Nutrient digestibility of green seaweed Ulva meal and the influence on growth performance of Nile tilapia (Oreochromis niloticus)

Abstract

Green seaweed Ulva had a high growth rate and spread in all of Indonesian waters. Species Ulva had a complete nutrient content that made it potential to be used as an alternative fish feed ingredient. This experiment was conducted in two series of trial, digestibility measurement of Ulva meal and its effects on the growth performance of the Nile tilapia (O. niloticus). In measuring the nutrient digestibility, a protein rich diet was formulated with a test diet in which 30% of the reference diet was replaced with Ulva meal, used Cr2O3 as an inert marker. Fish with initial weight about 16±0.35 g were stocked with a density of 15 fish per aquarium and collecting faeces is carried out until sufficient sample was available for analysis. The growth trial was conducted using a completely randomized design with four treatments and three replications. The experimental diets were U0 (Ulva 0%), U10 (Ulva 10%), U20 (Ulva 20%) and U30 (Ulva 30%). The Nile tilapia with an average body weight of 3.42±0.01 g, were stocked into the 60x50x50 cm aquaria with 25 fish in each tank and cultured for 60 days. Fish were fed three times daily on those diets at satiation level. The parameters which evaluated were specific growth rate, protein retention, lipid retention, feed efficiency, survival rate and blood hematology of the Nile tilapia. The results of digestibility measurement showed that Ulva meal had acceptable nutrients as an ingredient in Nile tilapia diet. Protein digestibility of Ulva meal was 87.36%, while lipid was 93.05%. The results of growth trial revealed that fish fed on 10% Ulva meal tended to have highest growth performance than those fed to the control, while the survival rate and fish health seemed not to be affected directly (P>0.05).

EFFECT OF Lemna gibba AND Ulva lactuca ON HEALTH AND PRODUCTIVE PERFORMANCE IN JUVENILES OF NILE TILAPIA (Oreochromis niloticus)

“…Abdel-Wahab et al (2016) explained that the decrease in growth at high levels of Ulva meal (30 %) could be due to the high fiber content and its possible effects on protein and dry matter digestibility. The variation in chemical constituents of aquatic plants such as U. lactuca is influenced by the environment in which they are found (Suryaningrum and Samsudin, 2020). The diets with MOS had no effect on fish growth, which is in agreement with that reported by Soares et al (2018), who explained that the effect of MOS on growth in fish depends on the species to which it is supplied, the time of application and the temperature of the environment.…”

“…U. lactuca has also shown to promote growth when included at 20 to 30 % in the diet of African catfish Clarias gariepinus (Abdel-Wahab et al, 2016) and at 5 and 10 % in juvenile fish Scatophagus argus (Yangthong and Ruensirikul, 2020). In tilapia diet it has been included at 10 %, although inclusion up to 20 % is suggested, with satisfactory results in growth, feed utilization and survival rate (Suryaningrum and Samsudin, 2020).…”

Improving Production, Chlorophyll a and Carotenoids Contents of Gracilaria sp. with Liquid Organic Fertilizer from Alginate Waste

“…(Dewi et al, 2019). Some studies have also reported from other seaweed (Ulvalactuca) (Suryaningrum and Samsudin, 2020) on mung bean seedlings (Castellanos-Barriga, 2017), as well as Enteromorpha sp. (Yousif et al, 2004).…”

Efektifitas Pakan Rumput Laut Gracilaria verrucose Terhadap Laju Kecernaan Dan Retensi Protein Ikan bandeng (Chanos chanos Forsskal)

“…Nilai nutrisi pakan ikan tergantung pada jumlah ketersediaan zat-zat makanan yang dibutuhkan oleh ikan untuk pertumbuhannya. Cara untuk mengetahui dan mengukur ketersediaan zat-zat makanan bagi tubuh ikan tersebut adalah melalui penentuan kecernaan (Suryaningrum & Samsudin, 2020). Pakan dengan tingkat kecernaan yang tinggi akan membuat sisa buangan metabolisme ke lingkungan perairan menjadi rendah (Zainuddin et al, 2018).…”