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The collection of anchovy roe is carried out in 468 sampling stations

IFOP: Cruises for the evaluation of the spawning stock of anchovy in the Atacama and Coquimbo regions, year 2020

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Wednesday, September 16, 2020, 02:00 (GMT + 9)

The Daily Egg Production Method has been applied in the Atacama and Coquimbo Regions between 2015 and 2020. Along with being a piece of information for the annual assessment of the anchovy stock, it allows studying the temporal and spatial variations of the reproductive parameters . In addition, the study of the environment makes it possible to evaluate exogenous factors, such as the quality of the available food and the conditions of the environment in which the resource spawns.
 
During the season of maximum reproductive activity of anchovy (Engraulis ringens), IFOP executes cruises in the Atacama and Coquimbo Regions to carry out the annual evaluation of the spawning stock of this resource.
 
 
This evaluation determines the spawning biomass of anchovy, using the statistical analysis of the Daily Egg Production Method (MPDH), which considers the estimation of reproductive parameters of anchovy that, when related to the abundance and coverage of eggs released into the environment, provides the Spawning biomass as the fraction of fish capable of spawning during the peak spawning period. For this, an intensive sampling of anchovy roe and adults must be carried out. Therefore, between August 31 and September 30, 2020, various ships will be found collecting information on the reproductive status of the anchovy and the environmental condition of the area.
 
The collection of anchovy roe is carried out in 468 sampling stations using the Doña Adriana ship in 21 days of operation, while the oceanographic sampling is carried out in 11 days of operation in the Garota III boat, completing 50 stations (temperature, salinity, dissolved oxygen, chlorophyll-a and plankton) to determine the environmental condition of the time of maximum reproductive activity. In these two ships the sampling is carried out by IFOP's Department of Oceanography and Environment (DOMA) staff.
 
On the other hand, the sampling of adult anchovy, with 24 days of total operation, is carried out in the Garota V and Santa Norma warehouses in the Coquimbo Region; and the Don Atilio ship in the Atacama region. Sampling of adults is carried out by specialized IFOP staff in each Region. The project leader is the Oceanographer Úrsula Cifuentes, a DOMA researcher.
 
 


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