Open AccessStudies on the Lethal Dissolved Oxygen Levels for Young Brown Shrimp, Penaeus Aztecus Ives
Author(s) -
Kramer Gary L.
Publication year - 1975
Publication title -
proceedings of the annual meeting ‐ world mariculture society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.655
H-Index - 60
eISSN - 1749-7345
pISSN - 0164-0399
DOI - 10.1111/j.1749-7345.1975.tb00014.x
Subject(s) - salinity , shrimp , penaeus , acclimatization , oxygen , biology , decapoda , zoology , ecology , crustacean , fishery , chemistry , organic chemistry
The effects of sudden salinity changes and rates of reduction in dissolved oxygen content on the lethal dissolved oxygen levels for brown shrimp (Penaeus aztecus) juveniles (51 mm mean length) and subadults (91 mm mean length) were determined by direct transfer from an acclimation salinity of 10 ppt to test salinities of 2.5, 5, 10, and 36 ppt at rates of reduction in dissolved oxygen content of 0.7, 1.4, and 2.6 ppm/hr. Behavioral responses to these environmental changes were observed and the relations of size and sex to lethal levels of dissolved oxygen were analyzed. The lethal dissolved oxygen concentrations for juveniles appear to be affected by sudden salinity changes, while those for subadults remain the same. In the acclimation salinity, subadults died over wider ranges and at higher mean oxygen levels than juveniles. Sex does not appear to significantly modify the lethal dissolved oxygen concentrations for either of these stages of the shrimp life cycle. Behavioral responses indicate that young brown shrimp can detect and therefore possibly avoid low levels of dissolved oxygen. Close monitoring of pond dissolved oxygen and maintenance above 2.0 ppm appears essential to good shrimp husbandry.