May 24, 2022


University of Huelva develops system that counts quantity and size of aquaculture fish



Experts from the University of Huelva, Spain, have developed a non-invasive system that accurately estimates the quantity and size of aquaculture sea bream fish, Fish Information & Services reported.

The non-invasive system does not interfere with the specimen's environment, so it does not cause stress or add to their mortality.


The experts used a device called a called static multibeam sonar, used in sport and commercial fishing that. The device identifies the presence of a fish and captures images similar to ultrasound, then the information is transferred to a software to calculate the number, size, weight and length of the fish based on their aggregation behavior  or movement.


Juan Carlos Gutiérrez Estrada, a researcher from the University of Huelva, said previous methods to calculate the number of specimens in fish farms may be harmful to the fish, as the pond needs to be partially emptied so operators can take a sample, measure and weigh them.


In the university's study published in Aquacultural Engineering, they worked with specimens of sea bream (Sparus aurata) raised in estuaries of the Salinas del Astur, located in the Huelva town of Punta Umbría. The sea bream grows from a weight of 30 to 100 g to commercial weights in these ponds,, which are around 400 g.


The researchers employed a static sonar with precise spatial boundaries of up to six metres to properly determine the number of specimens in a culture pond, as well as their weight and size. The presence of fish in this range causes interference, which is generally caught as dots in the photos.


-      Fish Information & Services

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