Thành phần loài và đặc điểm phân bố theo mùa của họ cá đù (Sciaenidae) ở vùng cửa sông ven biển Tây tỉnh Cà Mau

Abstract

The study was conducted in the estuaries of the Cua Lon and Bay Hap, Ca Mau province, from August 2017 to June 2019 in order to determine the species composition and distribution characteristics of croakers. Samples were collected bimonthly by using push nets (totally 12 sampling times). The salinity in the investuagted areas ranged between 25-28 ‰ (Cua Lon River) and 21-25 ‰ (Bay Hap River). The results showed that ten species of croakers (Sciaenidae) were identified in which the fish species composition in Cua Lon is more diverse than in Bay Hap. The croaker species are widely distributed during rainy and dry seasons at all sampling sites. In Bay Hap river, the CPUE of croaker tends to decrease from inland to the estuarine areas, with 5.2 g.ha-1 to 0.05 g.ha-1, where the most abundant areas are in Cha La (3.3 g.ha-1) and Bay Hap (2.79 g.ha-1) in both seasons. In Cua Lon river, the abundance tends to increase gradually from inland to the estuarine areas (2.89 - 27.66 g.ha-1). In the rainy season, the highest abundance of croakers is at the sampling site Sa Pho with 31.16 g.ha-1and the lowest one is at Ong Trang site (0.12 g.ha-1).