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Sex difference in liver-oil concentration in the deep-sea shark, Centroscymnus coelolepis
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Percentages of liver oil, squalene in oil and squalene in liver from fifty-seven individuals of Centroscymnus coelolepis, a deep-sea shark from the North African Atlantic Ocean near Tenerife (Canary Island), were measured. The percentages were in the range of 46.9–93.9 for liver oil, 35.5–62.2 for squalene in oil and 21.5–48.5 for squalene in liver. The liver-oil and squalene contents were related to the sex, maturity, size and catch depth of the sharks. Sex had a clear influence on the concentration of squalene levels found. Samples separated into two groups, according to their sex, when principal component analysis (PCA) was applied. Centroscymnus coelolepis males have greater economic value than females because they are easier to capture and have the highest squalene content.Resumen. Se han medido los porcentajes de aceite y escualeno contenidos en el hígado de 57 tiburones del género Centroscymnus coelolepis, capturados en aguas profundas del Océano Atlántico, cerca de Tenerife (Islas Canarias). Los porcentajes oscilaron entre 46.9 y 83.9 de aceite en hígado; 37.5 y 62.2 de escualeno en aceite y 21.5 y 48.5 de escualeno en hígado. Se ha relacionado el sexo, la madurez, tama�o y profundidad de pesca de los tiburones con el contenido en aceite y escualeno. Los resultados han mostrado que el sexo tiene una clara influencia en la proporción de este último. Cuando se aplicó el análisis de componentes principales (PCA), las muestras se separaron en dos grupos de acuerdo con su sexo.
Title: Sex difference in liver-oil concentration in the deep-sea shark, Centroscymnus coelolepis
Description:
Percentages of liver oil, squalene in oil and squalene in liver from fifty-seven individuals of Centroscymnus coelolepis, a deep-sea shark from the North African Atlantic Ocean near Tenerife (Canary Island), were measured.
The percentages were in the range of 46.
9–93.
9 for liver oil, 35.
5–62.
2 for squalene in oil and 21.
5–48.
5 for squalene in liver.
The liver-oil and squalene contents were related to the sex, maturity, size and catch depth of the sharks.
Sex had a clear influence on the concentration of squalene levels found.
Samples separated into two groups, according to their sex, when principal component analysis (PCA) was applied.
Centroscymnus coelolepis males have greater economic value than females because they are easier to capture and have the highest squalene content.
Resumen.
Se han medido los porcentajes de aceite y escualeno contenidos en el hígado de 57 tiburones del género Centroscymnus coelolepis, capturados en aguas profundas del Océano Atlántico, cerca de Tenerife (Islas Canarias).
Los porcentajes oscilaron entre 46.
9 y 83.
9 de aceite en hígado; 37.
5 y 62.
2 de escualeno en aceite y 21.
5 y 48.
5 de escualeno en hígado.
Se ha relacionado el sexo, la madurez, tama�o y profundidad de pesca de los tiburones con el contenido en aceite y escualeno.
Los resultados han mostrado que el sexo tiene una clara influencia en la proporción de este último.
Cuando se aplicó el análisis de componentes principales (PCA), las muestras se separaron en dos grupos de acuerdo con su sexo.
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