Plants with the bluefin tuna

  • Free-floating algae -- often called seaweed
    • Red algae ( Rhodophyta) -- Porphyra (from which edible nori is made), dulse, Ceramium and maerl
    • Green algae (Chlorophyta) --thongweed, sea lettuce (Ulva)
    • Brown algae (Phaeophyta) -- like fast-growing kelp, Sargassum, Turbinaria, Dictyota, and wrack
  • Phytoplankton -- tiny, one-celled photosynthetic plankton like diatoms, dinoflagellates, and coccolithophorids

· Red algae
· Green algae
· Brown algae
· Seaweed
· Phytoplankton
· Big shark
· Killer whales
· Blue fin tuna
· Marcel
· Anchovies
· Mesopelogics
· Small squids
· Sea urchin
· Misc. fish
Marine mammals

The largest threat to the blue fin tuna is over fishing. The bluefin tuna has been overfished for decades and is nearing extinction. The reason why this is such a problem is that the bluefin tuna is one of the highest predators on the Mediterranean’s food chain. In Japan the bluefin tuna is raised in farms when they were younger and sold for less so the Japanese can stay up with the cost of sushi and seafood. Most of the overfishing threat comes from illegal fishing and selling. If the blue fin tuna goes extinct which is likely to happen the ecosystem will be greatly affected because the mackerel will get over populated because they will not be killed by blue fin tuna. And humans will not have any more huge tuna for a nice dinner. Large sharks will also have no more of the largest tuna in the world to eat
The main threat to the blue fin tuna is over fishing them. Another threat the blue fin tuna is big sharks. It is bad if the blue fin tuna goes extinct because it is a part of the food web and if it dies it will mess up the food web. We can help not make the blue fin tuna go extinct by stop over fishing them. Also we can help by maybe not fishing them at all and to temporarily ban global trade. We should do all of these two things so the blue fin tuna does not go extinct.

The way that we can save blue fin tuna is to fight against over fishing of the blue fin tuna. We can have licenses for important people to be able to fish to be able to sell fish for stores. And we could send American fishers to go destroy the Japanese illegal fishing boats that are over fishing the bluefin tuna. We could also make conservation camps to put the bluefin tuna in so they don’t go extinct. And we could put banners up saying to save the bluefin tuna to persuade normal people to do things to help and save the bluefin tuna.

Abiotic and biotic facts of the Marine Ecosystem
The bluefin tuna lives in a marine ecosystem in the euphotic zone in the ocean. This zone can extend 50 feet deep but on average this zone extends to 660 feet. The depth of this ocean is ranged to 13,000 feet to 4,000 meters. Temperatures in this zone can go between 104 to 27 degrees Fahrenheit.
Photosynthesis happens here which allows the plants to make their food and produce 90% of the earth’s oxygen. It is the smallest zone in the ocean in terms of the amount of water but most of the marine life is found here.
Some of the major plants in this zone include red algae, seaweed, green algae, brown algae, and phytoplankton. Common animals found in this zone are the big shark, killer whale, bluefin tuna, mackerel, anchovies, mesopeliogics, misc. fish, small squids, sea urchins, and marine mammals.

Abitoic Factors
Sunlight Zone
· In clear water, the euphotic zone can be quite deep; in murky water, it can be only 50 feet deep
· On average, it extends to about 660 feet
· The depth of the ocean averages about 13,000 feet or 4,000 m
· The temperature in this zone ranges from 104 to 27 degrees F
· Photosynthesis in the oceans creates approximately 90% of the Earth's gaseous oxygen
· Most of the oxygen is produced by phytoplankton
· Because of this food source, many animals also live in this zone
· In fact, most of the life in the ocean is found in this zone
· it is the smallest ocean zone in terms of volume of water

Original image: 'Red Algae'
by: Ed Bierm

Original image: 'The seaweed is always greener in somebody else's lake'
by: Ian Hsu
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by: Magalie L'Abbé
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Shouka the Killer Whale and Merlin the Dolphin'
by: Jerry
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Tiger shark'
by: Willy Volk
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Holy Mackerel'
by:Original image: '
by: Abigail Powell
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Sea Pig'
by: Neptune Canada
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by: Riley
Original image: '
More phytoplankton zooplankton'
by: Dick
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by: Robyn Jay
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Original image: 'Tsukiji Market'
by: Matt Saunders
Original image: 'Bluefin Tuna Demo 213'
by: myke lyons
Original image: '
by: Mithril
Original image: '
Tsukiji Market'
by: Matt Saunders

by: Antonio Guillén

the top predators of the Med's food-chain, crucial to the Med's delicate ecosystem.
**Take Action**
But they are in serious trouble. The Med bluefin tuna fishery is worth some US$1bn - in Japan a single tuna can sell for US$ 15,000. But there simply aren't enough bluefin to sustain the world's insatiable appetite. In 1999, we recorded how Med bluefin stocks had declined by 80 percent, and it's getting worse. Rampant over-fishing and pirate fishing is pushing this precious species to the brink of extinction.
The latest development, tuna farming in the Mediterranean, could be the final nail in the coffin for the endangered eastern population.
farms are actually fattening pens for live-caught bluefin tuna, and supply a new market in Japan for cheaper bluefin tuna for sushi and sashimi. Suddenly, the prized bluefin was affordable for nearly all Japanese, not just the wealthy. Demand soared...and so did the fishing effort.
Illegal fishing
Clearly, with catches vastly exceeding the quota, a large percentage of the bluefin tuna catch comes from illegal, unregulated and unreported (IUU) fishing.