The effect of three cultivation methods and two seedling types on growth, agar content and gel strength of Gracilaria verrucosa

Rejeki, Sri; Ariyati, Restiana Wisnu; Widowati, Lestari Lakhsmi; Bosma, R.H.

doi:10.1016/j.ejar.2018.01.001

Cited by 25 publications

(25 citation statements)

References 16 publications

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“…cottonii had similar results to the previous studies which had obtained rates of 1.1%-3.4% [13], 0.2%-4.2% [14] and 1.1%-5.3% [15]. The off-bottom method is used to overcome pest problems, but can be done only on sandy soils where stakes can be plugged [16]. With this method, a very high farming with intensity in terms of seedlings per area unit can be achieved.…”

Section: Resultssupporting

confidence: 82%

Growth Rate of Kappaphycus striatum var cottonii at Different Positions of the Cultivation Lines to the Direction of Water Current

Nian¹,

Akrim²,

Jumah³

et al. 2018

JAST-B

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The study was conducted to determine the effects of different positions in cultivation lines towards the direction of water current on growth rate of Kappaphycus striatum var. cottonii for a duration of 45 d at 4°30′9.36″ N and 119°22′6.8″ E of Bungin Pondohan, Sitangkai, Tawi-Tawi. The experiment has three treatments; the parallel (T1), perpendicular (T2) and diagonal (T3) positions towards the direction of water current with five replicates in each treatment following the randomized complete block design (RCBD). Results showed that higher mean weight of 473 g and growth increment of 8.3 g/d were obtained from T3, although not significantly different from T1 and T2 with 431 g and 7.4 g/d, and 408 g and 6.8 g/d, respectively (p > 0.05). However, results showed statistically similar growth rates of K. striatum var cottonii among all treatments. Thus, the positions of cultivation lines with respect to the direction of the current have no significant effect on the growth of the said seaweed species. Hence, the treatments used are viable in growing K. striatum var. cottonii in the selected study site.

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Section: Resultssupporting

confidence: 82%

Growth Rate of Kappaphycus striatum var cottonii at Different Positions of the Cultivation Lines to the Direction of Water Current

Nian¹,

Akrim²,

Jumah³

et al. 2018

JAST-B

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“…Based on Table 4, SGR obtained from the GMS and GM polyculture system was 1.60 ± 0.31 and 1.44 ± 0.13% day -1, respectively. This result was higher than Rejeki et al (2018), who reported that the SGR of G. verrucosa cultured in the pond was 1.0 ± 0.3% day -1 and Lee et al (2019), who reported that the SGR of G. changii was 0.74 ± 0.25% day -1 . Temperature and salinity are the main factors of seaweed growth.…”

mentioning

confidence: 55%

The production function and profitability analysis of Gracilaria sp. seaweed polyculture with milkfish (Chanos chanos) and black tiger shrimp (Penaeus monodon)

2020

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Abstract. Diatin I, Effendi I, Taufik MA. 2020. The production function and profitability analysis of Gracilaria sp. seaweed polyculture with milkfish (Chanos chanos) and black tiger shrimp (Penaeus monodon). Biodiversitas 21: 4747-4754. Gracilaria seaweed is the main ingredient for making agar as a source of food and industry. Gracilaria culture in ponds with a polyculture system is one of the potential seaweed cultivation in Indonesia. This study was aimed to analyze the productivity, production input optimation, and profitability on the polyculture system of Gracilaria sp. with milkfish (Chanos chanos) and black tiger shrimp (Penaeus monodon). The survey method was used to notify the seaweed farmers from Indramayu, West Java, Indonesia. The study data were obtained from all seaweed polyculture farmers populations in the observational location by census containing two farmers groups, namely Gracilaria sp. with milkfish and black tiger shrimp (GMS symbol) and Gracilaria sp. with milkfish (GM symbol) polyculture system. This study resulted that GMS polyculture system obtained higher productivity than GM polyculture system. The GMS business scale was in the increasing return to scale condition, while GM was in the decreasing return to scale condition. The optimal condition of GMS polyculture system was performed by improving the black tiger shrimp seed input, milkfish seed, and milkfish feed, besides declining the working hours, while GM polyculture system was performed by decreasing the milkfish feed and farmers working hours. When the optimal condition is applied to the GMS polyculture system, then the business profit reaches five times, resulting in an increased profit margin of 112% with R/C becomes 134%. Meanwhile, GM polyculture system only reaches 65% business profit, 65% profit margin, and 25% R/C. The investment payback period from both polyculture systems became shorter. The application of production input efficiency on the GMS polyculture system is more prospective than GM polyculture system.

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“…Phosphate is one of the most important nutrients in cultivation to increase the growth of seaweed. According to the research results of Rejeki et al (2018), phosphate content between 0.24-5.97 mL/L can produce SGR of 1.3 %/day. The range of the value of nitrate and phosphate which is feasible for seaweed fertility is 0.1 -3.5 ppm.…”

Section: Water Qualitymentioning

confidence: 99%

“…According to Kim et al (2016), Gracilaria has a high tolerance to a temperature ranging from 0 -35 o C. The optimum temperature range can increase the growth of Gracilaria sp. because it can help to increase nutrient absorption, which is around 20-34 o C (Rejeki et al, 2018). Temperature changes that are too drastic will disrupt the growth process of G. verrucosa.…”

Section: Water Qualitymentioning

confidence: 99%

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

Susilowati¹,

Nadlir²,

Haditomo³

et al. 2019

omni.akua

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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 <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).

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The effect of three cultivation methods and two seedling types on growth, agar content and gel strength of Gracilaria verrucosa

Cited by 25 publications

References 16 publications

Growth Rate of Kappaphycus striatum var cottonii at Different Positions of the Cultivation Lines to the Direction of Water Current

Growth Rate of Kappaphycus striatum var cottonii at Different Positions of the Cultivation Lines to the Direction of Water Current

The production function and profitability analysis of Gracilaria sp. seaweed polyculture with milkfish (Chanos chanos) and black tiger shrimp (Penaeus monodon)

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

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