Medium-high recruitment forecast for Bay of Biscay anchovy
2016-12-02 17:55:06   copyfrom:    hits:

Research work carried out onboard one of the vessels participating in Juvena 2016 survey (Photo: AZTI)SPAINFriday,
 

Research work carried out onboard one of the vessels participating in Juvena 2016 survey. (Photo: AZTI)

 

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Friday, December 02, 2016, 00:30 (GMT + 9)

 

The data obtained during September in the scientific survey Juvena 2016 make it possible to estimate a juvenile anchovy biomass of about 370,000 tonnes in waters of the Bay of Biscay. This estimate is the fourth largest in the time series started in 2003, which predicts a high or medium-high recruitment for next year.

The information was analyzed by a team of AZTI researchers who travelled aboard the oceanographic vessels Emma Bardan and Ramon Margalef, belonging to the fleets of the General Secretariat of Fisheries and theSpanish Institute of Oceanography (IEO), respectively.

Juvena 2016 survey aims to determine the abundance and spatial distribution of juvenile anchovies, study their status and analyze the environmental factors that affect their survival, all aimed at predicting the amount of biomass that will reach adulthood next year.

The data analysis of this survey, financed by the Basque Government, theMinistry of Agriculture and Fisheries, Food and Environment and the IEO, makes it possible to make recommendations to fishing authorities on the risks associated with the authorized anchovy catches and in case the data so advise, open or close the fishery and recommend the TAC for the coming season.

Through ultrasound emission, which reach up to 400 metres depth, it has been determined by the echo obtained both the estimated juvenile anchovy biomass (about 370,000 tonnes) and its location (mostly outside the continental shelf).

At the same time, fishing activities done during the tour allowed for the determination of the average size of the juveniles in about 7 centimetres. This estimate anticipates a high or medium-high recruitment, which implies a favourable scenario facing the coastal anchovy capture of 2017.

In addition to assessing the juvenile anchovy abundance, the AZTI survey collects data from the marine ecosystem as a whole to understand the processes that affect it.

In particular, in recent years AZTI researchers have evaluated the spatial distribution of large marine predators in the Bay of Biscay. For this, they have analyzed the distribution and abundance of birds and marine mammals, collecting information on the species present, the number and behaviour of the specimens sighted during the tour.

 

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