Live Weight Of Fish Research Articles

Изучение эффективности использования кормовой добавки «Файбрамакс Плюс» в рационе стербела

A study of the feed additive “Faybramax Plus”, which is a metabiotic for the management of fish autoflora and comprehensive prevention of bacterial infections, was conducted on sterbel yearlings with an initial weight of 130 g. The experience takes place in swimming pools. The water supply in the pools was carried out from a well. The conditions of detention corresponded to the technology of fish farming. The duration of the experiment was 60 days. The number of fish in the group was 150. The control group 1 received a full-fledged combo feed; group 2 was given a full-fledged compound feed + 0.3% of the feed additive “Faybramax Plus”; Group 3 consumed full-fledged compound feed + 0.6% of the feed additive “Faybramax Plus”; group 4 was fed full-fledged compound feed + 1.0% of the feed additive “Faybramax Plus”. It was found that when using the studied feed additive, the live weight of fish in the experimental groups increased by 1.9–6.0% at the end of cultivation. The protein content in the body of sterbel was higher compared to the control by 1.8–7.5%. The cost of the resulting products (increase) compared with the control, it decreased by 4.87–13.78% per group. Profit when using the feed additive “Faybramax Plus” increased by 345.11–1,068.23 rubles per group. The level of profitability increased by 2.71–7.66% per group compared to the control. As a result of the conducted research, it was found that the use of the feed additive “Faybramax Plus” produced by the company SYMBIO is most effective in a percentage ratio of 0.6% by weight of feed, as a result of which the level of profitability increases by 7.66%.

Influence of protein concentrates in compound feeds on hematological parameters of fish

In the field of feeding aquaculture objects, it is important to search for alternative feed sources. The purpose of the research was to evaluate the effect of high-protein feed concentrates on the growth performance and hematological composition of rainbow trout. Research was carried out At the enterprise IP Kalmykova I. O. in order to study the protein concentrate Gorlinka in compound feed for rainbow trout. The trout of the control group were fed compound feed with sunflower meal, and the fi sh of the 1st, 2nd and 3rd experimental groups were fed compound feed in which sunflower meal was replaced with Gorlinka concentrate – 50 %, 75 and 100 %, respectively, for the groups. Research on the introduction of the protein concentrate Agro-Matic into the compound feed of rainbow trout was carried out under the conditions of the Scientifi c Research Center “Breeding of valuable sturgeon breeds” of the Volgograd State Agrarian University. The fish of the control group received the main diet with fish-meal, and in the diet of the trout of the 1st, 2nd and 3rd experimental groups, 25 %, 50 and 75 % of fish-meal were replaced with Agro-Matic concentrate. It was found on the base of results obtained that the introduction of Gorlinka concentrate into the compound feed formulation contributed to the increase in the overall gain in live weight of fi sh by 2,83–6,93 %. The use of Agro-Matic concentrate in compound feed had a positive effect on the live weight of fish; it increased by 1,29–5,26 %. The content of total protein in the blood serum of fish from the experimental groups relative to the control increased by 0,65 %, 1,64 and 3,27 % with the introduction of the Gorlinka concentrate into the diet, and the Agro-Matic protein concentrate by 1,01 %, 2,44 and 3,55 %, respectively, which is due to balance of the recipes. When studying some indicators of fish blood we found that with a balanced diet the biochemical composition of trout blood is quite constant and is within the physiological norm for salmon fish.

Growing juvenile beluga and its hybrids with sterlet in environmentally friendly conditions

Currently, the general trend of the global fishing industry is to increase the production of fish food products not only due to the development of aquaculture, but also the biological characteristics of the body of sturgeon. The aim of the study was the theoretical justification and practical implementation of the assessment of the growth and development of beluga juveniles and their hybrids with sterlet aged 0+ to 2+ (three-year-olds) in industrial of the Krasnodar Territory. The determined: fish mass, live weight gain, linear growth. By the end of the control cultivation, the weight of fish in the control and experimental groups was 1728.3 and 2236.4 g, respectively. In the experimental group, the absolute increase in live weight of fish was 2198.2 g, while in the control group it was 1692.2 g. The difference in average daily gains was 0.71 g in favour of hybrids. The body length of the fish in the control and experimental groups was 32.7 and 37.3 cm. The positive effect of heterosis had a positive effect on the first- generation crossbreeds obtained from beluga and sterlet.

QUANTITATIVE AND QUALITATIVE EFFECTS OF 010K - LACTOBACILLUS PARACASEI AND THE "ECOPROBIOTIC" PROBIOTIC PREPARATION ON THE GROWTH AND INTESTINAL MICROFLORA OF FISH

The most important result of fish rearing in closed water systems is to achieve the highest possible growth rate while creating optimal aqueous environment factors. The growth of fish is influenced by many factors, including probiotics in artificial diets. In this sense, functional food supplements, including pro-, pre- and synbiotics, are gaining increasing attention as an environmentally sound strategy to improve fish health. Probiotics, participating in digestive processes, affect the metabolism of the host organism, promote protein synthesis and increase the degree of their assimilation. The aim of this study was to investigate the effects of the 010K - Lactobacillus paracasei strain that isolated from Kazakhstan koumiss and the "Ecoprobiotic" probiotic preparation on the growth of intestinal microflora in Nile tilapia. The study outcomes displayed that live weight of fish in the experimental groups (010K - Lactobacillus paracasei and probiotic preparation "Ecoprobiotic") was higher than in the control group. Moreover, fish fed with the "Ecoprobiotic " probiotic and 010K - Lactobacillus paracasei strain had a significantly higher number of yeast cells compared to the control group. In summary, the 010K - Lactobacillus paracasei and probiotic preparation "Ecoprobiotic" may be a promising candidate for the improving growth and intestinal microbiota of Nile tilapia.

Effect of Olive Leaves and Propolis Extracts on Growth Performance, Immunological Parameters and Economic Efficiency using Nile Tilapia (Oreochromis niloticus)

This study aimed to evaluate the effects of olive leaves ether extract (EEOL) and ethanol extract of propolis (EEP) on growth performance, body composition, nutrient digestibility, immunological parameters and economic efficiency in Nile tilapia, Oreochromis niloticus. Three Isonitrogenous (crude protein 35%), isocaloric (Digestable energy, 2900kcal) diets were fed to Nile tilapia averaging 19.7 ±0.94 g. A basal control diet had no additives, second and third diets containing 0.1% EEOL (1g/kg) and 0.4% EEP (4 g/kg) for successive 12 weeks. Results revealed that the dietary addition of EEOL and EEP had significant effects on growth performance parameters and protein utilization (P≤0.029). In addition, dietary supplement of EEP was more prominent than with EEOL and propolis extracts on fish final body gain and protein utilization. The carcass content from dry matter, protein and fat contents recorded higher values in EEOL or EEP supplemented groups. Furthermore, nutrient digestibility was improved by adding EEOL and EEP. The total leucocytes count, lymphocytes %, monocytes %, phagocytic activity, plasma total protein and globulin showed higher levels in fish groups with dietary addition of EEOL and EEP extracts than in fish fed the control diet. In terms of economic analysis, EEOL and EEP extract diet revealed the lowest cost per kg live weight of fish, along with the highest economic return and net profit. Addition of EEOL or EEP extracts to diet resulted in a more economically efficient production than in fish fed the control diet. Our results suggested that the dietary inclusion of EEOL (1g/kg) or EEP extracts (4g/kg) markedly enhanced growth performance, body composition, feed digestibility, immune status and economic efficiency using Nile tilapia.

Estimation of Bluegill (Lepomis macrochirus) Proximate Composition with Regression Models

Dry weight, protein, fat, and ash proximates were determined for 100 individual laboratory reared bluegill (Lepomis macrochirus). Regression analysis using forms of length and weight provided models for prediction of proximates. Percent dry weight was a linear function of coefficient of condition (r = 0.866). Natural logarithm of ash was a linear function of natural logarithm of length (r = 0.997). Percent fat was a function of coefficient of condition and natural logarithm of length (r = 0.796). Percent protein was a function of coefficient of condition and natural logarithm of length times natural logarithm of weight (r = 0.768). The regression models, based only on length and live weight of fish, allowed accurate prediction of bluegill proximate composition for a laboratory fish population raised on chironomid larvae.