from The American Heritage® Dictionary of the English Language, 4th Edition
- n. The portion of a fishing catch that is discarded as unwanted or commercially unusable.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. Alternative spelling of bycatch.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. unwanted marine creatures that are caught in the nets while fishing for another species
Sorry, no etymologies found.
While sharks are often caught accidentally called by-catch, a global market exists for shark fins, the main ingredient in shark fin soup.
Many sharks, rays and marine mammals are caught as by-catch of driftnet and longline fishing.
But once you start fishing deep you've got by-catch.
The Troll trap only ever caught by-catch, not the intended target.
Crashing populations, horrible pollution problems, by-catch that you would not believe – millions and millions of tons every year thrown over the side.
Here's just one example: for the South Georgia Patagonian Toothfish fishery, stringent requirements include an independent observer on board every vessel on every trip to record catch data and fishery interactions with seabirds and a range of measures taken during the course of the involvement with the MSC program to reduce seabird by-catch has reduced albatross mortality from several thousand annually to single figures.
Bottom trawling (scraping large nets across the seabed) kills coral, stirs up sediment causing pollutants to migrate into seaweed and other fish feed, and scoops up large amounts of by-catch -- other sealife, like turtles and dolphins unintentionally caught and wasted.
Current threats include changes in land-and water-use, human exploitation of resources upon which the animals depend, direct cropping of the animals for food or sport, accidental killing (as in the by-catch resulting from other fisheries), or pollution.
The WWF estimates that 90% of non-natural whale deaths are due to collisions with ships, followed by "by-catch," whales becoming caught in nets, and then lastly, by fishing.
The long line and nylon gill nets widely employed by the fishermen create unintended by-catch of sea turtles.