Fish reproduction and cartilaginous fishes
Answers are for parents and teachers.
1
Compare how carp and perch treat offspring.
Both leave their eggs and lay many; most perish.
2
Give 3 examples of migratory fishes.
Chum and pink salmon (sea to river), eel (river to sea).
3
Compare shark and carp by 3 features.
Shark: cartilage skeleton, no gill cover, no swim bladder. Carp: bone skeleton, has gill cover and swim bladder.
4
If a ray meets a predatory fish, how might it survive? Write 2–3 ways.
It lies on the bottom and blends with the sand; some species stab with a venomous spine or give an electric shock.
5
Explain deep-sea fishes’ adaptation.
In the dark they have light-producing organs.