Autumn and b) recruitment of one-year-old adults in the following Spring: Autumn 2003-Spring 2004; Autumn 2004-Spring 2005, Autumn 2005-Spring 2006. Following on from this recent campaign carried out this Autumn and, once the Method of Daily Production of Eggs campaign was undertaken in the Spring of 2007 (BIOMAN 2007), an additional data reference will be available (Autumn 2006- Spring 2007).
The validity of the series relating the abundance of recruitment with the adult stock depends mainly on the range of the series and also, to a great extent, on the scope of the observations in the period studied. In this case, the series, apart from still being very short (given the fact that we only have three pairs of values), is restricted to medium-low values for the potential range of observations. Consequently, for the moment, the series only serves as a guideline.
A short history of the events over the last two years in relation to anchovy fishing is as follows:
Knowledge of the biology of this recourse reveals that its short life (maximum 3 years) its high death rate due both to natural causes and fishing - and the dependence of the adult biomass level on the abundance of new generations make the anchovy a highly vulnerable species and one which shows high fluctuations from one year to another, giving rise to deep crises in the sector. Suitable management of anchovy fishing based on scientific criteria is what all government administrations and the sector itself - have to be involved in order to guarantee the recovery of the anchovy stocks.
As a consequence, and based on this data:
1. The level of biomass estimated in this campaign undertaken by AZTI-Tecnalia indicates once again the need to protect stocks until the recovery of the resource has been verified as being above the precaution levels to assure a healthy reproductive stock capable of producing abundant generations.
2. Although the data from the JUVENA campaign are only valid as a guideline, they nevertheless confirm the current scientific advice for stock management provided by CIEM and ratified by the European Commission STECF, recommending the closure of fishing grounds until sufficient recruitment enables the recovery of the biomass of reproductive stock.
3. The need to maintain the closure of the anchovy fishing grounds until new scientific reports drawn up after the coming evaluation campaigns are undertaken inn the Spring of 2007 - indicate otherwise.
Last reviewed: By John M. Grohol, Psy.D. on 21 Feb 2009
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