Abstract
Light microscope observations were made of the developmental morphology, life cycle, and host range of a strain of Haliphthoros milfordensis Vishniac isolated from the pink shrimp, Penaeus duorarum. Zoospores of the isolate, by virtue of their variation in shape and subapically attached flagella, are not as described previously for this genus. However, they are biflagellate and therefore characteristically oomycetous. Encystment of spores begins with flagellar retraction and rounding-up and terminates with the formation of an external, spined cyst wall. Germination is monopolar, producing germ tubes of various dimensions which fan out into hyphae. Vegetative growth is accompanied by multibranching at right angles and fragmentation. Sporogenesis is holocarpic but unusual in that thallus conversion into spores occurs in delimited segments non-simultaneously and in that spore cleavage is sequential, beginning in the sporangium and ending in the discharge tube. Infectivity tests indicate that H. milfordensis is a facultative parasite occurring on several crustacean hosts: however, the site of infection varies according to host structure.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
