One verse

Srimad Bhagavatam 8.24.2-3

8.24.2-3

यदर्थमदधाद् रूपं मात्स्यं लोकजुगुप्सितम् । तम:प्रकृति दुर्मर्षं कर्मग्रस्त इवेश्वर: ॥ २ ॥ एतन्नो भगवन् सर्वं यथावद् वक्तुमर्हसि । उत्तमश्लोकचरितं सर्वलोकसुखावहम् ॥ ३ ॥

yad-artham adadhad rupam matsyam loka-jugupsitam tamah-prakrti-durmarsam karma-grasta ivesvarah etan no bhagavan sarvam yathavad vaktum arhasi uttamasloka-caritam sarva-loka-sukhavaham

yat-artham
for what purpose
adadhat
accepted
rupam
form
matsyam
of a fish
loka-jugupsitam
which is certainly not very favorable in this world
tamah
in the mode of ignorance
prakrti
such behavior
durmarsam
which is certainly very painful and condemned
karma-grastah
one who is under the laws of karma
iva
like
isvarah
the Supreme Personality of Godhead
etat
all these facts
nah
unto us
bhagavan
O most powerful sage
sarvam
everything
yathavat
properly
vaktum arhasi
kindly describe
uttamasloka-caritam
the pastimes of the Supreme Personality of Godhead
sarva-loka-sukha-avaham
by hearing of which everyone becomes happy

What was the purpose for which the Supreme Personality of Godhead accepted the abominable form of a fish, exactly as an ordinary living being accepts different forms under the laws of karma? The form of a fish is certainly condemned and full of terrible pain. O my lord, what was the purpose of this incarnation? Kindly explain this to us, for hearing about the pastimes of the Lord is auspicious for everyone.