Gracilaria (Rhodophyta) farming in Panay, Western Visayas, Philippines

Hurtado-Ponce, Anicia Q.; Samonte, Giselle P. B.; Luhan, Ma. R. J.; Guanzon, Nicolas G.

doi:10.1016/0044-8486(92)90089-4

Cited by 25 publications

(7 citation statements)

References 12 publications

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“…These factors contributed to the deposition of a thin layer of silt over thalli, which probably blocked the incident light and affected growth. Similar observations have been reported by other authors (Hurtado‐Ponce, Samonte, Luhan & Guanzon 1992; Nelson et al . 2001).…”

Section: Discussionsupporting

confidence: 93%

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Cultivation of Gracilaria (Rhodophyta) in shrimp pond effluents in Brazil

Marinho‐Soriano¹,

Morales²,

Moreira³

2002

Aquaculture Research

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Shrimp aquaculture produces a large amount of waste, including nitrogen and phosphorus. To investigate the utilization of those elements as sources of nutrients for the growth of the red seaweed, Gracilaria sp. J. Agardh, an experiment in shrimp pond effluents was carried out over a period of 5 months. The biomass varied significantly (P < 0.01), reaching a maximum of 2540 g m À2 and a minimum of 380 g m À2 . The mean was 1418 + 708 g m À2 . The higher biomass values occurred during the first 15 days and sometimes exceeded the initial inoculum by 190%. According to the results, production of 23.93 t ha À1 year À1 (dry weight) can be expected. anova showed significant differences in RGR (relative growth rate) values (P < 0.05). RGR varied from 8.8% per day to 1.8% per day. The fluctuation of nutrients was mainly influenced by pond fertilization frequency, with NH 4 being the most abundant nutrient. Correlations between RGR and environmental parameters during the study period were not significant (P > 0.05). We conclude that Gracilaria sp. can be cultivated in shrimp ponds effluents. However, despite this relative success, it is necessary to perform some adjustments regarding the utilized cultivation technique.

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Section: Discussionsupporting

confidence: 93%

“…Although the production of biomass of 380–2540 g m −2 was relatively low compared with tank culture (Ugarte & Santelices 1992), it was superior to values found in ponds by Shang (1976) in Taiwan and Hurtado‐Ponce et al . (1992) in the Philippines.…”

Section: Discussioncontrasting

confidence: 55%

Cultivation of Gracilaria (Rhodophyta) in shrimp pond effluents in Brazil

Marinho‐Soriano¹,

Morales²,

Moreira³

2002

Aquaculture Research

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“…Dominant variables to determine the seaweed production in the pond were also described in regression equation as follow: Average seaweed production in ASS-affected ponds of Luwu Regency was 11,000 kg/ha/year (Table 1). It was higher than the seaweed production obtained from culture in ponds of Western Visayas, Philippines (3-4 t/ ha/year), but similar to the culture production in natural drainage canals (7-14 t/ha/year) (Hurtado-Ponce et al, 1992). Although, seaweed production in ASS-affected pond is high, there are yet the opportunities to increase the productivity to achieve minimum number of 11,428 kg/ha/year.…”

Section: Resultsmentioning

confidence: 79%

“…A quarter to one third of the harvest was retained at every harvest and left in the ponds, which will continue to reproduce vegetatively for the next harvesting. Many researchers suggest for harvesting the first time at 45 days after stocked (Mubarak et al, 1990;Hurtado-Ponce et al, 1992;Kaladharan et al, 1996). Dry organic matter percentage in the fronds of Gracilaria sp.…”

Section: Resultsmentioning

confidence: 99%

DOMINANT FACTORS AFFECTING SEAWEED (Gracilaria verrucosa) PRODUCTION IN ACID SULFATE SOILS-AFFECTED PONDS OF LUWU REGENCY, INDONESIA

Mustafa

Sammut

2010

Indonesian Aquaculture Journal

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Most of brackish water ponds used for seaweed (Gracilaria verrucosa) culture in Luwu Regency, South Sulawesi, Indonesia are constructed on acid sulfate soil. Despite this inevitable condition, opportunities remain open to increase the seaweed production. The research was conducted to study the dominant factors that affect the seaweed production in ASS-affected ponds of Luwu Regency. As a dependent variable in this research is seaweed production. Independent variables were grouped into: (a) farmer status factor, consisting of 9 variables; (b) pond condition factor, consisting of 8 variables; (c) pond management factor, consisting of 29 variables; (d) soil quality factor, consisting of 17 variables and (e) water quality factor, consisting of 11 variables. Multiple regression with dummy variable was used to analyze the data in prediction dependent variable. Results show that the average of seaweed production in ASS-affected pond of Luwu Regency is 11,000 kg dry/ha/year. Seaweed production can be increased through: (a) decreasing dosage of urea and KCl and increasing dosage and frequency of fertilizer containing phosphate; (b) increasing water depth in the pond and decreasing percentage of water exchange, (c) conducting remediation to increase the soil pH and decreasing the concentration of Fe in the water, (d) increasing stocking density of milkfish to decrease the epiphyte population and (e) increasing the frequency of the farmer to attend trainings.

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“…Gracilaria mariculture is well-established in different parts of the world notably Asia, South America, and Southern Africa (Hurtado-Ponce et al 1992;Dawes 1995;Anderson et al 1999). Cultivation of Gracilaria is a relatively low-technology activity and it does not require specialized personnel.…”

Section: Introductionmentioning

confidence: 99%

Some Aspects of the Growth of Gracilaria birdiae (Gracilariales, Rhodophyta) in an Estuary in Northeast Brazil

2006

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The agarophyte Gracilaria birdiae Plastino & Oliveira was cultivated under field conditions in an estuary over a 6-month period. Biomass production varied significantly (p<0.01) and ranged from 900.0 to 3537.0 g m )2 with a mean of 2124.4±1004.36 g m )2 over the cultivation period. The epiphyte-biomass varied from 64.7 to 313 g m )2 , with maximum values observed in July. Relative growth rate (RGR) of G. birdiae varying from )0.59 to 4.67% day )1 , with a maximum mean observed in July. Correlation analysis showed that RGR was positively correlated with epiphyte-biomass (R-Pearson=0.69; p< 0.01) and negatively correlated with salinity (R-Pearson=)0.41; p<0.05). These correlations were used in a mathematical regression model to estimate the growth of Gracilaria in an estuary. The regression model explained 61% of RGR variability demonstrating that growth rates of Gracilaria were directly related to the variables salinity and epiphytes. The model was developed to help to predict production at a cultivation site in order to evaluate its suitability for Gracilaria cultivation.

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Gracilaria (Rhodophyta) farming in Panay, Western Visayas, Philippines

Cited by 25 publications

References 12 publications

Cultivation of Gracilaria (Rhodophyta) in shrimp pond effluents in Brazil

Cultivation of Gracilaria (Rhodophyta) in shrimp pond effluents in Brazil

DOMINANT FACTORS AFFECTING SEAWEED (Gracilaria verrucosa) PRODUCTION IN ACID SULFATE SOILS-AFFECTED PONDS OF LUWU REGENCY, INDONESIA

Some Aspects of the Growth of Gracilaria birdiae (Gracilariales, Rhodophyta) in an Estuary in Northeast Brazil

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