4 research outputs found
Assessing the performance of statistical classifiers to discriminate fish stocks using Fourier analysis of otolith shape
The assignment of individual fish to its stock of origin is important for reliable stock assessment and fisheries management. Otolith shape is commonly used as the marker of distinct stocks in discrimination studies. Our literature review showed that the application and comparison of alternative statistical classifiers to discriminate fish stocks based on otolith shape is limited. Therefore, we compared the performance of two traditional and four machine learning classifiers based on Fourier analysis of otolith shape using selected stocks of Atlantic cod (Gadus morhua) in the southern Baltic and Atlantic herring (Clupea harengus) in the western Norwegian Sea, Skagerrak and the southern Baltic Sea. Our results showed that the stocks can be successfully discriminated based on their otolith shapes. We observed significant differences in the accuracy obtained by the tested classifiers. For both species, support vector machines (SVM) resulted in the highest classification accuracy. These findings suggest that modern machine learning algorithms, like SVM, can help to improve the accuracy of fish stock discrimination systems based on the otolith shape.Assessing the performance of statistical classifiers to discriminate fish stocks using Fourier analysis of otolith shapesubmittedVersio
Otoliths identifiers using image contours EFD
Abstract. In this paper we analyze the characteristics of an experimental otolith
identification system based on image contours described with Elliptical Fourier
Descriptors (EFD). Otoliths are found in the inner ear of fishes. They are formed
by calcium carbonate crystals and organic materials of proteic origin. Fish otolith
shape analysis can be used for sex, age, population and species identification studies,
and can provide necessary and relevant information for ecological studies. The
system we propose has been tested for the identification of three different species,
Engraulis encrasicholus, Pomadasys incisus belonging to the different families
(Engroulidae and Haemolidae), and two populations of the species Merluccius
merluccius (from CAT and GAL) from the family Merlucciidae. The identification
of species from different families could be carried out quite easily with some
simple class identifiers -i.e based on Support Vector Machine (SVM) with linear
Kernel-; however, to identify these two populations that are characterized by a
high similarity in their global form; a more accurate, and detailed shape representation
of the otoliths are required, and at the same time the Otolith identifiers have
to deal with a bigger number of descriptors. That is the principal reason that
makes a challenging task both the design and the training of an otolith identification
system, with a good performance on both cases
Otoliths identifiers using image contours EFD
In this paper we analyze the characteristics of an experimental otolith
identification system based on image contours described with Elliptical Fourier
Descriptors (EFD). Otoliths are found in the inner ear of fishes. They are formed
by calcium carbonate crystals and organic materials of proteic origin. Fish otolith
shape analysis can be used for sex, age, population and species identification studies,
and can provide necessary and relevant information for ecological studies. The
system we propose has been tested for the identification of three different species,
Engraulis encrasicholus, Pomadasys incisus belonging to the different families
(Engroulidae and Haemolidae), and two populations of the species Merluccius
merluccius (from CAT and GAL) from the family Merlucciidae. The identification
of species from different families could be carried out quite easily with some
simple class identifiers -i.e based on Support Vector Machine (SVM) with linear
Kernel-; however, to identify these two populations that are characterized by a
high similarity in their global form; a more accurate, and detailed shape representation
of the otoliths are required, and at the same time the Otolith identifiers have
to deal with a bigger number of descriptors. That is the principal reason that
makes a challenging task both the design and the training of an otolith identification
system, with a good performance on both cases.Peer Reviewe