Open AccessEFFECTS OF WATER‐BORNE MIREX ON THE SURVIVAL AND PRODUCTION OF Macrobrachium rosenbergii (DE MAN) 1
Author(s) -
Summer S. E.,
Eversole A. G.
Publication year - 1978
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.1749-7345.1978.tb00230.x
Subject(s) - macrobrachium rosenbergii , liter , zoology , biology , prawn , toxicology , larva , fishery , ecology , endocrinology
Post‐larval Macrobrachium rosenbergii (11–30 nun total length) were exposed to mirex in water for 24 and 96 hours under static laboratory conditions. A LC 50 value of 104 μg/liter was determined by probit analysis for prawns exposed for 24 hours, transferred to uncontaminated water, and observed for 72 hours. Prawns exposed for 96 hours at lower concentrations (100, 10, 1, and 0.1 μg/liter) had higher survival with the greatest mortality occurring at 100 μg/liter. One hundred prawns were individually exposed to 100, 10, 1, and 0.1 μg/liter for 96 hours, transferred to uncontaminated water and observed for an additional 24 days. No significant difference was found in number of molts, percent gain in length and weight, feeding or activity among concentrations (including control). However, those prawns exposed to the highest concentration molted fewer times. Also, a greater number of molt failures were observed with treatment animals, most occurring during the exposure period. The molt interval increased linearly with mirex concentration. Prawns in the control had significantly (P<0.05) shorter molt intervals than prawns exposed to 10 and 100 pg/liter. Consequently a loss in potential production (wet weight) over 28 days would be expected and the calculated percent gain in the control was 1.70 and 2.24 times that of the 10 and 100 μg/liter treatments.