Fish


Feature Writer: Douglas DuHamel
Doug DuHamel, mkf

Fish and invertebrates can live in freshwater, saltwater, ponds, mud puddles and swamps. Find out how you can replicate these diverse environments in your own aquarium through equipment such as lighting, water conditions, decorations and filtration.

Man has destroyed a large amount of the fish population. Discover how you can help save this fragile environment.

Learn about compatibility of fish species or find out how to prevent and treat various fish diseases. Discover how to culture live food for your fish.

Find out why breeding fish is a satisfying and profitable hobby.

If you have any fish-related questions, please post in the discussion area and I’ll get back to you with an answer.

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Frontosa at Vancouver Aquarium, Doug DuHamel
feature articles
Douglas DuHamel

Saltwater Fish in Freshwater Lakes

In: Fish (general)

Fish formerly found in saltwater were forced to adapt to their new habitat. more...

Wild and Fancy Guppies

In: Freshwater Fish

Guppies are prolific breeders and are able to live in a wide range of aquarium conditions. more...

Coelacanth Found In Indonesia

In: Saltwater Fish

This latest discovery of the extinct fish Coelacanth may be a clue for scientists to look outside of a fish's last known habitat. more...

The Lung Fish

In: Freshwater Fish

Evolution has not affected the Lung Fish and their internal organs have not changed for millions of years. more...

Keeping Koi Carp in Ponds

In: Freshwater Fish

A backyard pond can provide the perfect setting for koi carp if you re-create their natural environment. more...

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feature blog
Douglas DuHamel

May 11, 2008

Bering Sea Warming Up

In comparison to other oceans, the Bering Sea is showing more dramatic climate changes.


The Bering Sea produces 50% of all fish caught in America and 1/3 all the fish caught world wide. Chances are the last fish you ate came from the Bering Sea. Studies and experiments are suggesting the ecosystem will support less than what we are harvesting, like the Pollock and Hake.

The Bering Sea is showing climate changes before the rest of the oceans so this may be a sign of things to come. It is much warmer now and marine mammals and birds are having mass die offs, and there’s many invasive species. In general, it’s going through massive chances to a more temperate ecosystem that is not going to be as productive as the last.

The effects of carbon dioxides are often over looked by the general public. It’s good that people are starting to worry about melting ice and rising water levels world wide. We are only now starting to see a comprehensive change in the world’s ecosystem, and some of these changes don’t look great for the future.

Phytoplankton takes sun light and converts carbon dioxide into carbon based foods. Small fish eat the plankton, and bigger fish eat the smaller fish, and an entire ecosystem develops which just keeps repeating its self until some thing in the system is disturbed.

The Bering Sea is very productive thanks to diatoms a large type of phytoplankton. Large diatoms are eaten by large zooplankton in turn are eaten by large fish. When the phytoplankton becomes scarce the zoo plankton becomes scarce and all the sea creatures that eat the diatoms and zooplankton will also become scarce.

Thus the ecosystem seems to be changing in a way that doesn’t support the top predators, and the top of that list is MAN!

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