Anguilla bengalensis bengalensis has been reported from different rivers of Chittagong and Mymensingh district in Bangladesh. But few information is available on this fish to the fish farmers as well as to the fisheries professionals. This article attempts to provide some information on this fish.
Freshwater eels are small- to large-sized fishes (to about 200 cm total length) occurring in most fresh waters of the world except\ principally those of the western side of the American continent and those bordering the South Atlantic. They are rather secretive during the day but actively forage at night, feeding mainly on a wide range of small bottom-dwelling invertebrates. These eels breed in the open ocean and ocean currents move the young larvae (leptocephali) coastward to where the juveniles invade fresh water. Most of the life is subsequently spent in lakes, streams and rivers but as maturity approaches the adults migrate seaward to spawn. Body elongate, but never greatly so, cylindrical in front, and only moderately compressed along the tail. Snout rounded, mouth terminal with the lower jaw projecting slightly, and moderately large, but never extending back much beyond eye; Teeth always small, conical and multi-serial to form narrow to broad bands on jaws and vomer (roof of mouth). Nostrils separated, the anterior one a sort, free tube, the posterior one a simple aperture in front of eye; Branchiostegal rays long but not overlapping ventrally; Gill opening a nearly vertical slit in front of pectoral fin. No spines in fins; dorsal and anal fins continuous around tail; Dorsal fin begins variously between pectoral fin and anus or over anus; pectoral fins always present; no pelvic fins. Minute, oval scales present, embedded in skin. Lateral line system present but not especially prominent, typically as a series of minute, white pores.
Freshwater eels are small- to large-sized fishes (to about 200 cm total length) occurring in most fresh waters of the world except\ principally those of the western side of the American continent and those bordering the South Atlantic. They are rather secretive during the day but actively forage at night, feeding mainly on a wide range of small bottom-dwelling invertebrates. These eels breed in the open ocean and ocean currents move the young larvae (leptocephali) coastward to where the juveniles invade fresh water. Most of the life is subsequently spent in lakes, streams and rivers but as maturity approaches the adults migrate seaward to spawn. Body elongate, but never greatly so, cylindrical in front, and only moderately compressed along the tail. Snout rounded, mouth terminal with the lower jaw projecting slightly, and moderately large, but never extending back much beyond eye; Teeth always small, conical and multi-serial to form narrow to broad bands on jaws and vomer (roof of mouth). Nostrils separated, the anterior one a sort, free tube, the posterior one a simple aperture in front of eye; Branchiostegal rays long but not overlapping ventrally; Gill opening a nearly vertical slit in front of pectoral fin. No spines in fins; dorsal and anal fins continuous around tail; Dorsal fin begins variously between pectoral fin and anus or over anus; pectoral fins always present; no pelvic fins. Minute, oval scales present, embedded in skin. Lateral line system present but not especially prominent, typically as a series of minute, white pores.
Anguilla bengalensis bengalensis is restricted to eastern part of area, from Pakistan to Sumatra): slightly fewer vertebrae 106 to 112, against 107 to 115 in A. bengalensis labiata).
More differences between Anguilla bengalensis bengalensis and A. bengalensis labiata are given below:
