Length and weight relationship, condition factors, and growth parameters of Gulamah fish (Johnius trachycephalus) landed at Tanjung Beringin’s Fish Auction Place (TPI) Serdang Bedagai Regency, North Sumatera Province

Abstract

This research was held three months from June-August 2022 and used a purposive random sampling method. The total sample was 137 gulamah consisting of 65 male and 72 female fish. The results showed that the total length (TL) of gulamah fish caught with gill nets ranged from 103-214 mm, with an average length of 155.74 mm. The weight of gulamah fish ranged between 12.77-126.02 grams with an average of 54.95 grams. Length-weight relationship of gulamah fish was positive allometric with the equation W=0.00001L3,15 (R² = 0.89) in male fish and W=0,00001L3,09 (R² = 0.92) in female fish. The range of the condition factor of gulamah fish is 0.43-1.12. Growth curve Von Bertalanffy equation shows the equation Lt = 234.4(1 - EXP(-0,59(t+0,063))for male gulamah fish and Lt = 217.8(1 - EXP(-0,33(t+0,058))) for female gulamah fish.