Bibliographic citations
Cueto, R., (2016). Influencia de las variables ambientales sobre el índice gonado-somático de la concha de abanico Argopecten purpuratus (L, 1819) en la Bahía de Paracas, Pisco [Tesis, Universidad Nacional Agraria La Molina]. https://hdl.handle.net/20.500.12996/2231
Cueto, R., Influencia de las variables ambientales sobre el índice gonado-somático de la concha de abanico Argopecten purpuratus (L, 1819) en la Bahía de Paracas, Pisco [Tesis]. : Universidad Nacional Agraria La Molina; 2016. https://hdl.handle.net/20.500.12996/2231
@misc{renati/1116701,
title = "Influencia de las variables ambientales sobre el índice gonado-somático de la concha de abanico Argopecten purpuratus (L, 1819) en la Bahía de Paracas, Pisco",
author = "Cueto Vega, Rosa",
publisher = "Universidad Nacional Agraria La Molina",
year = "2016"
}
Peruvian scallop Argopecten purpuratus is the most important marine resource for aquaculture in Peru. Its harvest time is determinate when individuals get higher performance in adductor muscle and gonad weight, in other words when their gonad is ripe. However, this stage could finish in less than a week until the spawning time, when there is lower weight and bad gonad appearance. This is an uncertainty period for the fish farmers and sometimes it produce economic losses to them. The aim of this study is to identify environmental variables that explain the variation in gonadosomatic index (GSI) of this specie in order to improve the harvesting and commercialization process of this resource. From August 2012 to March 2013 a monitoring was performed at two depths (bottom and in suspended culture at two meters above the bottom) in aquaculture area in Paracas Bay, Peru. We placed two batches of A. purpuratus, differing in its size, in pearl nets and we installed them in each depth. Every week, 30 individuals of each size/depth were sampled, measured (mm, shell height) and weighted (gr, tissue weight), then the GSI was calculated. During the experimental period, biotic and abiotic environmental variables were recorded at high temporal resolution, which we proposed two models for bottom and suspended culture respectively. The most significant variables (P < 0.05) for the GSI was hypoxia (in both), oxygen saturation (suspended culture), and velocity of currents (bottom culture), turbidity (bottom culture) and lunar phase suspended culture. Besides, at the end of winter and spring, we detected a cyclic variation of GSI influenced by lunar cycles (P < 0.05), thus spawning events occurred, on average, about a week after the new moon. Nonetheless, during the summer, the progressive hypoxia event and the lower salinity produced a diminution in gonad weight and in the mean of GSI. Results of this study evidenced that over the months of August to December is better to harvest this specie during or a week before the new moon to avoid the gonadal weight fall in commercialized scallops.
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