Length ratio, histological structure, feed composition, and enzyme activity in the gut of yellow rasbora (Rasbora lateristriata Blkr.)

Untung Susilo,Ridwan Affandi,Purnama Sukardi

doi:10.1051/e3sconf/202132201039

Untung Susilo, Ridwan Affandi + Show 1 more

Open Access

https://doi.org/10.1051/e3sconf/202132201039

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Abstract

A study of the ratio of gut length, histological structure, feed composition, and enzyme activity in the foregut had carried out to determine the feed category of yellow rasbora. The study used a survey method with sampling in the Banjaran River, Banyumas, Central Java. The research data had analyzed quantitatively and descriptively. The results showed that the gut length ratio of yellow rasbora ranged from 0.53 to 0.81. Gut histological showed no stomach structure with the relative height of the villi in the middle intestine approaching 0.5. Feed composition in the foregut showed that 60% was animal, and the rest were detritus and microalgae. Measurement of protease activity at foregut showed that no acidic protease activity but found alkaline proteases. In conclusion, yellow rasbora was an omnivorous fish with a short intestine and no functioning stomach.

Highlights

Fish based on their main diet are classified as herbivores whose main diet is plants, omnivores whose main diet is a mixture of plant and animal feed, and carnivores whose main diet is animal feed
Omnivorous fish have a gut length ratio to body length in an intermediate position, as found in gobies Amblygobius phalaena and Valenciennea sexguttata have a ratio of the intestine to body length of 1.3-2.1 and 1.151.54 [2]
The purpose of this study was to determine the ratio of intestinal length, intestinal histological structure, feed composition, and foregut protease activity to determine the category of yellow rasbora based on their diet

Summary

Introduction

Fish based on their main diet are classified as herbivores whose main diet is plants, omnivores whose main diet is a mixture of plant and animal feed, and carnivores whose main diet is animal feed. Herbivorous fish generally have a larger ratio of gut length to body length than fish with higher trophic levels [1]. The carnivorous fish generally have a ratio of gut length to body length less than one as in the Gobi fish Cryptocentrus cinctus, which has a short intestine (ratio 0.73-0.96), and Eleotris sandwicensis has a short intestine (small ratio) [1, 2]. In Puntius stoliczkanus (Cyprinidae) has an intestine length in the intermediate position with a relative gut length of 1.93 ± 0.21 (2 times body length) and was grouped as a herbivorous fish [3], Austrolethops wardi has an intestine ratio of 0.77- 1.17 was included in the herbivore group [2]

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