Specific growth rate and proximate body composition of Atlantic cod (Gadus morhua L.)

Abstract Nephrops was found to be of low quality as food for cod. In a laboratory experiment the mean specific growth rate of 1 kg cod was 0.184 and 0.415% d−1 when fed to satiation on Nephrops and capelin, respectively. This large difference in growth rate resulted not only from less intake of Nephrops (1.19 kg cod−1) than capelin (1.55 kg cod−1) but also because more Nephrops (4.6 kg) than capelin (2.2 kg) were required to produce each kilogramme of cod. Higher food conversion ratio was consistent with lower fat content of Nephrops (1.3%) than capelin (9.2%) but the exoskeleton also reduced the digestion rate of Nephrops. In the groups where Nephrops and capelin of equal mean weight were offered simultaneously, 40% of the diet consisted of Nephrops during the first week and 10% during the final seven weeks of the experiment. At the end of the experiment, condition factor, liver index, and gonadosomatic index were significantly lower for cod fed on Nephrops (0.967, 5.7, 7.1, respectively) than for those fed on capelin (1.086, 15.8, 11.2, respectively). These results suggests that predation by cod on Nephrops might be reduced by regular release of capelin or other similar food in the distributional areas of Nephrops.

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Size composition and production characteristics of atlantic cod and pollock juveniles of the Zelenetskaya Bay (Eastern Murman) in 2018

Transaction Kola Science Cetnre ◽

10.37614/2307-5252.2021.3.9.002 ◽

2021 ◽

Vol 12 (3-2021) ◽

pp. 13-19

Author(s):

O.V. Bondarev ◽

Keyword(s):

Growth Rate ◽

Gadus Morhua ◽

Specific Growth ◽

Atlantic Cod ◽

Size Composition ◽

Specific Weight ◽

Specific Production ◽

Summer Period ◽

Weight Growth ◽

Production Characteristics

In this article presented data on the growth of the atlantic cod Gadus morhua Linnaeus, 1758 and pollock Pollachius virens (Linnaeus, 1758) juveniles in Zelenetskaya Bay in 2018. The daily specific growth rate and production rate were calculated. The length of atlantic cod juveniles in July–September varied from 3.5 to 7.9 cm, and pollock – from 2.5 to 9.4 cm. The daily specific weight growth rate (qw) of atlantic cod juveniles in Zelenetskaya Bay from July to August was 0.41, and from August to September – 1.08; for pollock juveniles, these indicators are 1.32 and 0.94, respectively. The daily specific production (C) of atlantic cod juveniles in Zelenetskaya Bay over the summer period varied from 0.015 to 0.036, and of pollock juveniles – from 0.011 to 0.042.

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

Journal of Nutrition and Metabolism ◽

10.1155/2017/8936060 ◽

2017 ◽

Vol 2017 ◽

pp. 1-8 ◽

Cited By ~ 2

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.

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

Journal of Applied Sciences and Environmental Management ◽

10.4314/jasem.v10i2.43692 ◽

2009 ◽

Vol 10 (2) ◽

Cited By ~ 1

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

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

Brazilian Journal of Biology ◽

10.1590/1519-6984.250402 ◽

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.

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Comparison of growth rate among different protein genotypes in Atlantic cod, Gadus morhua, under farmed conditions

ICES Journal of Marine Science ◽

10.1016/j.icesjms.2005.11.005 ◽

2006 ◽

Vol 63 (2) ◽

pp. 235-245 ◽

Cited By ~ 7

Author(s):

K.E. Jørstad ◽

Ø. Karlsen ◽

T. Svåsand ◽

H. Otterå

Keyword(s):

Growth Rate ◽

Gadus Morhua ◽

White Muscle ◽

Specific Growth ◽

Atlantic Cod ◽

The Past ◽

Aquaculture Industry ◽

A New Species ◽

Growth Experiments ◽

Selection Of

Abstract A major aim of the aquaculture industry in Norway is to develop sustainable farming of Atlantic cod, Gadus morhua L. A great deal of research, including farming trials and stock enhancement, has been performed on this species in Norway during the past two decades. The success of domestication of a new species depends on the genetic variability of the wild broodstock and the selection of appropriate genotypes for the farming environment. Growth experiments under farmed conditions, including genetic analyses, were started as early as 1983 after the breakthrough of cod juvenile production in mesocosm systems. At later stages (1988 and 1992 year classes), more detailed studies were conducted under farmed conditions. Based on individual tagging and genotyping (blood and white muscle biopsy sampling), estimates of growth performance (specific growth rate, SGR) of the various genotypes within six polymorphic protein loci were obtained. In general, the SGR in the two experiments varied through the year as a function of temperature and body size. In the 1988 year-class experiment, only a few statistically significant differences (ANOVA) were detected among genotypes, measured as mean weight and SGR. The 1992 year-class experiment included two different cod stocks, Northeast Arctic (NE) and Norwegian coastal (NC) cod, which were reared for about two years in the same net pen. Further, during this experiment, only a few genotypes exhibited significantly different growth within the NE group. No consistency was found in the variation with regard to protein loci investigated, growth periods studied, and relationship with temperature variation.

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