Open AccessTolerance of Juvenile Flatfish Paralichthys orbignyanus to Acid Stress
Author(s) -
Wasielesky Wilson,
Bianchini Adalto,
Santos Marcos H. S.,
Poersch Luis H.
Publication year - 1997
Publication title -
journal of the world aquaculture society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.655
H-Index - 60
eISSN - 1749-7345
pISSN - 0893-8849
DOI - 10.1111/j.1749-7345.1997.tb00857.x
Subject(s) - flatfish , biology , juvenile , paralichthys , salinity , zoology , photoperiodism , flounder , fishery , fish <actinopterygii> , ecology , botany
.— The tolerance of juvenile flatfish Paralichthys orbignyanus to acid stress, was studied in 30‐L plastic tanks using ten flatfishes (95 ± 13 g) per treatment. Water pH was monitored every 3 h and re‐adjusted to the test pH using either HCl or NaOH. The photoperiod was fixed at 12L:12D, water temperature at 23 ± 0.8 C, and salinity at 30 ppt. Fish survival and ventilatory rate were monitored daily. At pH 4.0, we observed 100% mortality and ventilation rates different from controls. At pH 5.2, there was 100% survival even after 96 h. However, ventilation rate was higher than in controls. At pH equal or higher than 6.0, we observed 100% survival and normal ventilation rates. The estimated pH which would kill 50% of test organisms were: 4.51, 4.50 and 4.40 after 48, 72, and 96 h of experiment, respectively. These results show that juvenile flatfish are relatively tolerant to acid stress.