Pertumbuhan dan Biologi Reproduksi Ikan Gulamah (Johnius trachycephlus) yang Didaratkan di Tempat Pendaratan Ikan (TPI) Gabion Belawan, Provinsi Sumatera Utara

Abstract

Leaftail croaker (Johnius trachycephalus) is a demersal fish resource that is widely caught and landed at fishing ports Belawan. Fresh Leaftail croaker is not in great demand by the public because its meat tastes rather bland, but it is usually processed into salted fish which causes the economic value of Leaftail croaker to increase. The large demand for salted Leaftail croaker puts pressure on Leaftail croaker resources, resulting in fishing efforts on fish resources. sugar increases every year. Of course, this will affect the population status of the Leaftail croaker resource, therefore it is necessary to take steps that can support sustainable use, especially those related to providing information regarding the size, weight-length relationship of the fish and their growth patterns. This research aims to determine the growth patterns and reproductive biology of Leaftail croaker. This research was carried out from November to January 2023 at 1 month intervals. Fish samples were obtained from the waters of the Malacca Strait and landed at the Gabion fish auction site (TPI) Medan Belawan, Medan City, North Sumatra Province. Number of Leaftail croaker samples for 3 months (November 2023 January 2024) 114 individuals were obtained, of which 33 individuals were obtained in November, 30 individuals in December and 51 individuals in January. The overall size of gulamah fish ranges from 120 – 250 mm. The growth pattern of the Leaftail croaker is negative allometric, the overall condition factor of gulamah fish ranges from 0.57 – 1.51, which is less flat, the Von Bertalanffy growth parameter with a growth coefficient (K) for male gulamah fish is 0.41 per year and for females is 0.49 per year. The infinitive length (L∞) value of male Leaftail croaker is 231 mm and female Leaftail croaker is 266.19 mm. The reproductive results show that the sex ratio is in a balanced state, namely 1.47: 1. The gonad maturity level of Leaftail croaker at the TKG I - TKG IV stages, the fecundity of Leaftail croaker eggs is between 1,520 eggs 56,459 eggs and based on the egg diameter, the Leaftail croaker is classified as a partial spawner.