Production Performance of <i>Gracilaria verrucosa</i> using Verticulture Method with Various Wide Planting Area in Karimunjawa

Abstract

Gracilaria verrucosa is one type of seaweed that can be developed into a high-value product. Market demand for agar reaches 21.8% per year, but only 13.1% can be met. This is due to the low level of production of G. verrucosa in Indonesia. Utilization of G. verrucosa is still relying on aquaculture from the farm, which causes low production. Cultivation of seaweed with verticulture methods can increase the production of G. verrucosa. Karimunjawa is a potential area for seaweed cultivation. The aim of this study is to determine the effect of different density areas on the growth and production of G. Verrucosa and to determine the best density area for its production in Karimunjawa. This research used G. verrucosa wrapped in a mesh size of 0.5cm with a weight of 50g per pack. Each verticulture strap contains 4 packs and each treatment consists of 9 straps. The treatment was in the form of differences in the planting area of 25x25cm2 (A), 50x50cm2 (B) and 75x75cm2 (C). The results showed significant differences (P &lt;0.01) between each treatment. The 75x75cm2 area has the best yield on absolute growth, relative growth rate (RGR) and specific growth rate (SGR) of 83.10 ± 4.12g; 3.96 ± 0.20% / day and 2.33 ± 0.07% / day. The best results of G. verrucosa production obtained at an area of 50x50cm2 (5.32 ± 0.26 kg / m2).

Growth of Gracilaria sp. in Monoculture and Polyculture System with Milkfish (Chanos chanos Forsk) in Traditional Ponds, Brebes Regency, Central Java

“…The nitrate content in this study pond is classified in the range suitable for the cultivation of Gracilaria sp. The range of nitrate values suitable for seaweed growth is 0.1 -3.5 mg.L -1 (Nadlir et al 2019). Nitrate content in pond waters is critical because it is needed to support the metabolic process, growth, and survival of Gracilaria sp (Agustang, Mulyani & Indrawati 2019).…”

“…cultivation, while in the polyculture ponds, they are classified as suitable. The range of phosphate values suitable for seaweed growth is 0.1 -3.5 mg.L -1 (Nadlir et al 2019). Phosphate in waters is naturally sourced from the weathering of mineral rocks and the decomposition of organic matter.…”

PENGARUH PEMBERIAN PUPUK UREA DENGAN DOSIS BERBEDA TERHADAP PERTUMBUHAN RUMPUT LAUT (Caulerpa lentillifera)

“…Hasil pengukuran pertumbuhan spesifik harian (Caulerpa lentillifera) yang dipelihara selama 35 hari mengalami penurunan pertumbuhan, dimana menunjukkan bahwa perlakuan A tidak berbeda nyata dengan perlakuan B, C, dan D. Salah satu penyebab rumput laut mengalami penurunan pertumbuhan yaitu proses penyesuaian rumput laut (Caulerpa lentillifera) dengan lingkungan terkontrol kurang maksimal sehingga rumput laut mengalami kematian di awal-awal penelitian dan menyebabkan penurunan pertumbuhan. Nadlir et al (2019) menyatakan bahwa rumput laut yang telah mengalami proses adaptasi kemudian mengalami fase pertumbuhan yang cepat dan kemudian terjadi penurunan kemampuan pertumbuhan sel yang menyebabkan pertumbuhan lambat. Adapun laju pertumbuhan spesifik dapat dilihat pada Gambar 2.…”

Optimizing Quality and Growth of Gracilaria verrucosa (Gracilariaceae: Gracilariales) in Extensive Ponds

“…Faktor suhu, pH, salinitas, kandungan karbon, nitrogen, dan fosfor pada tanah dan air dapat mempengaruhi pertumbuhan dan metabolisme nutrisi rumput laut (Rahim 2018a). Parameter lingkungan merupakan salah satu hal terpenting yang perlu diperhatikan sebelum melakukan budidaya rumput laut (Susilowati et al 2019). Gracilaria verrucosa memiliki kisaran suhu optimal sebesar 35°C (Kim et al 2016).…”