Aspectos reproductivos del erizo verde Loxechinus albus (Molina, 1782) de la Región Arequipa, 2017-2018

Angela Incio; Stevens Lucero; Edward Barriga Rivera

Authors

Angela Incio Instituto del Mar del Perú. Laboratorio Costero de Camaná
Stevens Lucero Instituto del Mar del Perú. Laboratorio Costero de Camaná
Edward Barriga Rivera Instituto del Mar del Perú. Laboratorio Costero de Camaná

Keywords:

Loxechinus albus, sea urchin, reproductive indexes, temperature

Abstract

This research aimed to determine the monthly gonadal condition, sex ratio, and breeding rates of the green sea urchin Loxechinus albus, which is an endemic species of the Peruvian and Chilean coasts and is one of the most commercially important marine invertebrates. The study was carried out between 2017-2018 in the coast of the Arequipa Region to determine its breeding pattern, based on the histological analysis, by means of the paraffin infiltration method, of 1092 samples from natural banks in the Islay province over 14 months. The sex ratio was 0.8 M: 1 F. The gonadal condition showed a higher ratio of maturing organisms (II) in May and July, mature (III) from July to October, spawning/expelling (IV) mainly in September and October, and in recovery/rest (V) from March to May, no virgin individuals were identified (I). The gonadosomatic index (GSI) showed the highest value in July (12.4%). The reproductive activity index (RAI) and spawning activity index (SAI) showed a similar pattern; the RAI of the females had high values in September and October when there was a greater presence of specimens with high gonadal development. The SAI showed its highest value in October (48% in females and 71.4% in males) and spring was the main breeding season, which coincides with what has been described by other authors and has a direct relationship with the lower temperature.

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