Impact of feeding levels on growth performance and food conversion of Acanthopagrus arabicus cultivated in concrete tanks at Basrah province

Most fish farmers in Malawi culture unimproved fish strains whose growth is slow and mature while still small. Four strains of Oreochromis, namely; selectively-bred/improved O. shiranus (F8), two reciprocal F1 Oreochromis hybrids, and O. karongae as a control (mean weight 2.5 ± 0.7 g) were stocked at a density of 5fish/m2 in 9m2 hapas replicated three times, and cultured for 90 days at Bunda Fish Farm. Fish were fed twice a day with feed formulated using maize bran and soybean containing 30% crude protein throughout the experimental period. The final mean weights were significantly different (p<0.05) across the treatments whereby; hybrid O. shiranus (male) X O. karongae (female) was 12.09g, hybrid O. shiranus (female) X O. karongae (male) was 9.72g, improved O. shiranus (F8) registered 9.23g, and O. karongae was the least with 9.00g. Apparent food conversion ratio was also statistically different (p<0.05) across the treatments whereby; O. karongae was 3.63, hybrid O. shiranus (female) X O. karongae (male) was 3.25, improved O. shiranus (F8) was 3.16 and hybrid O. shiranus (male) X O. karongae (female) was lowest with 2.26. There were no significant differences on the water quality parameters across the treatments throughout the experimental period and were within the required ranges for growth and survival of tilapias fish species. The results suggest that Oreochromis hybrids may be suitable candidates for aquaculture in terms of production as they performed better than the improved O. shiranus and the control O. karongae.

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Effect of metal frequencies on growth performance and food conversion of Heterobranchus bidorsalis fingerlings

Journal of Aquatic Sciences ◽

10.4314/jas.v20i2.20043 ◽

2006 ◽

Vol 20 (2) ◽

Author(s):

AA Dada ◽

AA Akinwande

Keyword(s):

Growth Performance ◽

Food Conversion

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Rising Temperature Effects on Growth and Gastric Emptying Time of Freshwater African Catfish (Clarias Gariepinus) Fingerlings

Animals ◽

10.3390/ani11123497 ◽

2021 ◽

Vol 11 (12) ◽

pp. 3497

Author(s):

Sonia Mohd Kasihmuddin ◽

Mazlan Abd. Ghaffar ◽

Simon Kumar Das

Keyword(s):

Gastric Emptying ◽

Water Temperature ◽

Growth Performance ◽

Clarias Gariepinus ◽

African Catfish ◽

Food Conversion ◽

Gastric Emptying Time ◽

The Impact ◽

Limited Scope ◽

Emptying Time

The present study was carried out to analyse the effect of water temperature on two components: (1) growth performance, and (2) gastric emptying time (GET) of African catfish Clarias gariepinus fingerlings. After 70 days, it was observed that experimental temperatures had no significant effects on the growth performance parameters, except for food conversion ratio (FCR) and food conversion efficiency (FCE). GET observation through X-radiography denoted that the shortest GET (10 h) was observed in fish reared at 32 °C and the longest GET (16 h) was observed in fish reared at 26 °C. The rapid digestion rate coincides with the FCR and FCE obtained in this study. Considering the limited scope of our study, more extensive studies on the impact of water temperature on other fish physiological parameters should be pursued. A better understanding of this research topic would be beneficial for the growth of African catfish fingerling aquaculture.

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The influence of dietary protein and level of feeding on the growth performance and carcass characteristics of entire and castrated male pigs

Animal Science ◽

10.1017/s0003356100027331 ◽

1982 ◽

Vol 35 (2) ◽

pp. 177-184 ◽

Cited By ~ 13

Author(s):

R. G. Campbell ◽

R. H. King

Keyword(s):

Growth Rate ◽

Food Intake ◽

Growth Performance ◽

Dietary Protein ◽

Protein Level ◽

Carcass Characteristics ◽

Live Weight ◽

Conversion Ratio ◽

Food Conversion ◽

Ad Libitum

ABSTRACT1. Three isocaloric diets containing 170, 210 or 231 g crude protein per kg were given at two levels, and offered ad libitum to entire and castrated male pigs growing from 20 to 70 kg live weight.2. Between 20 and 45 kg, growth rate improved with each increase in level of feeding (P < 005) and, on the ad libitum treatment the food intake and growth performance of both entire and castrated pigs were similar. On the restricted feeding treatments the growth performance of entire, but not of castrated pigs, improved when dietary protein was raised from 170 to 210g/kg (P < 005).3. During the live-weight periods 45 to 70 and 20 to 70kg, raising food intake improved growth rate (P < 005) but increased the food conversion ratio and carcass fat measurements at 70 kg (P < 0·05). However, food conversion ratio and the majority of carcass characteristics of entire pigs fed ad libitum were equivalent to those of castrated pigs fed at the lowest level.4. Dietary protein level had no significant effect on growth performance from 20 to 70 kg or on carcass fat measurements at the latter weight. However, each increase in dietary protein in the live-weight period 45 to 70 kg depressed the performance of castrated pigs (P < 0·05) while that of entire pigs was reduced when the protein level of the diet was raised from 210 to 231 g/kg.

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Power requirement of swimming in chinook salmon and Atlantic salmon and implications for food conversion and growth performance

Aquacultural Engineering ◽

10.1016/s0144-8609(00)00052-2 ◽

2000 ◽

Vol 22 (3) ◽

pp. 225-239 ◽

Cited By ~ 9

Author(s):

Royann J. Petrell ◽

Rachael E. Jones

Keyword(s):

Atlantic Salmon ◽

Growth Performance ◽

Chinook Salmon ◽

Food Conversion ◽

Power Requirement

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Growth performance and carcass characteristics of two genotypes of growing-finishing pig in three different housing systems

Animal Science ◽

10.1017/s1357729800052656 ◽

2002 ◽

Vol 74 (3) ◽

pp. 493-502 ◽

Cited By ~ 18

Author(s):

J. H. Guy ◽

P. Rowlinson ◽

J. P. Chadwick ◽

M. Ellis

Keyword(s):

Growth Performance ◽

Average Daily Gain ◽

Carcass Characteristics ◽

Live Weight ◽

Conversion Ratio ◽

Growing Pigs ◽

Food Conversion ◽

Large White ◽

Food Conversion Ratio ◽

Genotype 2

AbstractA trial was conducted to compare the growth performance and carcass characteristics of 720 growing pigs housed in one of three different finishing systems: outdoor paddocks, straw yards and fully slatted pens. Two genotypes were used: ‘indoor’ (progeny of Large White ✕ Landrace sows mated to Large White boars) or ‘outdoor’ (progeny of part-Duroc or part-Meishan sows, mated to Large White boars). Groups of 20 pigs were reared from an average of 30 to 80 kg live weight and given ad libitum access to a commercial specification diet. The outdoor genotypes had significantly lower average daily gain than the indoor genotype (682, 673 and 719 g respectively for part-Duroc, part-Meishan and indoor-type pigs, P 0·01). Part-Meishan genotypes had significantly higher backfat levels than the indoor genotype (P 0·05), with an intermediate value for part-Duroc pigs (22·6, 21·1 and 21·8 mm respectively). Values for food conversion ratio were significantly higher for combined outdoor genotype groups when compared with the indoor genotype (2·76 v. jt>2·62, P 0·05). Average daily gains of pigs in straw yards and outdoor paddocks were significantly higher than for those in fully slatted pens (736 and 675 v. 627 g, P 0·01 respectively). Food conversion ratio was similar for pigs in outdoor paddocks and fully slatted pens, but significantly lower for those in straw yards (2·77 and 2·75 v. 2·55, P 0·01 respectively). Backfat depth (P1 + P3mm) was significantly greater for animals finished in straw yards compared to those in outdoor paddocks (22·2 v. 20·6 mm, P 0·05) and intermediate for those finished in fully slatted pens (21·5 mm). Interaction between finishing system and genotype did not occur to any major degree, hence it appears unnecessary to specify a particular genotype for a particular finishing system. It was concluded that pigs of the outdoor genotype had a lower growth performance compared with the indoor genotype. Finishing systems however may have been confounded by other factors so that no clear recommendations can be made as to the optimum finishing system.

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Growth of Fry Fish of 4 Species of Family Mugilidae in Experimental Recirculation Water System

European Journal of Biology and Biotechnology ◽

10.24018/ejbio.2020.1.4.46 ◽

2020 ◽

Vol 1 (4) ◽

Author(s):

George Nick Hotos ◽

Despina Avramidou

Keyword(s):

Growth Performance ◽

Condition Factor ◽

Water System ◽

Conversion Ratio ◽

Mugil Cephalus ◽

Food Conversion ◽

Protein Food ◽

Liza Aurata ◽

Recirculation System ◽

Of Greece

The collected in nature fry of Mugil cephalus, Liza aurata, L. ramada and Chelon labrosus that arrive in massive schools at the coastline of Greece were reared in small aquaria (50 L) of a recirculation system from the size of about 3.0 cm TL (50 fish per aquarium), using brackish (15 ppt) water and artificial high protein food. It was found that for a period of 80 days, growth performance was high at 23 oC, reaching values for weight increase between 592 (M. cephalus) and 2281 % (L. aurata). Food Conversion Ratio (FCR) was best (1.04) for L. aurata and worst (2.04) for M. cephalus. All species responded well as exhibited by an increase in their Condition Factor (CF) and mortality was almost absent.

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