Lifecycle stages
The amount of eggs a female bluefin tuna can produce per year
What is 25 million eggs?
The male and female tuna migrate to these spawning grounds.
What is the Atlantic and Pacific oceans and Mediterranean Sea at certain times of year?
To avoid predators juvenile fish tend to do this.
What is school together?
This is what tuna larvae do after reaching a certain size and remaining in the spawning grounds.
What is they move out into the open ocean feeding grounds?
During spawning, many femals release eggs into the water while males release sperm.
What is broadcast spawning? (further explanation: It's called this because eggs and sperm from many individuals are in the water together)
The Atlantic bluefin tuna gather in these two regions during these times.
What is a region of the Mediterranean near the Balearic Islands between May and July, or in the Gulf of Mexico between April and June?
Tuna return here when they need to spawn.
What is the spawning ground in which they themselves were spawned?
This is the age range at which tuna reach sexual maturity.
What is between four and eight years of age, at which point they will migrate to the spawning grounds to mate?
This results in the increased genetic diversity of the tuna population.
What is random, external fertilization?
The Pacific bluefin tuna gather in these two regions during these times.
What is the north-west Philippine Sea and the Sea of Japan between April and August?
Male and female tuna do this generally at night.
What is swim together during spawning?
This happens to the fertilized eggs due to the presence of oils.
What is they float just beneath the surface of the water, where many are eaten by predators?
This happens as a result of tuna congregating in the same areas.
What is the increase in likelihood of successful mating and the increse of genetic diversity. (extra information: due to genetically different tuna breed together)
This is the amount of eggs bluefin tuna at age 5 produce.
What is 5 million eggs?
Tuna larvae live in this type of water and go through this stage after 2 days.
What is planktonic surface waters and hatching?
This is the temperature range Pacific Yellow Tuna favor.
What is temperatures between 64 and 88 degrees Fahrenheit?
This is the amount of eggs bluefin tuna at age 20 produce.
What is 45 million eggs?