PDF | The state of Nayarit is the main oyster producer in the Mexican Pacific, this derived from artisanal crops of Crassostrea corteziensis and. ABSTRACT. The state of Nayarit is the main oyster producer in the Mexican Pacific, this derived from artisanal crops of Crassostrea corteziensis and collecting of. Media. Map of Crassostrea corteziensis. Crassostrea corteziensis Trusted. Creative Commons Attribution Non Commercial Share Alike (CC BY-NC-SA

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Scope for growth of juvenile Cortez oyster, Crassostrea corteziensis fed isocaloric diets prepared with microalgae and cereal flours.

Consumed energy, absorbed energy, and SFG decreased with a corresponding decrease in the proportion of live microalgae in the diet. Oysters fed the microalgal diet showed significantly increased physiological activity in all parameters except absorption efficiency. These results suggest that cereals can be used corteziensos complementary food or C. Crassostrea corteziensis, energy balance, oyster nutrition, microalgae, cornstarch, wheat flour.

Severe increases in die-offs of cultivated Pacific oyster, Crassostrea gigas during the last decade Trabal et al. Partial replacement of microalgae by dry feedstuffs in the diet of juvenile oysters has been studied as a means to propose reduc tions in coreziensis cost of laboratory nursery culture. While most of these products have given satisfactory results in rearing marine bivalves, only a few have allowed replacing a large part of the algal proportion without affecting the nutritional balance of the diet or the condition of the animals.

The physiological index Scope for Growth SFG determines the energy potentially available for growth and reproduction Winberg, and is calculated as the difference between absorbed energy and respired and excreted energy. SFG has been used in marine bivalves to determine, for example, physiological plasticity of native and invasive species Sara et al.

We investigated the consumed, absorbed, and respired energy, the absorption efficiency, and calculated SFG in juvenile Cortez oysters fed nine isocaloric diets prepared with a mixture of microalgae Tisochrysis lutea, Chaetoceros calcitrans and Ch. A total of 15, three-week old C. Crasostrea microalgae constituting the basis of diet 1 control were: Tisochrysis lutea, Chaetoceros calcitrans and C.

The caloric content of the three microalgae and both cereal products cornstarch and wheat flour used to prepare the control diet is shown in Table 2. Caloric content was determined with a Parr calorimetric pump. Energy content of food particles was slightly higher for the two cereal products than for microalgae Table 2and diets containing higher proportion of cereals crassoztrea a lower particle density to meet the energy required.

Dry weight and energy content of the food particles used to prepare the experimental diets fed to juveniles of the Cortez oyster Crassostrea corteziensis. The density of food particles in each diet never exceededparticles mL -1 to prevent pseudo-feces formation.


Microalgae were cultured in 0. The resulting mixture was weighed and poured into 5 Cortwziensis boiling filtered freshwater and then gently stirred for 5 min to ensure a complete and homogeneous cooking. Three containers holding ca. After 30 days, Scope for Growth SFG was determined using a continuous flow-through system consisting of three 1. The experimental chambers received continuously 70 mL min -1 seawater with food of one experimental diet at a time.

SFG was measured Winberg, by subtracting respiration and excretion energy from absorbed energy. A detailed description of the methods and formulae was described in a previous article Nieves-Soto et al.

To detect significant differences, one-way ANOVA, followed by Tukey post-hoc analysis of means, was run between experimental diets. Significant differences were observed in most physiological parameters in oysters fed the experimental diets Table 3.

As a general pattern, consumed energy Cabsorbed energy Aand SFG decreased with a corresponding decrease in the proportion of live microalgae in the diet. Oysters fed the control diet live microalgae showed significantly increased physiological activity in all parameters except absorption efficiency e Table 3. Therefore, crzssostrea fed these four diets showed negative SFG Table 3. The lowest e was observed in oysters fed diet 1 Respired energy did not show a clear relationship to the composition of the diets and ranged from Excreted energy was negligible and was removed from the calculation of SFG.

The Cortez oyster showed the highest SFG when fed the diet containing no cereal meals. These results are consistent with observations on other bivalve species including the Cortez oyster. The poor growth shown cortezirnsis bivalves fed drystuffs is likely due to the low consumed energy derived likely from reduced ingestion.

Although e increased when microalgae were replaced with dry ingredients, the consumed energy was not enough to meet respiration energy. The high e recorded in oysters fed diets containing cornstarch or wheat flour may have been due to the easier digestibility of carbohydrates contained in these dry feedstuffs compared to the more complex structures and biochemical content of live microalgae, especially the two diatom species that have thick silicate walls.

However, despite this increase in e, oysters did not consume enough crassosstrea C to satisfy their needs.

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The nutritional value of a mixed diet depends on nutrient composition, digestibility, and palatability Garr et al.

This means that oysters consumed a low number of food particles. This reduced ingestion may be related to the physical properties of the cereal particles, such as size, surface, crassostgea palatability.

Absorption efficiency has been shown to vary widely depending on the species and habitat. Cockles for example, can modify the digestive process corteeziensis maintain a fairly constant e Ibarrola et al. The maximum SFG In conclusion, the best diet for Cortez oyster spat production was the mixture of live microalgae.


Growth of the oyster Crassostrea corteziensis Hertlein, in Sonora, Mexico.

Prospective culture of the Cortez oyster Crassostrea corteziensis from northwestern Mexico: The use of algal substitutes and the requirement for live algae in the hatchery and nursery rearing of bivalve mollusks: Changes in the scope for growth of blood cockles Anadara granosa exposed to industrial discharge.

Effect of microalgal diets and commercial wheat germ flours on the lipid profile of Ruditapes decussates spat. Short-term adaptation of digestive crassostrra in the cockle Cerastoderma edule exposed to different food quality and quantity. Comparative feeding and physiological energetics of diploid and triploid Sydney rock oysters, Saccostrea commercialis I.

Effects of oyster size. Comparative feeding and physiological energetics in diploid and triploid Sydney rock oysters Saccostrea commercialis. Influences of food concentration and tissue energy distribution.

WoRMS – World Register of Marine Species – Crassostrea corteziensis (Hertlein, )

A review of the nutritional requirements of bivalves and the development of alternative and artificial diets for bivalve aquaculture. Combined effects of diet and stocking density on growth and biochemical composition of spat of the Cortez oyster Crassostrea corteziensis at the hatchery.

Influence of hatchery diets on early grow-out of the Cortez oyster Crassostrea corteziensis in Sinaloa, Mexico. Is the mangrove cockle Anadara tuberculosa a candidate for effluent crassostdea Energy budgets under combined conditions of temperature and salinity.

Effect of microalgal and inert diets on the growth performance and biochemical composition of Ruditapes decussatus seed: The effect of microalgal diets on growth, biochemical composition, and fatty acid profile of Crassostrea corteziensis Hertlein juveniles.

Variation of the physiological energetics of the bivalve Spisula subtruncata da Costa, within an annual cycle. Effect of salinity and temperature on feeding physiology and scope for growth of an invasive species Brachidontes pharaonis -Mollusca: Bivalvia within the Mediterranean Sea.

Effect of increasing salinity on physiological response in juvenile scallops Argopecten purpuratus at two cprteziensis temperatures. Molecular analysis of bacterial microbiota associated with oysters Crassostrea gigas and Crassostrea corteziensis in different growth phases at two cultivation sites. Energetic physiology cortezkensis the Caribbean scallops Argopecten nucleus and Nodipecten nodosus fed with different microalgal diets.

Rate metabolism and food requirements of crassostreaa. Comparative effects of microalgal species and food concentration on suspension feeding and energy budgets of the pearl oysters Pinctada margaritifera and P. Comparative effects of temperature craxsostrea suspension feeding and energy budgets of the pearl oysters, Pinctada margaritifera and P.