The fish is never free from anxiety, since big fish are always eager to eat the small fish. All living entities are eaten by bigger living entities. This is the way of material nature.
The panoramic beauty of nature, which strikes one with wonder, may be taken as a perverted reflection of the transcendental body of the Lord.
Srimad Bhagavatam 3.8.24,
Nondevotees factually appreciate the wonderful creation of material nature, but they cannot appreciate the intelligence and energy of the Supreme Personality of Godhead, who is behind this material creation.
Sri Chaitanya Caritamrta,
Adi Lila 7.121
No one has the ability to imitate the activities of material nature as conducted by the Supreme Personality of Godhead.