Anchovy egg development in the Gulf of Cádiz and its comparison with development rates in the Bay of Biscay
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Daily egg production method
Gulf of Cádiz
Multinomial models were used to analyse anchovy (Engraulis encrasicholus, L.) egg development in the Gulf of Cádiz and provide the required egg development model for the application of the daily egg production method in this area. Also, models were modified to allow for a statistical comparison between the egg development in the Gulf of Cádiz and in the Bay of Biscay. The Gulf of Cádiz data was obtained from an incubation experiment carried out during July2007, where wild adults were collected, an in vitro fecundation was immediately performed and viable eggs were maintained in an on-land incubator at five different controlled temperatures (approximately 10, 14, 18, 22 and 26 ºC). Eggs were sampled hourly and classified into stages until they developed into larvae. The model of the combined data from the Gulf of Cádiz and the Bay of Biscay show no differences between areas, suggesting that for the same temperatures, the total duration of the egg phase is similar for the Gulf of Cádiz and ...
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