Nekton (fish, squid, whales and other free swimmers) Synthesis question: Why is there so much more plankton biomass than nekton biomass?

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Presentation transcript:

Nekton (fish, squid, whales and other free swimmers) Synthesis question: Why is there so much more plankton biomass than nekton biomass?

What are nekton? What are plankton? Which are bigger? Why? Can a species be both? At the same time?

Species fit in one or more of these levels. How does size change with pyramid level? Who inhabits these levels in the ocean? Are there more levels in the ocean? Why?

Cetaceans (Marine Mammals). What are they?

Two main kinds

Which have a greater biomass?

Whale “fishing” Some of the first international treaties on fisheries. Why international?

Seals Where are they on the food chain? Except some!

Crab eater seal What is the most common seal by biomass?

Squid!

Good eating…

Fish Where in the chain?

Herring, Anchovies, sardines

Cod, bluefish, flounder

Tuna, Sharks

Which fish are most likely to be overfished?