Saving Seafood

Copepods: Cows of the Sea

October 6, 2017 — If you look very closely at a glassful of water from a bay or the ocean, you would probably be surprised by the life inside. You might see miniature crustaceans the size of the period at the end of this sentence or baby crabs and fish that spend only a short span of their lives this small. These creatures are zooplankton, aquatic animals that drift with the currents.

It’s the Little Things 

These tiny animals form the basis of the food web of estuaries, coastal waters, and oceans. Zooplankton feed on microscopic plant-like organisms called phytoplankton, which get their energy from the sun. Tiny crustacean zooplankton called “copepods” are like cows of the sea, eating the phytoplankton and converting the sun’s energy into food for higher trophic levels in the food web. Copepods are some of the most abundant animals on the planet.

Fish such as anchovies cruise through the water with their mouths wide open, filtering copepods and other zooplankton from the water. Anchovies and other planktivores (plankton-eaters) are prey for bigger animals, like tuna, sharks, marine mammals, and seabirds.

Read the full story at NOAA Fisheries GARFO

Maine must address the threat of ocean acidification

June 6, 2016 — Mainers have strong cultural, historic and economic ties to the ocean. The health of the ocean is critical to our way of life. Ocean acidification is a growing problem that could damage the health of the ocean and have drastic consequences for Maine’s coastal economy.

Ocean acidification results when there is increased carbon dioxide in the atmosphere. As the amount of carbon dioxide in the atmosphere goes up, a large proportion of it – up to 40 percent – gets dissolved in rainwater. From here it ends up in lakes, ponds, rivers and ultimately the ocean.

In addition to the increased atmospheric carbon dioxide, nutrients in the runoff from the land, like fertilizer, also increase the amount of carbon dioxide entering the ocean. The increased carbon dioxide reacts with the water to form carbonic acid, making it more acidic.

The increased acidity of sea water impacts marine life. One of the most important effects is how the acid changes the way organisms use calcium. Calcium is critical to the entire food chain in the Gulf of Maine. The planktons, which make up the base of the food chain, decrease in number as the acidity of the ocean rises, and this in turn has an impact on finned fish.

For shellfish, the impact is even more dramatic. The acid interferes with the way shellfish such as clams, mussels, scallops and even the iconic Maine lobster build their shells. It also can corrode shells. If we don’t find and adopt solutions, ocean acidification could cause major problems for most, if not all, of Maine’s commercial fisheries.

Read the full story at the Portsmouth Herald