Read e-book online The Biology of Crustacea. Pathobiology PDF


By Anthony Jr. Provenzano

ISBN-10: 0121064069

ISBN-13: 9780121064068

ISBN-10: 0323156355

ISBN-13: 9780323156356

The Biology of Crustacea

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B o n a m i (1976) briefly mentioned the simultaneous occurrence of two types of naked paraspherical viral particles, 31 a n d 2 4 n m , respectively, in a diseased s p e c i m e n of M. depurator. Purified virus inoculated into healthy animals reproduced the disease. 3. N U C L E A R VIRUSES O F P O R T U N I D C R A B S Four of the five nuclear viruses of crabs b e l o n g to the insect-infecting family, Baculoviridae. T h e y differ from the majority of k n o w n baculovirid species by being n o n o c c l u d e d .

This rickettsia w a s discovered in diseased crabs taken from the Sete region o n the Mediterranean coast of France. Rickettsiae were transmit­ ted to healthy crabs by inoculation of tissue suspensions from diseased crabs. Experimental infection c a u s e d death in 15 days. 1. Pathogens: Viral, Rickettsial, Bacterial, Fungal 29 III. THE BACTERIA A. Introduction W e k n o w essentially nothing a b o u t the importance of bacteria as disease producers in natural populations of crustaceans. K n o w l e d g e of the bacterial associations of terrestrial crustaceans is lacking a n d most information o n aquatic species c o n c e r n s captive a n d cultured shrimp, crayfish, crabs, and lobsters.

Virus is still present in s o m e of these animals, as inocula­ tion of their h e m o l y m p h into normal crabs c a n induce the disease. Increas­ ing the dilution of infectious h e m o l y m p h taken d u r i n g the first 2 days of patent infection increases the time before an injected crab s h o w s lack of clotting ability. In later infection, the situation is reversed, patent infection occurring first in crabs inoculated with highly diluted infectious h e m o ­ l y m p h , a n d later in those inoculated with more concentrated h e m o l y m p h .

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The Biology of Crustacea. Pathobiology by Anthony Jr. Provenzano

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