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A Study Of Factors Influencing The Hatch Rate Of Penaeus Vannamei Eggs. Iii. Presence Of The Female After Spawning, John T. Ogle, Kathleen A. Beaugez
A Study Of Factors Influencing The Hatch Rate Of Penaeus Vannamei Eggs. Iii. Presence Of The Female After Spawning, John T. Ogle, Kathleen A. Beaugez
Gulf and Caribbean Research
A comparison was made of the hatch rate (percent hatch) of Penaeus vannamei eggs. The study was comprised of 100 spawns from mated Penaeus vannamei females. In,one treatment, 50 female shrimp were removed from the isolation spawning tanks after spawning occurred but prior to hatching of eggs, producing 49.7% mean hatch rate. In the other treatment, 50 female shrimp were left in the tanks until after the eggs had hatched, producing an average hatch rate of 35.0%. A significant difference in the hatch rates of eggs was observed between spawns with and without presence of the female at time of …
A Study Of Factors Influencing The Hatch Rate Of Penaeus Vannamei Eggs. I. Effects Of Size, Shape And Volume Of The Spawning Tank, John T. Ogle
Gulf and Caribbean Research
The hatch rate of Penaeus vannamei eggs spawned by individual females in square and round tanks and in different volumes of seawater was determined. The mean hatch rates ranged from 17.3% to 64.9% and were not significantly different for volumes of 50, 100 and 200 L nor for square or round tanks of equal water volumes. Hatch rate was significantly affected by the size of the spawning tank.
A Study Of Factors Influencing The Hatch Rate Of Penaeus Vannamei Eggs. Ii. Presence Of A Spermatophore, John T. Ogle
A Study Of Factors Influencing The Hatch Rate Of Penaeus Vannamei Eggs. Ii. Presence Of A Spermatophore, John T. Ogle
Gulf and Caribbean Research
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.
Closed System Culture Of Penaeus Vannamei, John T. Ogle, Jeffrey M. Lotz
Closed System Culture Of Penaeus Vannamei, John T. Ogle, Jeffrey M. Lotz
Gulf and Caribbean Research
Penaeus vannamei were cultured utilizing three different closed recirculating seawater systems. The first system used biological filtration for water treatment. The second system utilized both physical and chemical filtration, but no biological filtration. The third system used a combination of biological, physical, and chemical filtration. Shrimp growth was monitored for a 12-week period for each system. Shrimp from the biological filtration system had a growth rate of 0.82 g/wk and an overall survival rate of 45.6%. Shrimp from the closed system which used physical and chemical filtration had a growth rate of 0.99 g/wk and a survival rate of 29.2%. …
Effects Of Salinity On Survival And Growth Of Postlarval Penaeus Vannamei, John T. Ogle, Kathy Beaugez, Jeffrey M. Lotz
Effects Of Salinity On Survival And Growth Of Postlarval Penaeus Vannamei, John T. Ogle, Kathy Beaugez, Jeffrey M. Lotz
Gulf and Caribbean Research
Eight and 22-day-old Penaeus vannamei postlarvae were exposed to several salinities for 24 hours and 120 hours by direct transfer from 32 ppt salinity to lower salinity waters. The challenge study included six experiments conducted on 8-day-old postlarvae (PL-8) and five experiments conducted on 22-day-old postlarvae (PL-22). Each experiment consisted of ten replicates of ten animals each. Shrimp were held in 1 L plastic containers with 500-ml of seawater. Lowered salinity resulted in lower survival for shrimp of both ages. Longer exposure time resulted in lower survival for shrimp of both ages. Younger shrimp exhibited lower survival than older shrimp. …
Variability In Growth Of Postlarval Penaeus Vannamei, John T. Ogle
Variability In Growth Of Postlarval Penaeus Vannamei, John T. Ogle
Gulf and Caribbean Research
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.
Food Preference Of Penaeus Vannamei, John T. Ogle, Kathy Beaugez
Food Preference Of Penaeus Vannamei, John T. Ogle, Kathy Beaugez
Gulf and Caribbean Research
The preference of Penaeus vannamei for 15 food items used in maturation was determined. The foods in order of preference were ranked as follows: Artemia, krill, Maine bloodworms, oysters, sandworms, anchovies, Panama bloodworms, Nippai maturation pellets, Shigueno maturation pellets, conch, squid, Salmon-Frippak maturation pellets, Rangen maturation pellets and Argent maturation pellets.
Design And Operation Of A Small Tank System For Ovarian Maturation And Spawning Of Penaeus Vannamei, John T. Ogle
Design And Operation Of A Small Tank System For Ovarian Maturation And Spawning Of Penaeus Vannamei, John T. Ogle
Gulf and Caribbean Research
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. …
Maturation Of Penaeus Vannamei Based Upon A Survey, John T. Ogle
Maturation Of Penaeus Vannamei Based Upon A Survey, John T. Ogle
Gulf and Caribbean Research
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 …