Kepadatan, Morfometrik dan Pola Distribusi Udang Mantis (Harpiosquilla raphidea) di Perairan Estuari Suaka Margasatwa Karang Gading Kabupaten Deli Serdang

Abstract

Mantis shrimp (Harpiosquilla raphidea), one of economically important commodity in Karang Gading, Deli Serdang, had a risk of population decline due to uncontrolled fishing. The research was conducted to analyze population density, morphometric characteristics, ditribution pattern, and correlation between physicochemical parameters and density of mantis shrimp. The research was conducted in Karang Gading wildlife sanctuary of Deli Serdang from July until September of 2021, with the samppling done on 3 stations chosen by purposive sampling. The total mantis shrimp individuals caught is 66, with the station 1 density of 4,83 ind/m2, on station 2 of 3,83 ind/m2, and station 3 of 2,33 ind/m2. Morphometric characters that have a strongly correlated effect were found in station 2 (total length with carapace length), a weakly correlated was obtained at station 1 (total length with carapace length), station 2 (total length with abdominal width, total length with telson width and total length with propodus length), station 3 (total length with carapace length, total length with abdominal width, total length with telson width and total length with propodus length) and moderately correlated was obtained at station 1 (total length with abdominal width, total length with telson width and total length with propodus length), all relationships between morphometric characters showed negative allometric growth patterns. The relationship between total length and weight is obtained by the value of b < 3, which is negative allometric. The distribution pattern oneach station were categorized grouped and unifoem with Id value of 0,791 – 1,004. Analysis results that strongly correlated and valued positively were salinity, current speed and DO (Dissolved Oxygen), those with strongly correlated and valued negatively were temperature, water brightness and BOD5, moderately correlated and valued positively were pH and nitrate, strongly correlated and negatively valued (water depth) and weakly correlated and negative (phosphate).