scholarly journals Growth of Spiny Lobster Panulirus homarus Fed with Moist Diet

2018 ◽  
Vol 3 (2) ◽  
pp. 95
Author(s):  
Asep Ridwanudin ◽  
Varian Fahmi ◽  
Idham Sumarto Pratama
Keyword(s):  
Oxygen Consumption ◽  
Dissolved Oxygen ◽  
Spiny Lobster ◽  
Growth And Survival ◽  
Oxygen Levels ◽  
Hypoxic Conditions ◽  
National University ◽  
Oxygen Conditions ◽  
Measure Oxygen Consumption

Oxygen is a vital parameter in aquaculture activities. The decrease of dissolved oxygen levels in aquaculture media should be highly observed, since very low dissolved oxygen conditions (hypoxia) could negatively affect to the growth and survival of fish. Therefore, research on the condition of hypoxia is very important to be studied. This study was conducted in January-February 2013 at the Laboratorium of Fish Reproductive Physiology, Pukyong National University, South Korea to measure oxygen consumption in tilapia Oreochromis niloticus (total length: 14.2 ± 1.4 cm, weight: 31.3 ± 2.0 g) under normal conditions (normoxia) and hypoxia. Measurement was conducted using respirometer (dimension: 20 × 17,5 × 10 cm; volume: 3,5 L) every 10 minutes during four hours of observation. Experiment was conducted with three replications. The results showed that oxygen consumption of tilapia fingerlings in hypoxia conditions (12.09 ± 3.20 mg O2/kg/h) was lower than normoxia (35.67 ± 4.19 mg O2/kg/h) (P<0.01). Continuous hypoxic conditions could negatively affect fish movements, which could ultimately lead to mortality when dissolved oxygen levels are very low. Meanwhile, the results on determination of critical oxygen levels for tilapia showed a dissolved oxygen range of 1.9 ± 0.5 mg/L

scholarly journals Effects of Hypoxia on Oxygen Consumption of Tilapia Fingerlings (Oreochromis niloticus)

2018 ◽  
Vol 3 (2) ◽  
pp. 165
Author(s):  
Vitas Atmadi Prakoso ◽  
Young Jin Chang
Keyword(s):  
Oxygen Consumption ◽  
Dissolved Oxygen ◽  
Oreochromis Niloticus ◽  
Growth And Survival ◽  
Oxygen Levels ◽  
Hypoxic Conditions ◽  
National University ◽  
Oxygen Conditions ◽  
Measure Oxygen Consumption

Oxygen is a vital parameter in aquaculture activities. The decrease of dissolved oxygen levels in aquaculture media should be highly observed, since very low dissolved oxygen conditions (hypoxia) could negatively affect to the growth and survival of fish. Therefore, research on the condition of hypoxia is very important to be studied. This study was conducted in January-February 2013 at the Laboratorium of Fish Reproductive Physiology, Pukyong National University, South Korea to measure oxygen consumption in tilapia <em>Oreochromis niloticus</em> (total length: 14.2 ± 1.4 cm, weight: 31.3 ± 2.0 g) under normal conditions (normoxia) and hypoxia. Measurement was conducted using respirometer (dimension: 20 × 17,5 × 10 cm; volume: 3,5 L) every 10 minutes during four hours of observation. Experiment was conducted with three replications. The results showed that oxygen consumption of tilapia fingerlings in hypoxia conditions (12.09 ± 3.20 mg O<sub>2</sub>/kg/h) was lower than normoxia (35.67 ± 4.19 mg O<sub>2</sub>/kg/h) (P&lt;0.01). Continuous hypoxic conditions could negatively affect fish movements, which could ultimately lead to mortality when dissolved oxygen levels are very low. Meanwhile, the results on determination of critical oxygen levels for tilapia showed a dissolved oxygen range of 1.9 ± 0.5 mg/L.

scholarly journals Ion fluxes in silver catfish (Rhamdia quelen) juveniles exposed to different dissolved oxygen levels

2006 ◽  
Vol 4 (4) ◽  
pp. 435-440 ◽  
Author(s):  
Felipe Link de Rosso ◽  
Keidi C. S. Bolner ◽  
Bernardo Baldisserotto
Keyword(s):  
Organic Matter ◽  
Oxygen Consumption ◽  
Dissolved Oxygen ◽  
Ammonia Excretion ◽  
Ion Fluxes ◽  
Phytoplankton Blooms ◽  
Silver Catfish ◽  
Oxygen Levels ◽  
Rhamdia Quelen ◽  
Series Of Experiments

Low dissolved oxygen levels in the water (hypoxia) can be provoked by oxygen consumption by fish and other organisms, organic matter decomposition, phytoplankton blooms, and temperature increase. The objective of the present study was to investigate Na+, Cl-, K+, and ammonia fluxes in silver catfish (Rhamdia quelen) exposed to different dissolved oxygen levels. Juveniles (9 ± 1g) maintained at 6.0 mg.L-1 dissolved oxygen were transferred to four 40 L aquaria with different dissolved oxygen levels (in mg.L-1): 6.0, 4.5, 3.5, and 2.5. In another series of experiments, juveniles were acclimated at 6.0 or 2.5 mg.L-1 dissolved oxygen levels, and then placed in two 40 L aquaria with 6.0 mg.L-1 dissolved oxygen. For both series of experiments, 1, 24, 48 or 120 h after transference juveniles were placed in individual chambers of 200 mL (with the same dissolved oxygen levels of their respective aquaria) for 3 h. Water samples were collected for analysis of Na+, Cl-, K+, and ammonia levels. The obtained results allow concluding that exposure to 2.5 mg.L-1 dissolved oxygen levels promotes loss of ions and lower ammonia excretion in silver catfish juveniles, but these losses are rapidly stabilized for Na+ and Cl-. Exposure to less hypoxic levels also changes ion fluxes and ammonia excretion, but there is no clear relationship between both parameters in this species. Therefore, silver catfish osmoregulation seems to be affected when this species is transferred from normoxic to hypoxic waters and vice-versa.

Some Effects of Temporary Exposure to Low Dissolved Oxygen Levels on Pacific Salmon Eggs

1958 ◽  
Vol 15 (2) ◽  
pp. 229-250 ◽  
Author(s):  
D. F. Alderdice ◽  
W. P. Wickett ◽  
J. R. Brett
Keyword(s):  
Oxygen Consumption ◽  
Dissolved Oxygen ◽  
Oxygen Demand ◽  
Oxygen Availability ◽  
Oncorhynchus Keta ◽  
Hatching Rate ◽  
Oxygen Level ◽  
Low Oxygen ◽  
Low Dissolved Oxygen ◽  
Oxygen Levels

Eggs of the chum salmon (Oncorhynchus keta) were exposed to various constant levels of dissolved oxygen for a period of seven days. The procedure was repeated with fresh egg samples at various developmental stages. Temperatures were constant at 10 °C. from fertilization to hatching. Estimates of oxygen consumption uninhibited by low dissolved oxygen levels were obtained at various stages of egg development for whole eggs and also on the basis of the weight of larvae, excluding the yolk. Eggs were most sensitive to hypoxia between 100–200 Centigrade degree-days and compensated for reduced oxygen availability by reducing the oxygen demand and rate of development. Very low oxygen levels at early incubation stages resulted in the production of monstrosities. At about the time the circulatory system becomes functional the compensatory reduction in rate of growth under hypoxial conditions is reduced, but eggs no longer survive extreme hypoxial conditions. Eggs subjected to low dissolved oxygen levels just prior to hatching hatch prematurely at a rate dependent on the degree of hypoxia. The maximum premature hatching rate corresponded approximately with the median lethal oxygen level. Estimated median lethal levels rose slowly from fertilization to hatching. Oxygen consumption per egg rose from fertilization to hatching while the consumption per gram of larval tissue declined from a high to a low level at about the time of blastopore closure. Subsequently, a slight rise in the rate occurred up to a level which was more or less constant to hatching. "Critical" dissolved oxygen levels were calculated and they appear to define the oxygen level above which respiratory rate is unmodified by oxygen availability. Critical levels ranged from about 1 p.p.m. in early stages to over 7 p.p.m. shortly before hatching.

Feasibility of Snow Clearing to Improve Dissolved Oxygen Conditions in a Winterkill Lake

1983 ◽  
Vol 40 (9) ◽  
pp. 1526-1531 ◽  
Author(s):  
J. Barica ◽  
J. Gibson ◽  
W. Howard
Keyword(s):  
Oxygen Uptake ◽  
Dissolved Oxygen ◽  
Lake Area ◽  
Experimental Plot ◽  
Snow Removal ◽  
Oxygen Levels ◽  
Oxygen Conditions ◽  
Rock Lake ◽  
Expected Increase

Although periodic mechanical snow removal from the surface of an experimental plot on Rock Lake, southern Manitoba, between January and February, did not provide an expected increase of dissolved oxygen levels that would reduce the likelihood of fish winterkill in the localized area of the lake, it provided a basis for analyzing the practicality and feasibility of the method. The minimum lake area to be kept clear of snow for prevention of winterkill was calculated to be 15% of the total lake area. Snow clearing should start soon after freeze-up to provide at least 0.3 g∙m−2 d−1 dissolved oxygen needed to compensate for bacterial oxygen uptake during the winter months.

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