Quality control in fish feed. Quality control in the compound feed industry not only involves the... more Quality control in fish feed. Quality control in the compound feed industry not only involves the verification of quality standarts established for each feed ingredient as it is received into storage in the mill, but also involves the close monitoring of the quality of ingredients through the period of storage prior to usage and during its processing. Quality control continues as ingredients are merged during the mixing porcess and as they finally go into storage as compound feed.
Turkish Journal of Agriculture: Food Science and Technology, Dec 29, 2019
The growth of fish in intensive fish farming is carried out completely by the feeds supplied from... more The growth of fish in intensive fish farming is carried out completely by the feeds supplied from externally. Different ingredients are used in feed production. The nutritional content of these ingredients is checked when purchased or brought to the factory. These ingredients are then stored until feed production. Storage duration and storage temperatures directly affect the freshness criteria of feed ingredient materials. Especially when high-energy ingredients with high levels of fat are stored in poor storage conditions, the fats in the ingredients are oxidized, therefore the peroxide number increases and the ingredient becomes bitter. Oxidation not only destroys the lipids in fish feeds but also vitamins. Slow growth, poor feed evaluation, color darkening, lethargy and deaths have been reported in fish fed with diets that are oxidized and inadequate in vitamin E. In this study, oxidation levels of fish feed ingredients were determined due to different storage conditions. Generally, the number of peroxides increased due to the increase in storage time and temperature, depending on the type of raw materials and oil content.
Uluslararası tarım araştırmalarında yenilikçi yaklaşımlar dergisi, Sep 30, 2022
Fish oil is a virtually unique source of natural LC omega-3 fatty acids EPA, DPA, and DHA, as an ... more Fish oil is a virtually unique source of natural LC omega-3 fatty acids EPA, DPA, and DHA, as an important source of lipid in aquafeeds. However during processing and storage, fish oil is prone to oxidation. The oxidized oil has many negative effects on the growth and health of farmed fish, therefore this study was conducted to investigate the effect of oxidized anchovy oil on blood parameters and liver histology of Nile tilapia (Oreochromis niloticus). Nile tilapia fingerlings with an initial average body weight of (15.07±0.58 g) were stocked in nine fiberglass tanks (with a tank capacity of 120 liters) in three groups in triplicates at a density of 50 fish/tank. Fish were fed with three test diets containing 35% crude protein and 8% crude fat (POV: 4.85, 50.10, and 100.80 meq/kg-1) twice a day at a feeding rate of 3% of their body weight per day for 12 weeks. During the experiment fish blood parameters analysis, and liver histology tests were performed on 3 fish taken randomly from each tank at the beginning of the experiment and monthly. The results of blood chemistry analysis showed better results in the group fed with feed that contained fresh oil (A) compared to groups fed with feeds that contained oxidized oils (B and C), but no significant differences (P > 0.05) between feed groups. Whereas the results of serum biochemical analysis showed significant differences (P > 0.05) between feed groups during the experiment period, oxidized fish oil increased serum ALT, AST activity, and TCHO level (P < 0.05), and decreased ALP activity. The liver histology test showed the best results in group A compared to oxidized oil groups (B, C), oxidized fish oil caused damage to the liver structure, and hepatocyte nuclear migration and lipid droplets were observed in liver samples from the oxidized oil groups. In conclusion, the present study demonstrates that oxidized fish oil may have a negative effect on the liver histology and blood parameters of Nile tilapia fingerlings.
Ege Journal of Fisheries and Aquatic Sciences, 2002
Yem üretiminde karıştırma işleminin amacı besin maddelerinin ve ilâçların eşit dağılımının sağlan... more Yem üretiminde karıştırma işleminin amacı besin maddelerinin ve ilâçların eşit dağılımının sağlanmasıdır. Karışım işlemi en az sürede en az emek, enerji ve maliyetle yapılmalıdır. Karıştırıcının performansını çeşitli faktörler belirlemektedir. Bu faktörlerin karıştırma işlemine nasıl etki ettiğini anlamak testlerin sonuçlarının yorumlanmasında yardımcı olacaktır.The objective of the mixing process is to produce feed in which nutrients and medication are uniformly distributed. A satisfactory mixing process produces a uniform feed in a minimum cost of overhead, power and labor. Several factors are determine mixer performance. Understanding how these factors affect the mixing process is essential when interpreting the results of a mixer test
Ege Journal of Fisheries and Aquatic Sciences, 2006
Microscopic analyses in fish feeds. Microscopic identifications of feed are based on comparisons ... more Microscopic analyses in fish feeds. Microscopic identifications of feed are based on comparisons of unknown materials to known standards. For investigated feed and ingredients, stereomicroscope at 8x to 50x was used. Ingredients samples were identified by their shape, color, particle size and texture.
Ege Journal of Fisheries and Aquatic Sciences, 2007
Determination methods of growth performance in fish feeding. Idea of making optimum of the growth... more Determination methods of growth performance in fish feeding. Idea of making optimum of the growth, which is the main aim of the production, is being important in aquaculture, which has a great importance in recent years. Having the best growth performance for an animal is the main aim of the aquaculture. So, monitoring of the growth of the animals in every stage will give us information about growth performance of them and it allows us to determinate feeding strategies according to this performance. In this study, methods, which allow monitoring growth in fish feeding, was examined.
Quality control in fish feed. Quality control in the compound feed industry not only involves the... more Quality control in fish feed. Quality control in the compound feed industry not only involves the verification of quality standarts established for each feed ingredient as it is received into storage in the mill, but also involves the close monitoring of the quality of ingredients through the period of storage prior to usage and during its processing. Quality control continues as ingredients are merged during the mixing porcess and as they finally go into storage as compound feed.
Turkish Journal of Agriculture: Food Science and Technology, Dec 29, 2019
The growth of fish in intensive fish farming is carried out completely by the feeds supplied from... more The growth of fish in intensive fish farming is carried out completely by the feeds supplied from externally. Different ingredients are used in feed production. The nutritional content of these ingredients is checked when purchased or brought to the factory. These ingredients are then stored until feed production. Storage duration and storage temperatures directly affect the freshness criteria of feed ingredient materials. Especially when high-energy ingredients with high levels of fat are stored in poor storage conditions, the fats in the ingredients are oxidized, therefore the peroxide number increases and the ingredient becomes bitter. Oxidation not only destroys the lipids in fish feeds but also vitamins. Slow growth, poor feed evaluation, color darkening, lethargy and deaths have been reported in fish fed with diets that are oxidized and inadequate in vitamin E. In this study, oxidation levels of fish feed ingredients were determined due to different storage conditions. Generally, the number of peroxides increased due to the increase in storage time and temperature, depending on the type of raw materials and oil content.
Uluslararası tarım araştırmalarında yenilikçi yaklaşımlar dergisi, Sep 30, 2022
Fish oil is a virtually unique source of natural LC omega-3 fatty acids EPA, DPA, and DHA, as an ... more Fish oil is a virtually unique source of natural LC omega-3 fatty acids EPA, DPA, and DHA, as an important source of lipid in aquafeeds. However during processing and storage, fish oil is prone to oxidation. The oxidized oil has many negative effects on the growth and health of farmed fish, therefore this study was conducted to investigate the effect of oxidized anchovy oil on blood parameters and liver histology of Nile tilapia (Oreochromis niloticus). Nile tilapia fingerlings with an initial average body weight of (15.07±0.58 g) were stocked in nine fiberglass tanks (with a tank capacity of 120 liters) in three groups in triplicates at a density of 50 fish/tank. Fish were fed with three test diets containing 35% crude protein and 8% crude fat (POV: 4.85, 50.10, and 100.80 meq/kg-1) twice a day at a feeding rate of 3% of their body weight per day for 12 weeks. During the experiment fish blood parameters analysis, and liver histology tests were performed on 3 fish taken randomly from each tank at the beginning of the experiment and monthly. The results of blood chemistry analysis showed better results in the group fed with feed that contained fresh oil (A) compared to groups fed with feeds that contained oxidized oils (B and C), but no significant differences (P > 0.05) between feed groups. Whereas the results of serum biochemical analysis showed significant differences (P > 0.05) between feed groups during the experiment period, oxidized fish oil increased serum ALT, AST activity, and TCHO level (P < 0.05), and decreased ALP activity. The liver histology test showed the best results in group A compared to oxidized oil groups (B, C), oxidized fish oil caused damage to the liver structure, and hepatocyte nuclear migration and lipid droplets were observed in liver samples from the oxidized oil groups. In conclusion, the present study demonstrates that oxidized fish oil may have a negative effect on the liver histology and blood parameters of Nile tilapia fingerlings.
Ege Journal of Fisheries and Aquatic Sciences, 2002
Yem üretiminde karıştırma işleminin amacı besin maddelerinin ve ilâçların eşit dağılımının sağlan... more Yem üretiminde karıştırma işleminin amacı besin maddelerinin ve ilâçların eşit dağılımının sağlanmasıdır. Karışım işlemi en az sürede en az emek, enerji ve maliyetle yapılmalıdır. Karıştırıcının performansını çeşitli faktörler belirlemektedir. Bu faktörlerin karıştırma işlemine nasıl etki ettiğini anlamak testlerin sonuçlarının yorumlanmasında yardımcı olacaktır.The objective of the mixing process is to produce feed in which nutrients and medication are uniformly distributed. A satisfactory mixing process produces a uniform feed in a minimum cost of overhead, power and labor. Several factors are determine mixer performance. Understanding how these factors affect the mixing process is essential when interpreting the results of a mixer test
Ege Journal of Fisheries and Aquatic Sciences, 2006
Microscopic analyses in fish feeds. Microscopic identifications of feed are based on comparisons ... more Microscopic analyses in fish feeds. Microscopic identifications of feed are based on comparisons of unknown materials to known standards. For investigated feed and ingredients, stereomicroscope at 8x to 50x was used. Ingredients samples were identified by their shape, color, particle size and texture.
Ege Journal of Fisheries and Aquatic Sciences, 2007
Determination methods of growth performance in fish feeding. Idea of making optimum of the growth... more Determination methods of growth performance in fish feeding. Idea of making optimum of the growth, which is the main aim of the production, is being important in aquaculture, which has a great importance in recent years. Having the best growth performance for an animal is the main aim of the aquaculture. So, monitoring of the growth of the animals in every stage will give us information about growth performance of them and it allows us to determinate feeding strategies according to this performance. In this study, methods, which allow monitoring growth in fish feeding, was examined.
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