After an ocean fishing trip, you return with a species that you have not encount

Question

After an ocean fishing trip, you return with a species that you have not encountered before. Your curiosity will not allow you to dismiss your catch without proper identification. Your fishing buddy argues that this is just another species of bony fish. As you observe the fish more closely, you conclude that it belongs with a taxonomic grouping that includes the sharks. What observed feature of your catch would lead you to such a conclusion (that it was a shark, NOT a bony fish)?

a bony skeleton

position of the eyes

liver

lateral line

Explanation / Answer

In the above mentioned Liver is NOT present in bony fish, but is present in Shark

The bony skaleton is absent in case of Sharks but present in Bony fish

Here are some differences between Shark vs Bony fish

1. Internal Skeleton made of Cartilage
2. Upper jaw not attached to the skull, it can move independently
3. Gills without operculum
4. Half moon shaped ventral mouth
5. They have squalene-Liver
6. They have eye lids called nictating membrane

1. Internal Skeleton made of calcified bones
2. Upper jaw is attached to skull
3. 4 pairs of Gills with covered with Operculum
4. Terminal Mouth
5. They possess Swim Bladder
6. No eyelid

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