排序方式： 共有8条查询结果，搜索用时 15 毫秒
1
1.
Using Experimental Microcosms in Shrimp Research: The Growth-Enhancing Effect of Shrimp Pond Water 总被引：2，自引：0，他引：2
After preliminary six week experiments showed that shrimp pond effluent from an intensive culture growout pond had the capacity to nearly double shrimp growth in laboratory tanks, an 18 day experiment was designed to determine if similar results occurred in the presence of high quality feeds. The results presented here corroborate the hypothesis that autochthonous factors in shrimp pond water stimulate shrimp growth. These results revealed that performance of currently available shrimp feeds is greatly improved in the presence of pond effluent, regardless of feed quality. Increased feed performance did not appear to be an artifact of supplemental feed availability in pond effluent. The implications from these experiments are that, even in intensive culture systems (above 40 shrimp per m2 ), in-situ sources of nutrition play an important role in shrimp growth. 相似文献
2.
The growth of a temperate and a tropical strain of Isochrysis was studied at four temperatures and three light intensity levels. All algal cultures were grown in an enriched artificial seawater medium under constant illumination and were bubbled with air enriched with 0.1% CO2. Culture density (cells/ml) was measured periodically during exponential growth. Average growth rates for each combination of temperature and light intensity are presented as doublings/day. Observations of growth under the various culture conditions indicate that T-ISO (tropical strain) grows rapidly over a much broader range of temperatures than does I. galbana. Variations in growth at different light intensity levels suggest that the optimum light level increases as a function of temperature for T-ISO and that the growth of I. galbana is inhibited by high levels of light (1500 μW/cm2). The relative value of both strains as food for larval and juvenile oysters and the advantages and limitations of large scale culture are discussed. 相似文献
3.
Charles E. Epifanio Richard Srna Gary Pruder 《Aquaculture (Amsterdam, Netherlands)》1975,5(3):227-241
This paper seeks to define biological specifications for the design of highly controlled cultural systems for oysters and hard clams. Much of the biological information necessary for design either is not available in the literature or is available only in an inferential manner. Particularly lacking are equations describing relationships between size of the animals and their various physiological processes. Equations that estimate some of these relationships are presented, and safe levels of several water quality variables are defined. 相似文献
4.
Indigenous pond biota contribute to the nutrition of shrimp grown in semi-intensive and extensive earthen ponds. Penaeus vannomei ingesta was used to assess the nutritional contribution of pond biota and applied feed in model 225 m2 nominally managed earthen ponds. Biochemical analyses were also performed on representative pond biota and pond environment samples. Average dry matter shrimp ingesta composition ( N = 64) was: available carbohydrate, 4.2%± 1.8%; lipid, 4.8%± 2.3%; available protein, 9.6%± l.0%; carbon, 9.6%± 1.0%; nitrogen, 5.9%± 2.9%. Ingesta carbon decreased from 27.0%± 3.9% on week 2 to 16.3%± 3.3% on week 8, and nitrogen content decreased from 9.5%± 4.3% to 3.6%± 0.8% during the same interval. The decrease of ingesta C:N ratio from weeks 2 to 8 may indicate changing nutritional requirements of the shrimp. Ingesta essential amino acids varied by less than 10% from short-neck clam protein. Except for several samples which were low in arginine, pond biota and environment samples contained amino acid profiles which were close to short-neck clam. Essential fatty acid composition of shrimp ingesta was highly variable. Ingesta 22:6 fatty acid was present in populations of shrimp from ponds experiencing the highest weekly growth rates. Ingesta 22:6 fatty acid was not present in measurable amounts in shrimp experiencing the lowest growth. The unsaturated fatty acids 20:5 and 22:6 were absent from some pond biota and environment samples and abundant in others. The applied diet contained no measurable 20:5 or 22:6. The management implications of shrimp ingesta biochemical analyses are that diets may be fed which nutritionally complement pond biota consumed by the shrimp. 相似文献
5.
James A. Wyban Gary D. Pruder Kenneth M. Leber L. Burzell 《Journal of the World Aquaculture Society》1989,20(1):18-23
The effects of continuous paddlewheel operation on shrimp growth, yield and crop value were studied in Hawaii. Six 0.4 ha earthen ponds were stocked with Penaeus vannamei at 25 postlarvae/m2 . Three ponds served as controls with no mechanical aeration or mixing. Each of the other three ponds had two 1 hp paddlewheel aerators (3.7 kw/ha) running continuously throughout the five month trial (29 April-8 October 1986). All other management factors were applied uniformly.
Daily water temperature and use were significantly different between treatments. Paddlewheel ponds had lower water temperatures (28.3 vs. 28.5 C) and lower water use (0.8% exchange per day vs. 2.2% exchange per day) than control ponds.
Faster shrimp growth in paddlewheel ponds was evident in week 8. At week 14, mean shrimp body weights and growth rates were significantly greater. Shrimp at harvest were 21.2 ± 2.6 g in paddlewheel ponds versus 15.3 ± 2.6 g in control ponds. Mean shrimp production was 2,852 ± 222 kg/ha in paddlewheel ponds compared to only 2,061 ± 558 kg/ha in controls. Mean crop value was $13,719 per pond per crop for paddlewheel ponds versus $9,111 for control ponds. Hence, paddlewheels afforded an increase of 42% in net crop value after subtracting purchase and operating costs. 相似文献
Daily water temperature and use were significantly different between treatments. Paddlewheel ponds had lower water temperatures (28.3 vs. 28.5 C) and lower water use (0.8% exchange per day vs. 2.2% exchange per day) than control ponds.
Faster shrimp growth in paddlewheel ponds was evident in week 8. At week 14, mean shrimp body weights and growth rates were significantly greater. Shrimp at harvest were 21.2 ± 2.6 g in paddlewheel ponds versus 15.3 ± 2.6 g in control ponds. Mean shrimp production was 2,852 ± 222 kg/ha in paddlewheel ponds compared to only 2,061 ± 558 kg/ha in controls. Mean crop value was $13,719 per pond per crop for paddlewheel ponds versus $9,111 for control ponds. Hence, paddlewheels afforded an increase of 42% in net crop value after subtracting purchase and operating costs. 相似文献
6.
Greg S. Jakob Gary D. Pruder Jaw-Kai Wang 《Journal of the World Aquaculture Society》1993,24(3):344-351
This study was conducted to quantify the potential of Crassostrea virginica biculture using marine shrimp pond water. It was envisioned that this biculhre could avoid cost and reliability problems associated with the mass production of algae as oyster feed. Such problems contributed to the failure of previous attempts to commercialize oyster culture.
Oysters were reared in each of two flow through 310 L tanks receiving shrimp pond water from selected commercial semi-intensive shrimp ponds. In each tank, pond water was delivered to the upper trays and flowed downward through each of two seven tray stacks. For both tanks, mean oyster growth rate (2 g/wk) and survival (79%) from seed (0.04 g) to market size (55.0 g) compared favorably with previous reports and for the first time approximated the growth projected in a 1968 engineering study by American Cyanamid (Calbo et al. 1968).
Oyster growth within and between tanks indicated a relationship between biomass and exchange rates. During a 65 d controlled monitoring period mean oyster growth rates of 3.7 g/wk were achieved in upper trays of both tanks. Data are provided to estimate optimum pond water flow rate and oyster biomass relationships. The prospects for shrimp and bivalve co-culture appear promising. 相似文献
Oysters were reared in each of two flow through 310 L tanks receiving shrimp pond water from selected commercial semi-intensive shrimp ponds. In each tank, pond water was delivered to the upper trays and flowed downward through each of two seven tray stacks. For both tanks, mean oyster growth rate (2 g/wk) and survival (79%) from seed (0.04 g) to market size (55.0 g) compared favorably with previous reports and for the first time approximated the growth projected in a 1968 engineering study by American Cyanamid (Calbo et al. 1968).
Oyster growth within and between tanks indicated a relationship between biomass and exchange rates. During a 65 d controlled monitoring period mean oyster growth rates of 3.7 g/wk were achieved in upper trays of both tanks. Data are provided to estimate optimum pond water flow rate and oyster biomass relationships. The prospects for shrimp and bivalve co-culture appear promising. 相似文献
7.
8.
1