A Method to Construct Low-Cost Ponds for Aquaculture

A 100 m2 pond was constructed using a vinyl liner supported by hog wire panels shackled together in a circle. The construction was completed in one afternoon at a total cost of $612.00

The Growth of Cultchless Crassostrea virginica Spat at Biloxi Bay, Mississippi Using Different Methods of Culture

Oyster spat produced from the experimental hatchery of the Gulf Coast Research Laboratory at Point Cadet, Biloxi, Mississippi, were grown under a variety of conditions. Recovery of spat planted on adjacent bay bottom was negligible, despite the use of either whole oyster valves, crushed oyster shell or clam shell as a substrate. Negligible growth occurred for spat held in vertical and horizontal water tanks. Growth of spat in horizontal tanks was affected by the density of stocking, with lower densities producing faster growth. Growth in all studies was slower than anticipated and a comparison on growth for spat from a Maryland hatchery with locally-produced spat suggests that the low growth was related to the local waters. Overall, growth as determined by increase in greatest shell dimensions of spat is as follows: on-bottom, 2.90 mm/mo; raft culture., 1.78 mm/mo; upwelling tank, 1.19 mm/mo; and horizontal trough, 2.0 mm/mo

A Method to Construct Low-Cost Ponds for Aquaculture

A 100 m2 pond was constructed using a vinyl liner supported by hog wire panels shackled together in a circle. The construction was completed in one afternoon at a total cost of $612.00

Design and Operation of a Small Tank System for Ovarian Maturation and Spawning of Penaeus vannamei

Ovarian maturation and spawning of Penaeus vannamei was accomplished in a 120 l (30 gal) tank as well as in a 800 l recirculating system consisting of six aquaria plumbed into a common biofilter. Pond reared animals stocked one per tank were fed a diet consisting of commercial pellets, squid, and bloodworms. Temperature was maintained at 28oC and salinity between 28 and 32 ppt. Presence of black shields between aquaria, males, eggs in the water, and other females in the aquaria were not required for ovarian maturation. Thirty-six of 78 females held in the small talk system spawned. The smallest female which spawned was 25.9 g. After unilateral eyestalk ablation by enucleation, female P. vannamei molted in 3-16 days and spawned in 7-20 days. Up to four spawns occurred before the next molt which occurred 15-35 days after ablation

Design and Operation of a Small Tank System for Ovarian Maturation and Spawning of Penaeus vannamei

Ovarian maturation and spawning of Penaeus vannamei was accomplished in a 120 l (30 gal) tank as well as in a 800 l recirculating system consisting of six aquaria plumbed into a common biofilter. Pond reared animals stocked one per tank were fed a diet consisting of commercial pellets, squid, and bloodworms. Temperature was maintained at 28oC and salinity between 28 and 32 ppt. Presence of black shields between aquaria, males, eggs in the water, and other females in the aquaria were not required for ovarian maturation. Thirty-six of 78 females held in the small talk system spawned. The smallest female which spawned was 25.9 g. After unilateral eyestalk ablation by enucleation, female P. vannamei molted in 3-16 days and spawned in 7-20 days. Up to four spawns occurred before the next molt which occurred 15-35 days after ablation

A Study of Factors Influencing the Hatch Rate of Penaeus vannamei Eggs. II. Presence of a Spermatophore

Eghty-three mated Penaeus vannamei females were sourced from a commercial sized maturation tank. The hatch rate was recorded for those shrimp based on the presence of a full spermatophore, a partial spermatophore or the loss of the spermatophore during sourcing and handling. The hatch rates were not significantly different among females for the three spermatophore conditions. The mean hatch rates were 48.8% for full spermatophores, 43.1% for partial spermatophores and 55.6% for lost spermatophores. The location of the sperm at fertilization and the precise mechanisms of fertilization are still unknown

The Effect of Salinity on Spawning Frequency of Penaeus setiferus in Aquaria

Penaeus setiferus were matured and spawned in a small 120L tank system in the absence of males. No significant differences in the number of shrimp that spawned or the time required to spawn were detected for shrimp held at salinities of 20, 25 or 30 ppt in either natural or artificial seawater. The earliest that spawning occurred was an average of 17 days past ablation and as late as 28 days past ablation. None of the shrimp held in artificial seawater at 20 and 25 ppt spawned in the same molt cycle in which they were ablated, while one third of the shrimp held in natural seawater did

Variability in Growth of Postlarval Penaeus vannamei

This note reports the average size of Penaeus vannamei postlarvae held under a variety of conditions for approximately 30 days. Fifteen separate and independent rearing trials were completed over several seasons. Extreme growth variations were noted, with significant differences existing in eight of the 26 replicates. Significant differences were noted for treatments in seven of the 12 studies. Shrimp ranged in size from an average of 0.01 to 3.08 g after a month of culture

Maturation of Penaeus vannamei Based Upon a Survey

Captive maturation and reproduction of Penaeus vannamei, a popularly cultured penaeid shrimp, was first achieved in 1977. Based upon interviews of 18 facility managers, average conditions are as follows: tank diameter of 4.6 m (15 ft), 100% water exchange with recirculation, temperature 27-29°C. salinity 28-32 ppt, and a photoperiod of 13-14 hours of light. Broodstock are predominately wild, undergo unilateral eyestalk ablation by enuculation, and are stocked at five per square meter with a 1:1 sex ratio. Penaeus vannamei at most facilities are fed squid, pellets and bloodworms four times daily and 3-7% of the females are found to be mated per night and 50% of the eggs are expected to hatch. Most facility managers anticipate some misplaced and some melanization of smmataphores

Maturation of Penaeus vannamei Based Upon a Survey

Captive maturation and reproduction of Penaeus vannamei, a popularly cultured penaeid shrimp, was first achieved in 1977. Based upon interviews of 18 facility managers, average conditions are as follows: tank diameter of 4.6 m (15 ft), 100% water exchange with recirculation, temperature 27-29°C. salinity 28-32 ppt, and a photoperiod of 13-14 hours of light. Broodstock are predominately wild, undergo unilateral eyestalk ablation by enuculation, and are stocked at five per square meter with a 1:1 sex ratio. Penaeus vannamei at most facilities are fed squid, pellets and bloodworms four times daily and 3-7% of the females are found to be mated per night and 50% of the eggs are expected to hatch. Most facility managers anticipate some misplaced and some melanization of smmataphores