Predatory fish of Hawaiian

Of pelagic fish in Hawaii

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Abstract

Globally, introductions of alien species are increasingly common, with invasive predators potentially having detrimental effects via predation on native species. However, native prey may avoid predation by adopting new behaviors. To determine whether invasive fish populations consume endemic shrimp in invaded Hawaiian anchialine habitats or if adopted patterns of diel migration prevents predation as previously hypothesized, a total of 183 invasive poeciliids (158 Gambusia affinis and 25 Poecilia reticulata) were collected for gut content analyses from four anchialine sites during wet and dry seasons on the islands of Hawai‘i and Maui. Predation on shrimp was not detected in habitats where they retreat exclusively into the underlying aquifer diurnally and only emerge nocturnally. However, low levels of predation were detected (7/65 fishes, only by Gambusia affinis) at Waianapanapa Cave, Maui, where shrimp retreat into both the aquifer and a cave during the day. Thus, adopted behavioral responses to invasive fishes generally, though not universally, prevent predation on endemic Hawaiian anchialine shrimps. However, non-consumptive effects resulting from behavioral modification of shrimps may have appreciable impacts on the Hawaiian anchialine ecosystem and warrant further study.


Impact of spear fishing on the abundance of large predatory coral reef fishes
Book (The University)

You never could eat more than a couple servings

2008-01-25 09:32:19 by iamlucky13

Predatory fish, being near the top of their food chain, naturally tend to accumulate mercury. The levels haven't changed, but our understanding of the risks has, hence the advisories to limit fish intake to a couple servings per week.
I'm not saying coal is all peachy and dandy, and I understand there is some significant mess from old, dirty coal plants in the NE, but it's not really as bad as most people make it out to be.


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