Disgestive enzyme profile of jelawat fish larvae (Leptobarbus hoevenii, Bleeker 1851)

¹ Department of Aquaculture, Faculty of Fisheries and Marine, Riau University, Pekanbaru, Indonesia
² Department of Aquatic Resources Utilization, Faculty of Fisheries and Marine, Riau University, Pekanbaru, Indonesia
³ Department of Masters in Chemistry Education, University of Riau, Pekanbaru, Indonesia

^* Corresponding author: nur.asiah@lecturer.unri.ac.id

Abstract

The ability of fish larvae to digest the appropriate type of feed can be seen through enzymatic activity. The digestive tract contains active enzymes including amylase, lipase and protease. This research was conducted at the Fish Hatchery and Breeding Laboratory, Faculty of Fisheries and Marine, Riau University and sample analysis at the Nutrition Laboratory, Bogor Agricultural Institute. The research aims to evaluate the ability of jelawat fish larvae (Leptobarbus hoevenii) to digest external feed through digestive enzymes. Newly hatched larvae are reared in fiber tanks measuring 2x1x0.5m with a density of 10,000 individuals, volume 1000 L. In rearing containers, larvae from 2 to 6 days old are given artemia food, starting from 7 days old they are given artificial F0 food. Feed was given twice a day in the morning and evening ad libitum. Observations were made on 0 day old larvae (D-0), (D-1) – (D-4), (D-6) and (D-8). Observation of protease, amylase and lipase enzyme profiles was carried out by sampling 1 gram of larvae. The results of observations on the activity of amylase, lipase and protease enzymes in jelawat fish were positively correlated with larval growth. Digestive enzyme activity increases when the larvae receive food from outside the body.