Morphometry and length-weight relationships of the freshwater pearl mussel Parreysia corrugata (Muller 1774) (Bivalvia: Unionidae) from Daya River, Odisha, India

Allometry in the freshwater mussel Parreysia corrugata was studied from east -flowing river Daya, Bhubaneswar, India. The results indicated that shell length (SL) -shell height (SH) and shell length -shell width (SW) relationships for P. corrugata were SH = 0.876 + 0.932SL and SW = 0.625 + 0.898SL. Greater correlation was found between SL and SW than between SL and SH. The length -weight, height -weight and width -weight relationships of P. corrugata were established as TW = 0.00038SL2.80, TW = 0.0006SH2.95 and TW = 0.0023SW2.97 respectively. The t -test value of b indicated an isometric growth pattern in the width -weight and the height -weight relationships. The highest r2 value was obtained for shell length -total weight and shell height -total weight equations. Present study will be helpful in strengthening the knowledge on interrelationship between the morphometric variables of P. corrugata and also in comparing with the earlier studies to know the existence of spatial or temporal variability in the morphometry of this species. This information can also be used to better understand the biology of P. corrugata and to improve the management of this species.