Loading...
Study of perkinsosis in the carpet shell clam Tapes decussatus in Galicia (NW Spain). I. Identification of the aetiological agent and in vitro modulation of zoosporulation by temperature and salinity
Casas, SM Villalba, A Reece, Kimberly S
Casas, SM
Villalba, A
Reece, Kimberly S
Abstract
Morphological characters of zoosporulation stages and DNA sequence of the internal transcribed spacer (ITS) region and the small subunit ribosomal RNA (SSU rRNA) gene confirmed that the aetiological agent of perkinsosis in the clam Tapes decussatus from Galicia (NW Spain) was Perkinsus atlanticus Azevedo, 1989. In vitro modulation by temperature and salinity of the zoosporulation of the parasite was studied. The optimum temperature range for zoosporulation was 19 to 28degreesC. The temperature range allowing zoosporulation in vitro was 15 to 32degreesC, which is broader than previously reported (24 to 28degreesC) for R atlanticus, and strongly suggests that zoospores can be produced in Galician Rias, where temperature ranges from 10 to 22degreesC. Prezoosporangia held at 10degreesC for 2 mo (similar to winter conditions in Galician waters) gave rise to viable zoospores after they were transferred to higher temperatures. This suggests that prezoosporangia could overwinter and zoosporulate in the next spring. Zoospores could survive for up to 22 and 14 d at 28 and 10degreesC, respectively. The optimum salinity range for zooporulation was 25 to 35parts per thousand. Zoospore production was abruptly reduced as salinity decreased. The lowest salinity at which zoosporulation was observed was 10parts per thousand. The effectiveness of different chlorine concentrations and exposure lengths to kill prezoosporangia and zoospores was tested. No survival of free zoospores, free prezoosporangia and prezoosporangia included in gill tissue was observed after incubation for 1 h with 50, 200 and 3000 ppm of chlorine, respectively.
Description
Date
2002-06-01
Journal Title
Journal ISSN
Volume Title
Publisher
Collections
Download Dataset
Files
Loading...
casas2002.pdf
Adobe PDF, 697.82 KB
Rights Holder
Usage License
Embargo
Research Projects
Organizational Units
Journal Issue
Keywords
Aquatic Health Sciences Peer-Reviewed Articles
Citation
Advisor
Department
Virginia Institute of Marine Science
DOI
https://doi.org/10.3354/dao050051