Pelagic fish Great Lakes

Day 7 – Hello from East Tawas, Michigan. Our survey of Lake Huron is well underway! The R/V Sturgeon and her crew have been working the last several nights and we have begun to make our journey south in Lake Huron. So far we have traveled around 500 miles and sampled nearly 70 miles of water ranging from 30-700 feet in depth.

The primary objective of this research is to sample fish and zooplankton populations to determine their abundance and distribution throughout Lake Huron. Our main focus is fish sampling with hydroacoustics and mid-water trawls. In addition to sampling organisms, we are also determining characteristics of the water column including temperature, depth, conductivity, oxygen, and fluorescence, to name a few. Quite often, factors like temperature and depth regulate where fish and invertebrates are found. rstand how fish and zooplankton interact with their environment.

We are also adding to an existing dataset that spans several years. As this dataset expands we are able to understand more fully long-term changes in animal populations, and which factors are related to the changes we see over time. These long-term observations provide the basis for our understanding of Great Lakes ecosystems.

We are primarily surveying prey fish species that are food for top predators and are mostly planktivorous (their diet consists mainly of zooplankton or other invertebrates). These include rainbow smelt (Osmerus mordax), bloater (Coregonus hoyi), alewife (Alosa pseudoharengus), and emerald shiner (Notropis atherinoides). These species make up the bulk of the food resources available to predatory fish in Lake Huron including lake trout (Salvelinus namaycush), pacific salmon (Oncorhynchus spp.), walleye (Sander vitreus) and others.


Pelagic Publishing Ltd Amphibian Biology, Volume 11 Part 3: Status of Conservation and Decline of Amphibians: Eastern Hemisphere: Western Europe
Book (Pelagic Publishing Ltd)

It's an issue with most freshwater fish if you

2008-01-21 12:10:09 by compare_them_with

Ocean fish...even predatory FW fish eat other stuff that bottom feeds and they pick up that flavor, while pelagic predatory fish like tuna eat other smaller fish and crustaceans that feed on krill and plankton.
Part of the issue with tilapia is that unlike other fish they tolerate extreme conditions of poor water quality...they are so tough they can live in fresh OR saltwater and anything in between...so it's easier for people who don't care about water quality to actually get them to market, where other fish would just die from neglect....but when raised properly they are pretty mild and aren't any muddier tasting than other FW fish that live in still waters.


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