michael friesen's post

CMAS Diver 3 Star

#fintastic, I don't have any videos/photos, so here are some facts I will be sharing daily: Day 14: As mentionned during the Day 12 fact, sharks have a sligntly negative boyancy. To be able to sustain a horizontal swim for a long duration they need to counteract the gravity forces pulling them down. They use two techniques for this: they have a heterocercal caudal fin: the top half of the the tail fin is longer than the bottom half and their bodies aren't perfectly horizontal when they want to maintain a specific depth. the longer top half of the heterocercal tail creates a 20º downward current, which, when combined with the 10º angle of attack of the shark, allows them to maintain the current depth. To climb or decrease their depth they can respectively decrease or increase the angle of attack. #fintastic

michael friesen's post

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