SB 5.18.24

ramyake ca bhagavataḥ priyatamaṁ mātsyam avatāra-rūpaṁ tad-varṣa-puruṣasya manoḥ prāk-pradarśitaṁ sa idānīm api mahatā bhakti-yogenārādhayatīdaṁ codāharati.

ramyake ca—also in Ramyaka-varṣa; bhagavataḥ—of the Supreme Personality of Godhead; priya-tamam—the foremost; mātsyam—fish; avatāra-rūpam—the form of the incarnation; tat-varṣa-puruṣasya—of the ruler of that land; manoḥ—Manu; prāk—previously (at the end of the Cākṣuṣa-manvantara); pradarśitam—exhibited; saḥ—that Manu; idānīm api—even until now; mahatā bhakti-yogena—by dint of advanced devotional service; ārādhayati—worships the Supreme Personality of Godhead; idam—this; ca—and; udāharati—chants.

Śukadeva Gosvāmī continued: In Ramyaka-varṣa, where Vaivasvata Manu rules, the Supreme Personality of Godhead appeared as Lord Matsya at the end of the last era [the Cākṣuṣa-manvantara]. Vaivasvata Manu now worships Lord Matsya in pure devotional service and chants the following mantra.