03341nam a2200205Ia 4500999001700000003000400017005001700021008004100038082001800079100002400097245007200121260006800193502000800261520253000269700003102799856005702830856011802887942001203005952011803017  c25471d25471OSt20220210161517.0140128s9999    xx            000 0 und d  a639.2bGEE/CO  aGeetha Rani V Mani   aConditions for Oxygen-Packed Transportation of Penaeus Indicus seed  aPanangadbDepartment of Aquaculture, College of Fisheriesc1994  bMSc3 aThe effect of four levels of packing density, (200PL/1, 300PL/1, 400PL/1 and 500PL/1), three levels of salinity (20ppt, 25ppt and 30ppt) and two levels of temperature (30_+ 1°C and 23 + 2°C) on the oxygen consumption rate of Penaeus indicus post-larvae (PL20) was investigated in a closed type respirometer. The dissolved oxygen in the test chamber decreased with	the oxygen consumption of the animals. Oxygen consumption was found to vary with ambient oxygen levels at the different packing densities. Among the three salinities, and two temperatures, the lowest rate of oxygen consumption was recorded at 25ppt and 23 +_ 2°C.
The effect of these factors on the duration and survival of transportation of the shrimp seed in specially designed hard plastic containers fitted with facilities for oxygen packing under uniform pressure (0.2 Kg/cm2) showed that oxygen packing in hypothermal conditions could help in increasing duration and survival. Salinity of 20-25ppt was found to give longer duration of survival. With increase in packing density, there was considerable reduction in the duration and survival of transportation of the seed.

Cannibalism was observed as the major cause of mortality and it could be reduced by 

lowering of temperature. 200PL/1 could be transported with 100% survival within 6.5-8.5h 

at ambient temperature of 30+- 1°C under the afore-mentioned type of oxygen-packing. By 

lowering the temperature to 23 +-_ 2°C it was possible to safely transport with 100% 

survival the same numbers for more than 20h. Corresponding duration at 500PL/1 with 

100% survival was 1-1.5h at ambient temperature and 4-5h at lowered temperature.
To reduce cannibalism at ambient temperatures, hollow plastic translucent habitat material was incorporated into the oxygen-packed jars. This experiment was conducted at 25ppt salinity at different packing densities of 200PL/1, 300PL/1, 400PL/1 and 500PL/1.
Relatively longer duration and higher survival was observed only at higher packing densities of 400PL/1 and 500PL/1 with the introduction of the habitat material.
Water quality parameters in the experimental jars were analysed initially and finally at 70% survival rate. The reduction in dissolved oxygen levels in the oxygen-packed jars was well above the lethal limits even at the highest packing density of 500PL/1 at 70% survival. The decrease in dissolved oxygen levels and increase in ammonia-N and free carbon dioxide, differed with the duration of packing, temperature and packing density.
  aJayasree Vadhyar K (Guide)  uhttps://krishikosh.egranth.ac.in/handle/1/5810154089  uhttps://krishikosh.egranth.ac.in/displaybitstream?handle=1/5810154089&fileid=3648e143-1cb3-4b0e-bd9b-d35e76b35f23  2ddccTH  00102ddc4070aKAUCLVbKAUCLVcTHESESd2014-03-18l0o639.2 GEE/COp170516r2014-03-18 00:00:00w2014-03-18yTH