Abstract
Induction of benzo (a) pyrene monooxygenase (BPMO) activity occurred in Blennius pavo, a species with a restricted territorial range, in response to exposure to a Diesel 2 oil. A response delay of 14 days was found at a concentration of 170 ppb and of 3 days when the water was saturated with Diesel 2 oil. When induced fish were transferred to clean water, elevated BPMO activity was maintained at a high level for at least a month. A benthic protochordate, Microcosmos sulcatus, showed no increase in BPMO activity when exposed to these concentrations even after 30 days of exposure. Field observations revealed a great variation in the BPMO activity from B. pavo caught at different sites. Fish from contaminated sites had significantly elevated levels of BPMO activity. Sardine schools caught at different sites had different, low levels of BPMO activities. However, specimens from the same school had closely similar levels of enzyme activity. An oil pollution incident (New Year 1977 oil spill in Northern Adriatic Sea) caused an increase in the BPMO activity in the livers of Blenniideae, reaching a peak on the 23rd day (representing an 8.5-fold increase in the background level), followed by a decrease in activity until a new background level, 3 times that of the original background level, was reached on the 45th day. This new background level is constant (through May-5 months after the incident). Measurement of BPMO activity in the livers of nonmigrant fish could serve as a useful biochemical parameter for monitoring and evaluation of acute or long-term oil pollution at a given site.
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Communicated by O. Kinne, Hamburg
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Kurelec, B., Britvić, S., Rijavec, M. et al. Benzo(a)pyrene monooxygenase induction in marine fish-molecular response to oil pollution. Marine Biology 44, 211–216 (1977). https://doi.org/10.1007/BF00387701
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DOI: https://doi.org/10.1007/BF00387701