Cast Your Bread Upon The Waters

Two weeks ago we learned some interesting topics in the daf that touched on some raging controversies affecting kashrus today. One such Gemara was about the kashrus of sheratzim found in pits of water. This has relevance to the question of unfiltered New York City water, which contains tiny creatures named copepods. Copepods, eaten by themselves, are certainly not kosher. They are crustaceans just like crabs, lobsters, crayfish, shrimp, krill, and barnacles. However, there is an argument to permit them while they are in the water. This would be based on equating our reservoirs with the pits of water mentioned in the Gemara.
The Gemara says that aquatic creatures without fins and scales may be permitted if they were born in water pits. However, the pits mentioned in the Gemara are not flowing bodies of water. The water from one of the reservoirs that supply New York flows all the way from the Catskills to here!
Another interesting Gemara we studied last week discusses worms found in the flesh of fish. The Gemara issues a blanket statement that they are permitted. This would seem to indicate that the Anisakis worm should not present a kashrus problem. Anisakis is a parasitic worm commonly found in certain species of wild fish. In the times of the Gemara, one could eat fresh salmon or flounder without concern for the worms. However, some rabbanim argue that the situation today is markedly different.