Declension table of ?kṛṣṇamatsya

Masculine	Singular	Dual	Plural
Nominative	kṛṣṇamatsyaḥ	kṛṣṇamatsyau	kṛṣṇamatsyāḥ
Vocative	kṛṣṇamatsya	kṛṣṇamatsyau	kṛṣṇamatsyāḥ
Accusative	kṛṣṇamatsyam	kṛṣṇamatsyau	kṛṣṇamatsyān
Instrumental	kṛṣṇamatsyena	kṛṣṇamatsyābhyām	kṛṣṇamatsyaiḥ kṛṣṇamatsyebhiḥ
Dative	kṛṣṇamatsyāya	kṛṣṇamatsyābhyām	kṛṣṇamatsyebhyaḥ
Ablative	kṛṣṇamatsyāt	kṛṣṇamatsyābhyām	kṛṣṇamatsyebhyaḥ
Genitive	kṛṣṇamatsyasya	kṛṣṇamatsyayoḥ	kṛṣṇamatsyānām
Locative	kṛṣṇamatsye	kṛṣṇamatsyayoḥ	kṛṣṇamatsyeṣu

Compound kṛṣṇamatsya -

Adverb -kṛṣṇamatsyam -kṛṣṇamatsyāt