WHAT FISH AGE CAN TELL US?



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WHAT FISH AGE CAN TELL US?

WORKING CONCEPTS

The determination of fish age is one of the most relevant parameter for the study of fish population dynamics. It is the bases to do the calculations and know the growth, mortality, recruitment and other fundamental parameters of fish populations. From reading the fish age from squamas, this workshop introduces the student to the main concepts of population ecology and its application in conservation and management.

WORKSHOP DESCRIPTION

Interactive workshop where the students have to read the age of a fish by using the squamas and, from this information, answer different questions about population characteristics of the fish origin population.

First a theoretical presentation is performed about how to determine the fish age from skeleton structures such as squamas and otholites. It is demonstrated how to obtain these structures, which shapes can they present, and how we perform the age reading.

The, the students visualize different samples of the two structures already prepared under the estereomicroscope or a squama lector. The students compare the readings and determine the fish age. In the workshop they see different types of squamas and the drawbacks of the method, such as the finding of regenerating squamas that do not allow the reading.

The last step consists on, by means of a simulation program, determine the survival curve and the age structure of the population and their use in management and conservation of species.

– Ecology and conservation of continental fish in rivers, lakes, reservoirs and humid areas.

– Biological invasions in continental waters: paths and introductory vectors, life cycles and biological impacts.

– Freshwater organisms as biological indicators: algae, invertebrates, fish.

– Conservation and management of aquatic ecosystems.

– Statistical ecology.

Research groups at the UdG: “Grup de recerca en biologia animal: ictiología”, “Grup de recerca en biologia animal: ictiologia.”


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