Please use this identifier to cite or link to this item: http://hdl.handle.net/10553/37207
Title: Ovarian maturity, egg development, and offspring generation of the deep-water shrimp Plesionika edwardsii (Decapoda, Pandalidae) from three isolated populations in the eastern North Atlantic
Authors: Triay-Portella, Raül 
Ruiz Díaz, Raquel
Pajuelo, Jose G. 
González Pérez, José Antonio 
UNESCO Clasification: 2401 Biología animal (zoología)
251092 Acuicultura marina
Keywords: Brood size
Central–eastern Atlantic
Maturity scale
Ovarian and embryo development
Pandalidae, et al
Issue Date: 2017
Journal: Marine Biology Research 
Abstract: Ovarian maturity, egg development and brood size were analysed for three isolated populations (Madeira, the Canary Islands and Cape Verde Islands) of Plesionika edwardsii (Decapoda, Pandalidae) in the eastern Atlantic. Multiple colour patterns were observed at the same ovarian maturity stage, which was verified histologically, invalidating the extensive use of ovarian colour as a maturity stage criterion. The physiological size at sexual maturity, based on the maturity of the ovaries, was higher in Madeira (carapace length of 19.73 mm) and decreased to the Cape Verdes (16.39 mm). Synchronic ovarian maturation was observed during the embryo incubation process, and ovigerous females bearing embryos at the final stage of development were found throughout the year. Females are multiple spawners during the reproductive season, after which the reproductive process ends and a rest period begins. The absence of females larger than the size at sexual maturity with ovaries in Stage 1, the incubation of embryos in the final developmental stages, suggests that the resting period begins with a process that reabsorbs the energy located in the ovaries and that the resting period occurs asynchronously in females in each of the studied populations. Embryo size was independent of female body size in the three populations studied, but increased with the developmental stage. A power equation was used to describe the relationship between brood size and female body size in the three areas studied. The mean number of external Stage I embryos carried by females decreased from Madeira (n = 7868) to the Cape Verdes (n = 3781), where less energy, in terms of the number of embryos and the size of the eggs, was invested in reproduction. Although female size decreases from north to south, the egg number was higher in Madeira than in the Cape Verdes for the same size range.
URI: http://hdl.handle.net/10553/37207
ISSN: 1745-1000
DOI: 10.1080/17451000.2016.1239018
Source: Marine Biology Research[ISSN 1745-1000],v. 13, p. 174-187
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