The effect of thickness mangrove mud substrate media on growth and survival rate of sea worms (Nereis sp.)

Abstract

Abstract Nereis sp. is a type of sediment-eating organism (deposit feeder) which harness organic materials provided by other organisms as food. Nereis sp. has slow growth, because thickness and the type of substrate in which it grows is less than optimal. The aim of this study is to examine the effect of mangrove mud substrate media thickness on the growth and survival rate of Nereis sp. Research animal in the form of Nereis sp. aged 2-3 months. Experimental media used in this study was mangrove mud substrate which has a high nutrient content with different thickness of substrate media. The experimental method used in this study was a completely randomized design (CRD) (4 treatments and 3 replications). Treatments A (thickness 3 cm), B (thickness 6 cm), C (thickness 9 cm) and D (thickness 12 cm). The results showed that treatment C has the highest absolute growth, SGR, FUE, FCR, PER and SR were 6.66 ± 1.18bc, 0.43 ± 0.01bc, 68.93 ± 12.67a, 1.35 ± 0.13b, 1.72 ± 0.34a, and 97.00 ± 3.61bc. In conclusion the thickness of the mangrove mud substrate media significantly different (P<0.05) on Nereis sp.