The Paradise threadfin, Polynemus paradiseus is a marine fresh and brackish water fish species of the family Perciformes. This fish is found in Bangladesh, India, Malaysia, Myanmar, Thailand, Pakistan and Cambodia. Only a few studies on P. paradiesus including biology, ecology and dynamics have been conducted. This study focus on the on the Length Frequency Distribution (LFD), length-weight relationships (LWR) and Length Length Relationships (LLRs) of P. paradiseus from the coastal Tetulia River, southern Bangladesh.