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2023 ◽  
Vol 83 ◽  
Author(s):  
F. Asad ◽  
A. Ashraf ◽  
A. Rafique ◽  
S. Qamer ◽  
S. Naz ◽  
...  

Abstract A ninety days nutritional trial was directed to explore the effects of dietary chromium on body composition, gut enzyme activity and physiological status of Cirrhinus mrigala by using G & NG corn. Six experimental diets were prepared by using different levels of chromium chloride hexahydrate (0, 0.2, 0.4 mg/kg, each with G & NG corn). For this experimental trial, 480 fingerlings, irrespective of sex were distributed in six aquariums each with replicate. Results revealed that gelatinized corn along with increasing level of Cr2Cl3.6H2O have a positive impact upon body composition of fish. Hematology was positively correlated with chromium chloride hexahydrate supplementation in gelatinized corn. Amylase gut enzyme also showed significant (P<0.05) increase in group fed with chromium chloride hexahydrate supplemented diet (G corn). However, corn with chromium chloride hexahydrate supplementation did not revealed any significant impact on gut protease enzyme activity. From these results it can be concluded that both chromium chloride hexahydrate and gelatinized corn in fish feed are very beneficial to improve body composition, enzymes activity and physiological health status of fish.


2023 ◽  
Vol 83 ◽  
Author(s):  
B. Ahmad ◽  
S. M. Hussain ◽  
S. Ali ◽  
M. Zubair-ul-Hassan Arsalan ◽  
S. Tabassum ◽  
...  

Abstract The growth of aquaculture sector is strongly dependent upon the continuous supply of inexpensive fish feed with balanced nutritional profile. However, fish meal (FM) is unable to satisfy this demand due to its scarce supply and high cost. In order to test the potential of cottonseed meal (CSM) as a fish meal replacer, a feeding trial of 12 weeks was conducted to check growth performance and proximate composition of Labeo rohita fingerlings. The protein ration of the test feed was satisfied by replacing FM with CSM at 0, 25, 50 and 75%. Sixteen test diets viz., TD1 (control), TD2, TD3, TD4, TD5, TD6, TD7, TD8, TD9, TD10, TD11, TD12, TD13, TD14, TD15 and TD16 were supplemented with citric acid (CA; 0 and 2.5%) and phytase (PHY; 0 and 750 FTU/kg) in a completely randomized design with 3×3 factorial arrangement. The highest weight gain (11.03g), weight gain% (249.21%), specific growth rate (1.39) and best feed conversion ratio (1.20) were recorded by fish fed with TD12. Furthermore, the same level increased the crude protein (59.26%) and fat (16.04%) being significantly different (p<0.05) than that of control. Conclusively, the addition of acidified phytase (CA; 2.5%, PHY; 750 FTU/kg) in TD12 (CSM=50%) led to the improved growth and proximate composition of L. rohita fingerlings.


Water ◽  
2022 ◽  
Vol 14 (2) ◽  
pp. 250
Author(s):  
Janet B. García-Martínez ◽  
Jefferson E. Contreras-Ropero ◽  
Néstor A. Urbina-Suarez ◽  
Germán L. López-Barrera ◽  
Andrés F. Barajas-Solano ◽  
...  

The present research evaluates the simulation of a system for transforming inland-fisheries wastewater into sustainable fish feed using Designer® software. The data required were obtained from the experimental cultivation of Chlorella sp. in wastewater supplemented with N and P. According to the results, it is possible to produce up to 11,875 kg/year (31.3 kg/d) with a production cost of up to 18 (USD/kg) for dry biomass and 0.19 (USD/bottle) for concentrated biomass. Similarly, it was possible to establish the kinetics of growth of substrate-dependent biomass with a maximum production of 1.25 g/L after 15 days and 98% removal of available N coupled with 20% of P. It is essential to note the final production efficiency may vary depending on uncontrollable variables such as climate and quality of wastewater, among others.


2022 ◽  
Author(s):  
Khushboo ◽  
Nutan Kaushik ◽  
Kristina Norne Widell ◽  
Rasa Slizyte ◽  
Asha Kumari

Abstract Surimi industry produces large quantity of by-products as a combination of skin, bones, and scale, which due to technical difficulty in separation, are being currently utilized for production of low- value products such as biofertilizers and fish feed. Present paper focuses on utilization of combined skin, bones, and scale from Pink Perch (Nemipterus japonicus) obtained from surimi industry for gelatin extraction using single step process. Single step extraction method with acetic acid and water was optimized using Response Surface Methodology (RSM) to maximize yield and gel strength so that the process can be applied for sustainable utilization. Parameters such as pH (A), extraction temperature (B) and extraction time (C) with respect to yield and L-hydroxyproline content were optimized. Highest gelatin yield was obtained at pH 3, 75°C extraction temperature, and 30 min extraction time. Gelatin yield and L-hydroxyproline content under optimum condition were 16.2% and 41.62 mg.g−1. The chemical composition, functional, rheological, and structural properties of gelatin were examined and compared with commercial bovine gelatin. Gelatin thus obtained at optimized condition exhibited high gel strength (793g) and higher imino acid content (18.1%) than bovine gelatin. FTIR spectra depicted high similarities between both gelatin sample. Thus, the optimized method can be utilized for gelatin extraction from Pink Perch by-products for development of high value products such as food application.


2022 ◽  
Author(s):  
Nure Alam Siddiky ◽  
Shariful Islam ◽  
Md Samun Sarker ◽  
Ruhena Begum ◽  
Mohammed A. Samad

Abstract The poultry farming is considered one of the hotspots for the use of antimicrobials. The knowledge, attitude and practices of poultry farmers are closely associated with the prudent use of antimicrobials in poultry farm practices. A cross sectional study was conducted among seventy-four commercial poultry farms using a pretested structured questionnaire survey to assess knowledge, attitude and practices of the poultry farmers regarding antimicrobial use, resistance and farm hygiene management. According to demographics, more farmers were secondary holders (29.72%), followed by higher secondary (22.97%) and illiterate (12.16%) with least number (13.51%) had training on antibiotics but no one had training on AMR. Farmers had sufficient knowledge about antibiotics (86.49%) but inadequate knowledge about antimicrobials (14.86%), AMR (51.35%), and animal and fish feed act (20.27%). The majority of farmers strongly agreed that AMR had a negative impact on production (40.54%), human health (36.49%), environment (33.78%) and economy (52.7%). Farm hygiene management revealed that most of them (90.54%) thrown the expired and leftover antibiotics in the open environments. Furthermore, the farm litter was managed diversely with 39.19% kept in open pit; 33.78% used in fish farm and 5.41% used for agricultural land. It was observed that the dead birds were disposed in a variety of ways, buried into ground (58.10%), thrown into field (9.45%), thrown into bush (6.75%), thrown into garbage (9.45%) and thrown in the water (13.51%). A significant higher association was found between the level of education and knowledge; level of education with farm practices such as choice of antibiotics, determining doses and duration of antibiotics, disposal of farm wastages, disposal of dead birds, farm biosecurity and vaccination coverage (p<0.05). Continuous education, hands-on training, awareness, and motivation of farmers along with good biosecurity, mass vaccination and proper hygienic measures can minimize the uses of antimicrobials in farm operations.


2022 ◽  
Author(s):  
Gabriela Musin ◽  
María Victoria Torres ◽  
Débora de Azevedo Carvalho

The Metabolic Theory of Ecology (MET) and the Ecological Stoichiometry Theory (EST) are central and complementary in the consumer-driven recycling conceptual basis. The comprehension of physiological processes of organisms at different levels of organizations is essential to explore and predict nutrient recycling behavior in different scenarios, and to design integrated productive systems that efficiently use the nutrient inputs through an adjusted mass balance. We fed with fish-feed three species of decapods from different families and with aquacultural potential to explore the animal-mediated nutrient dynamic and its applicability in productive systems. We tested whether physiological (body mass, body elemental content), ecological (diet), taxonomic and experimental (time of incubation) variables predicts N and P excretion rates and ratios across and within taxa. We also analysed body mass and body elemental content independently as predictors of N and P excretion of decapods across, among and within taxa. Finally, we verified if body content scales allometrically across and within taxa and if differed among taxa. Body mass and taxonomic identity predicted nutrient excretion rates both across and within taxa. When physiological variables were analysed independently, body size best predicted nutrient mineralization in both scales of analyses. Regarding body elemental content, only body P content scaled negatively with body mass across taxa. Results showed higher N-requirements and lower C:N of prawns than anomurans and crabs. The role of crustaceans as nutrient recyclers depends mainly on the species and body mass, and should be considered to select complementary species that efficiently use feed resources. Prawns need more protein in their feed and might be integrated with fish of higher N-requirements, while crabs and anomurans, with fish of lower N-requirements. Our study contributed to the background of MTE and EST through empirical data obtained from decapods and provided useful information to achieve more efficient aquaculture integration systems.


2022 ◽  
Vol 4 (2) ◽  
pp. 966-972
Author(s):  
Isna Dini ◽  
Hapsoh Hapsoh ◽  
Rachmad Saputra ◽  
Desita Salbiah ◽  
Sri Yoseva

Oyster mushroom is a mushroom that is quite in demand by the people of Pekanbaru City. One of the oyster mushroom producers in Pekanbaru is a young entrepreneur named Solihin who is a student of the Department of Agrotechnology, Riau University. Oyster mushroom production ranges from 15-40 kg/day. The high production of mushrooms is supported by the number of baglogs owned by Solihin. After being used to produce mushrooms, this baglog will of course become waste. The high content of organic matter in baglog waste makes baglog waste a potential medium for the development of African Night Crawlers (ANC) worms. Furthermore, the remaining growth media for this worm can be used as vermicompost fertilizer. Therefore, the purpose of this service is to provide assistance in the cultivation of ANC worms to entrepreneurs who are partners in this service. Based on the results of the service carried out, partners have succeeded in developing by-products other than oyster mushrooms into useful and selling products which can certainly increase partners' income. In addition, partners are also developing fish farming as a continuation of the use of ANC worms as fish feed. This is because ANC worms are a high source of protein for fish feed. Through this service activity, the development of integrated agricultural agribusiness has been realized.


Author(s):  
Ombugadu A ◽  
◽  
Okunsebor SA ◽  

One of the factors militating against fish farming in Nigeria have been lack of adequate feed that are formulated to meet the nutrient requirement of culturable fish species. To this end, the study on dietary inclusion of Citrullus lanatus (watermelon) seed in fish feed: the proximate analysis, determination of growth performance and feed utilization in Clarias gariepinus fingerlings was carried out between August and October 2019. The proximate analysis and economic viability were determined according to standard methods. The experimental diet was set up across varying proportions: 0% as the control, 15%, 20%, 25% and 36% inclusion levels respectively. The result of the proximate analysis for the experimental diets showed that diet 3 (20.00% inclusion) had the highest crude protein content; lipid level was highest in diet 4 (25% inclusion); while diet 1 (control) had the highest dry matter, ash and nitrogen free extract contents. The result of the experiment showed that 36% watermelon seed inclusion yielded the highest growth performance and feed utilization in Clarias gariepinus fingerlings. However, there was no significant difference (P > 0.05) in relation to inclusion percentages of watermelon seed on growth performance in Clarias gariepinus fingerlings. In conclusion, relatively high proportion of watermelon seed inclusion in fish feed formulation is hereby recommended in order to improve growth performance and feed utilization in Clarias gariepinus fingerlings.


Author(s):  
Adedokun Mathew Adewale ◽  

High cost of qualitative fish feed is one of problems hampering the development and profitability of fish farming and consequently leads to food insecurity in terms of food availability and accessibility. The study was conducted to determine growth parameters and carcass composition of Clarias gariepinus juveniles of mean weight 21.74g+0.54g fed with varying levels of dietary inclusion of Clitoria ternatea seed meal substituted for soybean meal over a period of eight weeks. Four iso-nitrogenous experimental diets were formulated at 0% (control), 25%, 50% and 100% inclusion levels of C. ternatea seed meal. The 8-week feeding experiment was conducted in rectangular plastic tanks, each treatment having three replicates with two feeding regime at 5% body weight and weighed every week. At the end of the intensive feeding period, samples from each treatment were oven dried for nutritive analysis of the fish carcass. The values of mean weight gain for diets I and III were 27.7+1.11 and 27.23+0.94 respectively. Comparatively, the growth parameters values; FI(g), SGR(%), FCR(g), PER(%) and NPU(%) for control diet and diet III were the best with no significant difference (p>0.05). The Carcass evaluation revealed that Diet I had the highest crude protein which was not significantly different (p>0.05) from diet III. It was established that fish fed 50% inclusion level of C. ternatea seed meal had effective comparable biological values with the control diet in terms of growth performance and feed utilization. The total fish production (kg) showed no significant difference (p>0.05) between diets I and III.


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