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Fecundity and effects of bopyrid infestation on egg production in the Caribbean sponge-dwelling snapping shrimp Synalpheus yano (Decapoda: Alpheidae)

Published online by Cambridge University Press:  03 November 2009

Patricio Hernáez
Affiliation:
Unidad de Investigación Pesquera y Acuicultura (UNIP), Centro de Investigaciones en Ciencias del Mar y Limnología, Universidad de Costa Rica (CIMAR) Museo del Mar, Universidad Arturo Prat, Casilla 121, Iquique, Chile
Betel Martínez-Guerrero
Affiliation:
Laboratorio de Sistemática de Invertebrados Marinos (LABSIM), Universidad del Mar, Campus Puerto Ángel, Puerto Ángel, Oaxaca CP 70902, México
Arthur Anker
Affiliation:
Dickinson Hall, Florida Museum of Natural History, University of Florida, Gainesville, FL 32611-7800, USA
Ingo S. Wehrtmann*
Affiliation:
Unidad de Investigación Pesquera y Acuicultura (UNIP), Centro de Investigaciones en Ciencias del Mar y Limnología, Universidad de Costa Rica (CIMAR) Escuela de Biología, Universidad de Costa Rica, 2060 San José, Costa Rica
*
Correspondence should be addressed to: Ingo S. Wehrtmann, Escuela de Biología, Universidad de Costa Rica, 2060 San José, Costa Rica email: ingowehrtmann@gmx.de

Abstract

Several Synalpheus species have been reported as hosts of bopyrid parasites; however, the impact of infestation on egg production is still unknown. Therefore, the present work studied reproductive aspects and the effect of parasitism on fecundity of the alpheid shrimp Synalpheus yano from Bocas del Toro, Caribbean coast of Panama. Un-infested females (N = 84) ranging from 3.7 to 9.6 mm carapace length, produced between 5 and 246 eggs (average: 98±64.6), and egg number increased significantly with female size. The eggs were relatively large (0.6–1.3 mm in diameter), but within the range of other Synalpheus species, and egg size did not differ significantly between un-infested and infested females. Despite these large eggs, the morphological characteristics of hatching larvae indicate a planktotrophic development. During the incubation period, the egg volume increased from 0.100 to 0.218 mm3, representing an overall increase of 118%. A total of 18 females (16% of all ovigerous individuals) were infested, and the occurrence of parasitic infestation was more pronounced in larger females. Infested females ranging from 4.6 to 9.4 mm carapace length, produced between 22 and 166 eggs (average: 81±44.4). Egg-bearing females infested by parasitic bopyrids carried on average 41% fewer eggs than similar-sized females without parasites. The co-occurrence of parasites and developing eggs, however, indicates that the bopyrid parasite does not necessarily castrate its host. Therefore, we encourage more comparative intraspecific studies on egg production in infested and un-infested females to assess the impact of infestation on fecundity in caridean shrimp.

Type
Research Article
Copyright
Copyright © Marine Biological Association of the United Kingdom 2009

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