systematic shifts in species distribution

Tag Archives: systematic shifts in species distribution

Why was this NOT used in the Surprise Gulf of Maine Cod Assessment?

December 12, 2014 Mid Atlantic, New England

Most models of fish population dynamics are based on fisheries-independent surveys, fixed over a particular area during a specific season, and rarely cover the entire range of habitat that fish use. Many fish are highly mobile ectotherms – an animal that cannot regulate its own body temperature, so its body temperature fluctuates according to its surroundings. They often shift their distributions in response to dynamic properties of the ocean such as changing water temperature. When surveys do not sample the entire range of habitat fish use, systematic shifts in species distribution into, or out of, survey areas can be misinterpreted as increases or decreases in population size. Read the rest here 14:25

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The New England groundfish debacle (Part III): who or what is at fault? Nils E. Stolpe/FishNet

It took me a while to decide how to most accurately describe the situation that has been visited upon the New England fishing communities that are and since colonial times have been dependent on the groundfish fisheries.

NILS STOLPE: The New England groundfish debacle (Part IV): Is cutting back harvest really the answer?

While it’s a fact that’s hardly ever acknowledged, the assumption in fisheries management is that if the population of a stock of fish isn’t at some arbitrary level, it’s because of too much fishing. Hence the term “overfished.” Hence the mandated knee jerk reaction of the fisheries managers to not enough fish; cut back on fishing. What of other factors? They don’t count. It’s all about fishing, because fishing is all that the managers can control; it’s their Maslow’s Hammer. When it comes to the oceans it seems as if it’s about all that the industry connected mega-foundations that support the anti-fishing ENGOs with hundreds of millions of dollars a year in “donations” are interested in controlling. Read the article here

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