Culture of Gracilaria sp. in outdoor tanks: productivity

Edding, Mario; Macchiavello, Juan; Black, H.J.

doi:10.1007/978-94-009-4057-4_55

Cited by 5 publications

(4 citation statements)

References 3 publications

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“…The seasonal pattern of productivity of C. canaliculatus followed that reported for other algae from temperate coasts, with maxima in spring and minima toward winter (Edding et al 1987). The continuous production observed for C. canaliculatus cultivated in tanks could reach a mean of 6.5 wet Kg year -1 m -3 (128 g dw m -3 wk -1 ) at the most favorable density.…”

Section: Discussionmentioning

confidence: 67%

“…Vega and Meneses (1999) described the seasonal and spatial (i.e., intertidal versus subtidal stands) variations in the productivity and reproduction of C. canaliculatus under field conditions in a population at Puerto Aldea, in north-central Chile. Our previous experience with mass cultures of marine algae in outdoor tanks (Edding et al 1987;Edding 1995), as well as that of other authors (e.g., Bidwell et al 1985;Braud and Armat 1996) led us to examine the feasibility of cultivating C. canaliculatus in the laboratory and in outdoor tanks as a way of insuring the long-term stability of supply and price of carrageenan-containing raw material. The advantages of seaweed farming would be: (a) independence from fluctuating climatic conditions, (b) independence from the labour-intensive seaweed collecting, (c) increased purity of raw material, and (d) the possibility of choosing seaweed strains with high carrageenan yields and carrageenan having desired compositions and properties.…”

Section: Introductionmentioning

confidence: 98%

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Cultivation of Chondrus canaliculatus (C. Agardh) Greville (Gigartinales, Rhodophyta) in controlled environments

et al. 2007

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Increased market demand for algal raw materials has stimulated research and development into new cultivation technologies, particularly in countries with economically important seaweed industries. Chondrus canaliculatus is a red alga endemic to the temperate Pacific coast of South America and produces a complex carrageenan. In Chile, this potential marine resource has been underutilized since the early 1990s, after it was replaced mainly by imports of Kappaphycus and Eucheum from Asia. The study of the cultivation of C. canaliculatus in outdoor tanks demonstrates the potential to produce large quantities of algal material due to the high productivity observed. The material produced may be important in Chile as feed for cultured algal herbivores such as Haliotis spp. Data were obtained on the key factors affecting the growth of this alga, including light, temperature, and nutrient concentrations. The results showed that, on a dry weight basis, productivity varied seasonally between 40 g m -3 wk -1 in autumn and 200 g m -3 wk -1 in spring, and the optimal stocking density in our experiments was 8 kg m -3 . Effects of selfshading were among the most important limiting factors in the culture. Discussion is presented on the interactions between temperature, pH, salinity, enrichment with N and P, and water exchange on the maximal growth of C. canaliculatus in this culture.

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Section: Discussionmentioning

confidence: 67%

Section: Introductionmentioning

confidence: 98%

Cultivation of Chondrus canaliculatus (C. Agardh) Greville (Gigartinales, Rhodophyta) in controlled environments

et al. 2007

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“…On the other hand, the evaluation of Porphyridium sp in diets of 30-week-old White Leghorn laying poultries, the serum cholesterol of the poultries decreased by 28%, the decrease being attributed to the fiber present in the algae, which would be reducing the absorption of cholesterol at the intestinal level (Ginzberg et al, 2000). The seaweed: Gracillaria sp belonging to the group of red algae (Gil-Saavedra 2016) group of Rodophytas (Edding et al, 1987), could also be another alternative to achieve such a decrease in cholesterol in the egg. Few studies have been carried out on the use of this algae with laying hens, one of which is supplementation with 2% flour.…”

Section: Introductionmentioning

confidence: 99%

Inclusion of seaweed Gracilaria sp as a dietary protein alternative in laying hens

Rodríguez-Ríos¹,

Campos²,

Astudillo-Neira³

et al. 2022

JASR

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The recommendations for restricted egg consumption are aimed at the population with hypercholesterolemia, directing research to reduce their cholesterol. The objective was to evaluate the inclusion of red algae: Gracilaria sp. in the diet of laying poultries and its effect on productive variables and concentration of cholesterol in eggs. The alga was cultivated in the Atacama region, Chile, dried in the sun and crushed to be included in the diet. Two hundred 40-weekold laying hens were used, divided into 4 treatments and 5 repetitions, distributed in a randomized block design. The treatments were supplementation with seaweed at 0, 15, 30 and 45%. The following were evaluated: weekly feed intake, egg production, and feed conversion and egg mass were calculated. Cholesterol content was determined in 480 randomly collected eggs per week per repetition and treatment. Data were analyzed with ANOVA and Duncan's test (p<0.05). The treatments of 30 and 45% were suspended at the fifth and fourth week, respectively, due to decreased food consumption and cessation of egg laying. The cholesterol content of the yolk decreased from 23.36 to 17.27 mg g of yolk-1, due to the inclusion of the algae. The inclusion of the alga: Gracilaria sp, decreases the cholesterol level of the egg yolk, but alters the consumption of the poultries.

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“…Agar yields generally decline during summer or during periods of rapid growth (Rotem et al, 1986 ;Christiaen et al ., 1987 ;Edding et al, 1987 ;Friedlander et al ., 1987 ;Penniman & Mathieson, 1987) . According to Christiaen et al (1987) either plant growth or agar deposition will be promoted depending on temperature .…”

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Seasonal growth, density, reproductive phenology and agar quality of Gracilaria sordida (Gracilariales, Rhodophyta) at Mokomoko Inlet, New Zealand

1990

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Growth of mesh-enclosed Gracilaria sordida plants was determined monthly for one year at the Mokomoko mudflat, South Island, New Zealand . Growth of plants with permanent water cover was correlated with water temperature and was most rapid during summer months . Plants exposed at low tide grew only during early spring and late autumn . Bimonthly quadrat sampling of a mudflat population showed that all stages of the life cycle were present throughout the year . Spermatangial plant length and biomass were greatest in early spring ; cystocarpic and tetrasporic plants were greatest in midsummer . Sterile plants were most numerous in the late summer . Agar yield showed little variation either seasonally or between different stages of the life cycle . Agar gel strengths for all life cycle stages were greatest at the time of peak plant size and abundance . Gels from spermatangial plants generally were weaker than those from other stages .

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Culture of Gracilaria sp. in outdoor tanks: productivity

Cited by 5 publications

References 3 publications

Cultivation of Chondrus canaliculatus (C. Agardh) Greville (Gigartinales, Rhodophyta) in controlled environments

Cultivation of Chondrus canaliculatus (C. Agardh) Greville (Gigartinales, Rhodophyta) in controlled environments

Inclusion of seaweed Gracilaria sp as a dietary protein alternative in laying hens

Seasonal growth, density, reproductive phenology and agar quality of Gracilaria sordida (Gracilariales, Rhodophyta) at Mokomoko Inlet, New Zealand

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