Thus, the strategy we adopted for this 4-year field study to detect human health effects of recurring occupational exposure to an organism that may or may not actually make a toxin (that may or may not affect humans), and that may or may not cause fish kills and fish lesions, was to simply monitor for the organism itself, with an assay proven to be able to detect "toxic" strains.
Do not use tongs since they may cause the fish to break apart.
Always remove stray algae floating around the tank as it may cause the fish tank to be cloudy.
Both effects, in fact, may have complemented each other; heavy fishing pressure may have caused fish stocks to become more susceptible to environmental shifts.
Murky water may be causing fish extinctions in Africa's Lake Victoria by making it impossible for female fish to recognize and mate with the brightly colored males.
You may double the equipments for your fish tank design so as to avoid downtime that can cause fish fatality.
When the conditions are right, the polyps switch into jellyfish-production mode and bud off massive numbers of baby jellyfish.Overfishing may cause blooms: some fish eat baby jellyfish, and some, like herring, compete with jellyfish for the same zooplankton food.
At high concentrations, K. brevis blooms may cause mortality of fish, marine mammals, and sea birds.
Previous research suggests that fishing may cause changes to a suite of fish population-level attributes (e.g., survival and recruitment) as well as various interrelated phenotypic expressions at the individual level (e.g., growth, and size and age at maturation; Stokes et al. 1993; Law 2000; Walsh et al. 2006).
Rapid dewatering in rivers as a consequence of hydropower operations may cause stranding of juvenile fish and have a negative impact on fish populations.
