Effects of two feeding rates on the growth performance and survivability of Clarias gariepinus fingerlings fed on Skretting fish feed
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Two feeding rates; 5% body weight and feeding to satiation were evaluated to determine their effects on the growth performance and survivability of Clarias gariepinus fingerlings. The objective of the study was to determine which feeding rate was more beneficial to the fish farmer in terms of fish weight gain, length gain, specific growth rate, feed conversion ratio and survivability of the catfish fingerlings. The study was carried out with 600 Clarias gariepinus fingerlings of mean weight 2.23 ± 0.10 g and mean length 6.58 ± 0.01 cm kept in six 1 m3 rectangular tanks labeled A to E and containing 100 fingerlings each. Fingerlings in tanks A, B and C were three replicates fed with 1.8 mm Skretting fish feed at 5% body weight while fingerlings in tanks D, E and F also three replicates, were fed to satiation with the same feed for 30 days. Water quality parameters; temperature, pH, and dissolved oxygen were monitored. Body weight, length, and survivability were recorded every 5 days at 0, 5, 10,15, 20, 25, and 30 days. Results showed that water quality parameters and survival rates did not significantly differ(p>0.05) between the 5% body weight feeding rate group and the group fed to satiation. The average weight gain (26.11± 3.65 g), length gain (6.11± 0.20 cm), specific growth rate (5.96 ± 0.15%) and feed conversion ratio (1.1) of the 5% body weight feeding rate group differed significantly (p< 0.05) from those of the group fed to satiation; 16.16 ± 3.04 g, 4.44 ± 0.40 cm, 4.58 ± 0.17% and 1.3 respectively. It was concluded that feeding fingerlings by 5% body weight was of better economic importance to the fish farmer and was therefore recommended to be practiced for profitability and sustainable fish culture development.Keywords:
Clarias gariepinus
The effects of dietary mannaoligosaccharides (MOS) and β-glucan on the production performance of African catfish, Clarias gariepinus, was examined in this study. Three (3) trial diets were produced viz-a-vis., Control (basal diet, BD), MOS (BD + 0.2% MOS) and β-glucan (BD +0.02% β-glucan) and fed to catfish (11.77±0.05 g fish-1) for 63 days. Nine circular tanks were distinctly assigned into 3 dietary groups in triplicate, stocked with 100 fish per tank (85 L), and fed twice daily (8:00 - 9:00h and 17:00 - 18:00h). The results indicated that there was no significant difference (p>0.05) in the mean final body weight, specific growth rates, feed conversion and protein efficiency ratios, and survivals among the various treatments groups. Similarly, somatic indices (condition factors, hepatosomatic indices, and viscerosomatic indices) measured were not significantly different (p>0.05) across the experimental groups. However, the haematological parameters such as packed cell volume, haemoglobin as well as the erythrocyte and leucocyte counts were significantly (p<0.05) lower in the catfish fed MOS diet. It could be concluded herewith that dietary supplementation of MOS and β-glucan do not have a deleterious effect on African catfish production. Further study is however warranted to establish dose-response effect of MOS and β-glucan on innate immunity of African catfish (C. gariepinus).
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The aim of the present study was to investigate and establish reference ranges for haematological values for Bagrid catfish (Chrysichthys nigrodigitatus) from Asejire Dam in Southwestern Nigeria and compared it with that of the African catfish (Clarias gariepinus) from the same dam. In the present work hematologic indices (RBC, WBC, Ht, Hb, MCV, MCH, MCHC), were determined using standard methods. The mean ± SEM and range were established. RBC, Hb, lymphocyte and MCV differs significantly between the Bagrid catfish and the African catfish.
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Surimi is the fish protein prepared by washing minced fish flesh after removing thorn.Catfish (Karmout) has many of undesirable characteristics including the short storage life.Production of surimi from Karmout consumes large amounts of washing water.In general, changes due washing should be studied first before trials to decrease the water consumption during processing, which was the aim of this investigation.In the present work, the effect of washing on the quality of minced catfish using three washing steps to obtain Karmout surimi was investigated.By this method the minced flesh washed using NaHCO 3 (0.2%), followed by distilled water and lastly with NaCl (0.15%).Our results revealed that most loss in yield occurred through the 2 nd step (distilled water) and the 3 rd step (NaCl) of washing.As a result of washing the per cent of moisture, total protein and salt extractable protein increased, while fat and ash levels decreased.Furthermore, it was found that the pH value showed a slight increase due to washing.The three washing steps improved the water holding capacity of minced fish especially at the 1 st step of washing.Values of total volatile bases nitrogen and trimethylamine as well as the thiobarbituric acid value decreased gradually due to washing.
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The relationship between body size, food utilization and growth of African catfish (Clarias gariepinus) fed on different practical diets was studied. The results show that African catfish can grow on commercial diets found in Israel. The protein level in diet and the sources of protein are the most important parameters in the diet of African catfish. The food utilization and growth are better in smaller fish than in larger fish. The food conversion and protein utilization was better in African catfish fed on diet with high animal protein sources than with plant protein sources. From the economic point of view, this study shows that African catfish requires an expensive diet, similar to that of the trout, and this may influence the possibility of developing a new branch of African catfish production in Israel.
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A review of the culture of catfish of the family Claridae in Nigeria was carried out using secondary data. The story of aquaculture in Nigeria is essentially the story of catfish culture. The favoured catfish species include: Clarias gariepinus, Heterobranchus bidorsalis,Clarias × Heterobranchus hybrid (‘Heteroclarias’) and Clarias nigrodigitatus. C. gariepinusand Heterobranchus are the most farmed fish in Nigeria. Catfish farming has continued to attract private sector initiative compared to earlier public or government-sponsored programmes. If the associated problems of production, especially the twin issue of feed production and fingerling supply are tackled, Nigeria will soon become a world exporter of catfish.
Key words: Nigeria, culture, catfish, Clarias, Heterobranchus.
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Shelf Life and Quality Stability Determination of Drying Shredded Dumbo Catfish (Clarias Gariepinus)
The purpose of this study was to determine the stability of the quality and shelf life of dried shredded African catfish (Clarias gariepinus). The method used in this study was quantitative research using an experimental method using a completely randomized design with three different drying treatments. The stability of the drying quality of African catfish shredded (Clarias Gariepinus) was the color of African catfish shredded with varying methods of drying, giving panelist scores ranging from 2.36 to 4.4; organoleptic value of African catfish floss ranged from 2.88 to 4.16; panelists' assessment of the texture of African catfish shredded ranged from 2.12 - 4.56; the taste of African catfish floss ranges from 2.08 to 4.44. Shredded African catfish with different drying durations that were most in demand by panelists was sample A3 shredded African catfish steamed and dried for 4 minutes in a spinner machine with a color score of 4.4, aroma 4.16, texture 4.56, and taste 4.44. The results of measurements using distribution turnover explained that the shelf life of shredded catfish could last up to 7 months and was reduced to 6 months to anticipate product damage earlier. Keywords: quality, shelf life, shredded dumbo catfish.
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Organoleptic
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Kamaboko is a processed fish product based on surimi, which is widely consumed by the public. Catfish protein isolate (CPI) can be applied to kamaboko to improve product quality. The aim of this research was to produce CPI and evaluate the physical, chemical, and sensory properties of kamaboko from Asian seabass surimi with CPI. The steps carried out in this research were the production of CPI using pH shifting, preparation of kamaboko, analysis of the amino acid profile of CPI, and physical, chemical, and sensory analysis of kamaboko. The kamaboko formula consisted of control (F1) and four treatments adding CPI, namely F2 (5 %), F3 (10 %), F4 (15 %), and F5 (20 %) per weight of surimi. CPI had a yield and protein recovery of 16.11 % wb and 20.96 % wb, respectively, from fresh catfish. The CPI protein content was 93.71 % db, which met Codex standards. CPI was rich in essential amino acids such as leucine, lysine, threonine, valine, isoleucine, and phenylalanine. The addition of CPI had a significant effect on the physical (colour, whiteness index, water holding capacity, profile textural), ash, protein, lipid, carbohydrate content, and sensory properties (appearance, texture, folding and biting test) of kamaboko. Kamaboko in all treatments had higher protein content than that of the standard composition of kamaboko in Japan, Korean commercial kamaboko, and met the Indonesian National Standard (SNI). F4 was the best treatment based on physical properties, proximate composition and sensory. Therefore, CPI could be used as an additive ingredient to increase colour, protein, and texture in kamaboko.
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Abstract Sangkuriang catfish (Clarias gariepinus var) is a freshwater commodity fish that has the potential to be developed. Sangkuriang catfish farming activities still often experience problems in their implementation, especially water quality problems in the form of a buildup of organic matter that does not decompose and causes poison to catfish. The determining factor of success in growing heterotrophic bacteria in aquaculture waters is the ratio of C/N in the tank of sangkuring catfish. This study aims to determine the C/N ratio, growth rate, and survival of catfish. The results showed that the addition of a C/N ratio of 10:1 has an effect on the growth, survival rate of catfish and can reduce the ammonia content in catfish culture media.
Clarias gariepinus
Carbon-to-nitrogen ratio
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