Accession Number : AD0287154

Title :   ECOLOGICAL STUDIES OF THE LARVAL DEVELOPMENT OF RHITHROPANOPEUS HARRISII (XANTHIDAE, BRACHYURA)

Corporate Author : JOHNS HOPKINS UNIV BALTIMORE MD CHESAPEAKE BAY INST

Personal Author(s) : CHAMBERLAIN,N.A.

Report Date : AUG 1962

Pagination or Media Count : 1

Abstract : The larvae of Rhithropanopeus harrisii were successfully reared in isolation in the laboratory using copepod nauplii as the sole food source. Laboratory cultures fed this and other diets were used to xamine environmental effects on the development and mortality of the larvae. Every individual successfully completing larval development went through 4 zoeal stages and one megalopa before metamorphosis to the first crab stage. Larvae exposed to both algae and nauplii developed much more slowly than those exposed to nauplii alone. Cultures maintained at 1 and 15% salinity were not successful, those at 3% salinity had high mortality, and those at 6% and 10% salinity were most successful with mortalities of 0 to 20%. Development at 30 C was found to be about twice as rapid as at 15 C at salinities where mortality was low. The results of these experiments were used in the design of a study of a natural population. A recently described tracer technique using the dye rhodamine B and highly sensitive fluorometers was employed in the estimation of exchange of water between a small embayment containing a natural population of Rhithropanopeus harrisii and outside areas in Chesapeake Bay. (Author)

Descriptors :   *CRUSTACEA, ALGAE, CULTURE MEDIA, ECOLOGY, FLUOROMETERS, GROWTH(PHYSIOLOGY), REARING, SALINITY

Distribution Statement : APPROVED FOR PUBLIC RELEASE