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International Journal of Zoological Research
  Year: 2006 | Volume: 2 | Issue: 1 | Page No.: 91-99
DOI: 10.3923/ijzr.2006.91.99
First Record on Larval Development of the Cirripedian Parasite Loxothylacus texanus (Cirripedia-Rhizocephala) Under Laboratory Conditions in México
H. Vazquez-Lopez , F. Alvarez-Noguera and J. Franco-Lopez

Abstract:
Crabs with mature parasites were put on individual aquariums of 20 L of capacity and with an initial salinity of 10‰. Salinity was gradually increased 1‰ until it reached a point in which parasites expeled their eggs or larvae. Larvae at different developmental stages obtained from each sample were preserved in 70 and ethanol to be studied afterwards. From 20 crabs employed, only 14 of them produced eggs and other 6 died after a few days at the aquariums. The mature externas expelled from 8000 to 160000 clustered eggs. After 24 h from the beginning of cellular division, larvae hatch. This larvae are called nauplius 1. This stage lasted 24 h, after which all larvae entered an excitation period, where they rapidly moved, to then pass a new molt process resulting in a new larval stage, nauplius 2. Elevating salinity a unity, externas started to expel eggs, nauplis larvae 1 hatched from them, but they only survived less than 24 h. As salinity increased, nauplius larvae lived longer, even to realized a molt. At a 15‰ salinity, larvae reached cypris stage with no problem, but with a salinity higher than 25‰, larvae died after a few hours of hatching. We can conclude that: the rhizocephalan Loxothylacus texanus has two nauplius stages, the nauplius and cypris larvae presented similar morphological characteristics to related species of rhizocephalans and a salinity interval from 15 to 20‰ report the same result.
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 RELATED ARTICLES:
  •    Shell Disease in Callinectes rathbunae Contreras, 1930, Parasitized by Loxothylacus texanus Boschma, 1933
How to cite this article:

H. Vazquez-Lopez , F. Alvarez-Noguera and J. Franco-Lopez , 2006. First Record on Larval Development of the Cirripedian Parasite Loxothylacus texanus (Cirripedia-Rhizocephala) Under Laboratory Conditions in México. International Journal of Zoological Research, 2: 91-99.

DOI: 10.3923/ijzr.2006.91.99

URL: https://scialert.net/abstract/?doi=ijzr.2006.91.99

 
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