Riga Ostvald secondary school
There are more than 465 known species of
sharks living in our oceans today. Sharks are an
apex predator at or near the top of their marine
food chains, and they regulate the populations of
species below them.
The deep-bodied queen triggerfish has suitably regal
colouring; it is a flamboyant, and variable.Triggerfish
are named after the spines situated on their backs.
The first large spine can be erected and then locked
into place by the second smaller spine which fits into
a groove in the first spine.
The massive and well-known great hammerhead has
the most distinctive hammer of its genus. It is
particularly wide and virtually straight along the front
edge, with just a small notch in the centre.
Dolphins are cetaceanmammals closely related
to whales and porpoises. There are almost forty
species of dolphin in 17 genera. They vary in size
from 1.2 m and 40 kg (Maui's dolphin), up to 9.5 m (
and 10 tonnes.
• The blue whale is the largest animal to have ever
• The heart of the blue whale is the size of a small car
and can weigh up to 900 kg!
• During the summer months, the blue whale can eat
more than 4 tonnes of krill every day.
• Individual blue whales can be identified by the
mottled pattern on their skin.