This week, we had sharks and other species of pelagic fishes. I and my group members picked up a shark with about 1.3 meter long body. Though dead, their morphology really excited me. The streamline body, heterocercal caudal fin and highly developed sensory structures. These features have been shaped in ancient time and still enable the organisms to indulge themselves in being on top on food chains.

When I accidentally squeezed (or just grabbed) the shark's head, red jelly (perhaps due to bood pigment) oozed out from sensory canals. We also observed lateral lines runnig on each sides of whole length from head to tail as we chopped it off at posterior trunk.

They are just cool creatures. I'd be stunned if I see them swimming alive. How fascinating.

Tags: beautifulworld.

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