Thryssa mystax is silver, darker dorsally. There is a distinctive dark blotch behind upper part of gill opening, which can easily identify the species from other "Thryssa" species. Caudal fin is yellowish. It feeds on planktons, fish larva, and small crustaceans like shrimp larva. Thryssa mystax The moustached thryssa ("Thryssa mystax"), also known as Gangetic anchovy, is a species of oceanodromous ray-finned fish in the family Engraulidae. It is found in the tropical western Indo-Pacific region from India, Sri Lanka to Myanmar and south to Java, and Indonesia. It is a small schooling fish found in depth of 0-50m. Maximum length do
Argyropelecus sladeni for Conservation of Nature has rated its conservation status as being of "least concern". Argyropelecus sladeni Argyropelecus sladeni (Sladen's hatchetfish) is a species of ray-finned fish in the family Sternoptychidae, found in the tropical and subtropical Atlantic, Indian and Pacific Oceans. This small fish lives in the mesopelagic zone by day and makes a daily vertical migration to the epipelagic zone at night. "Argyropelecus sladeni" is a small, deep-bodied hachetfish with an abdominal keel and a maximum standard length of about . The mouth is of medium size, the tubular eyes point upwards, the dorsal fin has nine soft rays