scholarly journals Effect of Feed Cycling on Specific Growth Rate, Condition Factor, Body Composition And Rna/Dna Ratio Of Cirrhinus mrigala.

2009 ◽  
Vol 10 (2) ◽  
Author(s):  
F Iqbal ◽  
M Ali ◽  
K Umer ◽  
SA Rana
Keyword(s):  
Growth Rate ◽  
Body Composition ◽  
Specific Growth Rate ◽  
Specific Growth ◽  
Condition Factor ◽  
Rate Condition ◽  
Cirrhinus Mrigala

The Growth of Brown Trout (Salmo Trutta Linn.)

1946 ◽  
Vol 22 (3-4) ◽  
pp. 130-144
Author(s):  
MARGARET E. BROWN
Keyword(s):  
Growth Rate ◽  
Specific Growth Rate ◽  
Rapid Growth ◽  
Salmo Trutta ◽  
Specific Growth ◽  
Condition Factor ◽  
Specific Rate ◽  
Annual Growth Rate ◽  
Size Hierarchy ◽  
Rate Of Growth

1. Two-year-old trout were grown in environments where the following factors were controlled: temperature, amount and intensity of illumination, rate of flow, composition and aeration of the water, quality and quantity of food and amount of living space. 2. The specific growth rate of an individual depended on its size relative to that of the others in the group. It is suggested that subgroups of four or five individuals existed within the size hierarchy and were reorganized at intervals of about 3 months. 3. There was an optimum degree of crowding for rapid growth, and overcrowding led to lower appetite and efficiency of utilization of food, while under-crowded trout ate and grew erratically. 4. In spite of constant environmental conditions, all the fish had an annual growth-rate cycle, with an autumn check, a spring maximum, rapid summer growth and another autumn check, which coincided with maturation of the gonads when they became 3 years old. 5. Individual specific growth rates fluctuated over periods of 4-6 weeks, and rapid growth in length alternated with rapid growth in weight. The specific rate of growth in length was directly proportional to the condition factor. The amount of food eaten, the efficiency of utilization of food and the specific rate of growth in weight varied with the condition factor and were maximal for a factor of about 1·10. 6. The growth-rate fluctuations were exaggerated and the efficiency was greater when the food supply was restricted. At the maintenance level the change in weight was directly proportional to the amount of food eaten. The maintenance requirement decreased, relatively, with increase in body weight. 7. The mean specific growth rate was higher with less than 12 hr. per diem of the standard illumination.

Influence of Sustained Exercise at Two Ration Levels on Growth and Thyroid Function of All-Female Chinook Salmon (Oncorhynchus tshawytscha) in Seawater

1994 ◽  
Vol 51 (9) ◽  
pp. 1975-1984 ◽  
Author(s):  
A. Kiessling ◽  
D. A. Higgs ◽  
B. S. Dosanjh ◽  
J. G. Eales
Keyword(s):  
Growth Rate ◽  
Specific Growth Rate ◽  
Chinook Salmon ◽  
Feed Efficiency ◽  
Oncorhynchus Tshawytscha ◽  
Specific Growth ◽  
Fork Length ◽  
Hepatosomatic Index ◽  
Rate Condition ◽  
Body Protein

Duplicate groups of seawater-adapted 70-g all-female chinook salmon (Oncorhynchus tshawytscha) were held in flowing seawater (24–29‰; 8–12 °C) corresponding to swimming speeds (SS) of 0.5, 1.0, or 1.5 body lengths (bl)/s for 212 d. Fish were fed either a maximum satiating ration of 75% of maximum ration at each SS. Fish grew four- to fivefold during the study, but neither mean body weight, fork length, specific growth rate, condition factor, nor muscle morphometry was influenced by average SS. However, the SS of individually marked fish were negatively correlated with specific growth rate. At both rations, higher SS increased the internal tissue-carcass ratio, hepatosomatic index, and total body protein. More food was ingested at higher SS resulting in reduced feed efficiency. SS did not alter the plasma L-thyroxine (T4) concentration, but increased the plasma 3,5,3′-triiodo-L-thyronine (T3) concentration and T3/T4 ratio. In part, this may reflect the greater food intake at higher SS. The reduced ration depressed all aspects of growth and at 212 d tended to depress both plasma T4 and T3, but did not alter feed efficiency. We conclude that exercise over the range of 0.5–1.5 bl/s does not enhance growth, but reduces feed efficiency in seawater-adapted chinook salmon.

scholarly journals Performance ofClarias gariepinusFed Dried Brewer’s Yeast(Saccharomyces cerevisiae)Slurry in Replacement for Soybean Meal

2017 ◽  
Vol 2017 ◽  
pp. 1-8 ◽  
Author(s):  
Shola Gabriel Solomon ◽  
Gabriel Arome Ataguba ◽  
Gabriel Enemona Itodo
Keyword(s):  
Growth Rate ◽  
Body Composition ◽  
Specific Growth Rate ◽  
Soybean Meal ◽  
Specific Growth ◽  
Conversion Ratio ◽  
Feed Conversion Ratio ◽  
Brewer’S Yeast ◽  
Feed Conversion ◽  
Brewer's Yeast

Following disparity of earlier results, this study tested the performance of African catfishClarias gariepinusfed dried brewer’s yeast slurry meal (DBYM) based diets. Fingerlings ofC. gariepinuswith pooled mean initial weight of1.58±0.01 g were stocked in hapas (1 m × 1 m × 1 m) immersed in an earthen pond at a density of 15 fish per cage. Five diets with increasing substitution of soybean meal with 25%, 50%, 75%, and 100% of dried brewer’s yeast and a control without dried brewer’s yeast (0% substitution) were evaluated for 8 weeks. Palatability of diets reduced with increasing levels of DBYM. Growth and utilization parameters such as weight gain, feed conversion ratio, protein efficiency ratio, and specific growth rate differed significantly (p<0.05) among treated groups. Specific growth rate decreased with increasing substitution while the best feed conversion ratio was obtained in the diet devoid of DBYM. Protein efficiency and utilization decreased with increasing levels of DBYM. Body composition was also affected by inclusion of DBYM with significant differences (p<0.05) being observed across the diets. The trend in body composition follows the utilization of the diets. We conclude that the optimal range of inclusion and substitution of soybean meal with DBYM inC. gariepinusfeed is between 1% and 14% of dry matter.

scholarly journals Chronic Effects of Diazinon® Exposures Using Integrated Biomarker Responses in Freshwater Walking Catfish, Clarias batrachus

2021 ◽  
Vol 11 (22) ◽  
pp. 10902
Author(s):  
Shubhajit Saha ◽  
Azubuike V. Chukwuka ◽  
Dip Mukherjee ◽  
Lipika Patnaik ◽  
Susri Nayak ◽  
...  
Keyword(s):  
Growth Rate ◽  
Specific Growth Rate ◽  
Blood Count ◽  
Specific Growth ◽  
Condition Factor ◽  
Clarias Batrachus ◽  
Total Serum Protein ◽  
Total Serum ◽  
Mean Corpuscular Hemoglobin ◽  
Corpuscular Hemoglobin

Diazinon exposures have been linked to the onset of toxic pathways and adverse outcomes in aquatic species, but the ecological implications on model species are not widely emphasized. The objective of this study was to determine how the organophosphate pesticide diazinon affected hematological (hemoglobin, total red blood count, total white blood count, and mean corpuscular hemoglobin), growth (condition factor, hepatosomatic index, specific growth rate), biochemical (total serum glucose, total serum protein), and endocrine (growth hormone, tri-iodothyronine, and thyroxine) parameters in Clarias batrachus after chronic exposure. Diazinon was administered at predefined exposure doses (0.64 and 1.28 mg/L) and monitored at 15, 30, and 45 days into the investigation. Observation for most biomarkers revealed patterns of decreasing values with increasing toxicant concentration and exposure duration. Correlation analysis highlighted a significant inverse relationship between variables (mean corpuscular hemoglobin, condition factor, specific growth rate, tri-iodothyronine, thyroxine, and total serum protein) and elevated chronic diazinon exposure concentrations. The integrated indices (IBR and BRI) indexes were used to provide visual and understandable depictions of toxicity effects and emphasized the relativity of biomarkers in terms of sensitivity and magnitude or severity of responses under graded toxicant exposures. The significant damage reflected by evaluated parameters in diazinon exposure groups compared to control portends risks to the health of local fish populations, including Clarias batrachus in aquatic systems adjacent to agrarian landscapes.

scholarly journals Body composition, growth performance and enzyme activities of Labeo rohita fed different commercial fish feeds

2023 ◽  
Vol 83 ◽  
Author(s):  
S. Abbas ◽  
Asia Iqbal ◽  
K. M. Anjum ◽  
S. Sherzada ◽  
U. Atique ◽  
...  
Keyword(s):  
Growth Rate ◽  
Body Composition ◽  
Weight Gain ◽  
Specific Growth Rate ◽  
Growth Performance ◽  
Enzyme Activities ◽  
Specific Growth ◽  
Labeo Rohita ◽  
The Body ◽  
Fish Feeds

Abstract We have evaluated the effects of different fish feeds on the body composition, growth, and enzyme activities of Labeo rohita (Rohu). In total, 240 fishes between the average weights of 24.77±2.15g were studied. The treatments were applied in a completely randomized design, with 4 treatments of 60 fishes each. Treatments consisted of four different fish feeds [Oryza (T1), AMG (T2), Aqua (T3), and Supreme (T4)]. Body composition, growth performance, and enzyme activities were evaluated. There was a significant variation in performance of fishes fed with different type of feed; as fishes having Oryza feed showed the highest weight gain, specific growth rate (SGR), and best feed conversion ratio (FCR) as compared to other groups that were considered to be significant (P ≤ 0.05). High net weight gain was obtained in T4 when compared with T2 and T3. FCR value of T4 was less than T1 but higher than T2, T3 and T2, which showed the lowest values. The specific growth rate was recorded as average in T4, but T2 led a high SGR than T3. Similarly, crude protein level and digestive enzymes activity was recorded significantly highest in fed with Oryza (T1) as compared to AMG (T2), Aqua (T3), and Supreme (T4). Water quality parameters were recorded significant in all treatments except pH and DO of treatment (T1), significantly different from other treatments. It was concluded that Rohu (Labeo rohita) could show a promising growth rate and protease enzyme activity when fed with the Oryza feed of 25% protein.

scholarly journals Feed demand behavior in sea bass juveniles: Effects on individual specific growth rate variation and health (inter-individual and inter-group variation)

Aquaculture ◽  
2008 ◽  
Vol 274 (1) ◽  
pp. 87-95 ◽  
Author(s):  
S. Millot ◽  
M.-L. Bégout ◽  
J. Person-Le Ruyet ◽  
G. Breuil ◽  
C. Di-Poï ◽  
...  
Keyword(s):  
Growth Rate ◽  
Specific Growth Rate ◽  
Specific Growth ◽  
Sea Bass ◽  
Rate Variation ◽  
Group Variation

scholarly journals Control of the specific growth rate of Bacillus subtilis for the production of biosurfactant lipopeptides in bioreactors with foam overflow

2010 ◽  
Vol 45 (11) ◽  
pp. 1800-1807 ◽  
Author(s):  
S. Chenikher ◽  
J.S. Guez ◽  
F. Coutte ◽  
M. Pekpe ◽  
P. Jacques ◽  
...  
Keyword(s):  
Growth Rate ◽  
Bacillus Subtilis ◽  
Specific Growth Rate ◽  
Specific Growth
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