The parasitic isopod Mothocya nana drives dietary shifts and poorer condition of Brazilian silversides Atherinella brasiliensis

Diseases of Aquatic Organisms
Joice Silva de SouzaAlejandra Filippo Gonzalez Neves Dos Santos

Abstract

Cymothoids are ectoparasites that may attach to various parts of the fish for molting and reproductive purposes, thus increasing the energetic costs of the host. This study investigated the influence of the parasitic isopod Mothocya nana on the physiological condition and diet of adult Brazilian silversides Atherinella brasiliensis at a sandy beach in southeastern Brazil. We collected 268 A. brasiliensis individuals, of which 230 fish were non-parasitized (mean ± SE total weight [TW] = 16.92 ± 0.38 g; total length [TL] = 127 ± 0.88 mm) and 38 were parasitized by up to 2 isopods (TW = 15.89 ± 0.79 g; TL = 126 ± 1.96 mm). Parasitic prevalence (P) and intensity (I) reached highest values in June 2015 (P = 20.88%; I = 1.31) and were slightly higher on males (P = 17.39%; I = 1.33) than on females (P = 13.07%; I = 1.27). Parasitized fish revealed poorer condition than non-parasitized ones, among which male hosts were especially burdened by M. nana's attachment. The condition factor, the eviscerated condition factor and the fullness index each showed a decreasing trend according to the parasite's development and offspring weight (i.e. increase in egg and larval weight). Parasitized and non-parasitized Brazilian silversides fed mainly ...Continue Reading

References

Oct 17, 2006·Ecology Letters·Melanie J HatcherAlison M Dunn
May 9, 2008·Ecology Letters·Kevin D LaffertyDavid W Thieltges
Nov 30, 2012·Biology Letters·Sandra A BinningCayne Layton
Sep 3, 2014·International Journal for Parasitology. Parasites and Wildlife·Nico J SmitKerry A Hadfield
Dec 3, 2016·Diseases of Aquatic Organisms·R KawanishiH Hata
Jul 27, 2017·Anais Da Academia Brasileira De Ciências·Jéssica E S A GolzioAna Carolina F Lacerda

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