Weight Of Tilapia Research Articles

Pengaruh Proporsi Angkak (Red Mold Rice) Terhadap Karakteristik Fisikokimia dan Organoleptik Sosis Ikan Nila

The boiling process causes the color of the meat in the sausage to fade, so efforts are needed to improve the color of tilapia sausage using natural dyes that are safe for consumption. The addition of angkak was chosen for food coloring so that it can affect the level of consumer acceptance. The purpose of this study was to determine the effect of the addition of angkak proportion on the physicochemical characteristics and organoleptic score of tilapia sausage produced. The treatment added is the proportion of angkak which consists of 6 concentrations, namely 0%, 0.5%, 1%, 1.5%, 2% and 2.5% (% calculated from the total weight of tilapia and tapioca flour). The test parameters were water content, fat content, protein content, antioxidant activity, color intensity, hardness, and organoleptic test of taste, aroma, color, and texture. The best treatment was tilapia sausage with the addition of 1.5% angkak proportion (A3) with an average moisture content of 61.85%; protein 15.87%; fat 15.35%; antioxidant activity 40.49%; texture hardness 31.59 N; color intensity: brightness (L) 44.85; redness (a) 23.37; yellowness (b) 13.05; organoleptic: color 4.23 (red); taste 3.86 (moderately savory); aroma 2.63 (not fishy); texture 4.43 (chewy). Keywords: tilapia sausage, angkak

THE EFFECT OF LAMTORO LEAF FLOUR (Leucaena leucocephala) IN FEED ON THE GROWTH OF TILAPIA (Oreochromis niloticus)

Tilapia is favored for its rapid growth and adaptability to diverse aquatic environments, making it a widely cultivated fish. In fish farming activities, feed provides the largest contribution to the total production cost. So that farmers must use alternative feed to reduce feed costs. One alternative feed for tilapia that is easy to obtain, affordable and sustainably available is lamtoro leaves. The aim of this research was to determine the effect of adding lamtoro leaf flour to feed at different concentrations on the growth of tilapia (O. niloticus). The average weight of tilapia at the beginning of the study was 5,7 grams. This research was conducted for 40 days starting in May until June 2023, taking place in Kertayasa Village, Cijulang District, Pangandaran Regency. The method used in this research was an experimental method using a completely randomized design (CRD) with 4 treatments and 3 replications, namely treatment A: 100% commercial feed (control), treatment B: commercial feed + 5% lamtoro leaf flour, treatment C: commercial feed + 10% lamtoro leaf meal, and treatment D: commercial feed + 15% lamtoro leaf meal. Parameters observed included daily growth rate (SGR), absolute length growth, and water quality. The results indicated a significant effect (P<0.05) on the daily growth rate (SGR) by incorporating lamtoro leaf flour into the feed. The highest treatment, observed in treatment C at 50%/day, resulted in the maximum absolute length growth of 4.63 cm. The water quality parameters during the study were in the proper range for the life of tilapia (O. niloticus). Providing lamtoro leaf flour in feed does not have a negative effect on growth and water quality. Keywords: Tilapia fish, lamtoro leaf meal, growth.

Effect of Stocking Density and Diets Supplemented with Essential oils and or Probiotic on the Performance of Juveniles Nile tilapia (Oreochromis niloticus)

The present study was carried out to investigate the interactive effect of stocking density and diets supplemented with essential oils and or probiotic on the growth performance of juveniles Nile tilapia (Oreochromis niloticus), water quality parameters, intestinal morphology, and protection against Aeromonas hydrophila infection of Oreochromis niloticus. Total number of 640 O. niloticus fish (14.2 ± 0.95 g) were used in our work were allotted into eight groups with three replicates with two stocking densities (36 fish m-3 and 72 fish m-3) and four diets (control, Probiotic (Sanolife PRO-F®), Essential oils (EOs) blend (Super Immune®) and mix of Probiotic (Sanolife PRO-F®) and EOs blend (Super Immune®) respectively for 14 weeks and subsequently, challenged with A. hydrophila. The fish raised at the low stocking density exhibited increased weight gain, feed intake and specific growth rate compared with those raised at the high stocking density. Probiotic and/or EOs blend dietary supplementation improved Nile tilapia weight gain, daily gain, specific growth rate, total feed intake and feed conversion ratio. The water quality metrics' readings throughout the experiment all stayed within acceptable ranges for tilapia production despite the density increase. The fish raised at the low stocking density and received diet supplemented with mix of probiotic and EOs showed marked increased length of intestinal villi compared with the other groups. The EOs blend promoted better relative percent of survival with percentage of 100 % after challenge by A. hydrophila. It could be concluded that using EOs blend (Super Immune) and/or Probiotic (Sanolife PRO-F) as a dietary supplement for tilapia fingerlings would be a good choice due to their effective growth promoting, antibacterial effect and their positive impacts on fish intestinal morphology.

Evaluation of long-term operational and production performance of biofloc technology (BFT) system within various particle size

Biofloc technology (BFT) is a promising technique, but there has been ongoing debate between biofloc's properties and particle size. This study investigated the relationship between long-term particle size variation and the production performance of BFT aquaculture systems. External shearing force introduction could keep bioflocs at a smaller size level chronically, and 97% of smaller bioflocs were below 181.97 μm which was obviously lower than the normal size group (Control). No significant difference in the daily water treatment capacity for bioflocs within different particle size was detected (p > 0.05), but the activity of Soil-Dehydrogenase (S-DHA), Ammonia Monooxygenase (AMO), Hydroxylamine Oxidase (HAO) and Nitrite Oxidase (NOR) were all higher in smaller bioflocs. Smaller bioflocs were better enriched heavy metal elements and less damage to the gill lamellae was also detected in smaller size group. The survival rate and final mean weight of tilapia (Oreochromis niloticus) cultured in the BFT system based on smaller size bioflocs were significantly higher than the control (p < 0.05). The microbial compositions of varying particle sizes bioflocs demonstrated remarkable distinctions, and higher abundance of particle-attached bacteria (e.g., Flavobacteriaceae, Rhodobacteraceae) was detected in normal size bioflocs. Overall, this study comprehensively evaluated the long-term application of various particle size bioflocs and provided a practical basis for the sustainable BFT development.

Comparing the Suitable Different Protein Level and Economically Viable Feed for Tilapia (Oreochromis niloticus) Reared in Glass Tank at Bangladesh

Aims: Nile tilapia is one of the most consumable and economical fish species in Bangladesh, traditionally co-cultured by sharing with prawn, shrimp and Indian major carp. In tilapia monoculture, suitable protein level in the diet is crucial for better growth of the fish as well as being economically viable. Addressing this aspect, here in this experiment we tried to adopt suitable and economically sustainable feed for better tilapia growth and production.&#x0D; Place and Duration of Study: The experiment was carried out for 75 days in the wet laboratory of FMRT discipline of Khulna University.&#x0D; Methodology: Three available commercial feed with protein percentages of 32.5% (T1), 35% (T2) and 28% (T3) were fed to the juvenile tilapia (mean weight 0.31g) under the laboratory condition. Fish were nursed in rectangular glass aquaria tank (volume 25L) with each three replications for 75 days at the stocking density of 25fry/tank to determine the effect of these feed on growth of tilapia fry.&#x0D; Results: After 75 days culture period the final weight of tilapia under treatment T1 (4.68±0.28) were significantly (p&lt;0.05) higher than treatment T2 (4.01±0.19) and T3 (3.26±0.39). Similarly, the highest SGR was found in T1 followed by T2 and T3, however no significant difference observed among the treatments. FCR was significantly different among the treatment, where the lowest FCR was found in T1 and higher at T3. In contrary, PER was opposite to FCR values, higher in T1 and lower in T3. Again, significant different were observed in protein, lipid and ash content of tilapia among the three treatments. Water quality parameters were found at suitable farming ranges throughout the experimental period.&#x0D; Conclusion: The finding of this experiment suggested that 32.5% protein enriched feed can be suitable for the better growth of tilapia.

GROWTH PERFORMANCE OF TILAPIA (Oreochromis niloticus) SEEDS THROUGH THE ADDITION OF PAPAIN ENZYME

As a maritime country, Indonesia relies heavily on the aquaculture sector, including freshwater aquaculture. Freshwater aquaculture has been widely practised in the aquaculture of nila tilapia fish (Oreochromis niloticus). The obstacle that often arises in nila tilapia fish culture is the low growth of fish. Factors that cause low fish growth are the low ability of fish to digest the feed given. The papain enzyme can be used as a protein catalyst in feed, increasing growth rates and reducing production costs. This study was conducted from November to December 2022 at the Seberang Ulu 1 District, Palembang, South Sumatra. This study used an experimental method with treatment P0 being the control (without adding the papain enzyme) and P1 being the treatment with adding the papain enzyme at a dose of 2.25%. The P1 treatment produced the highest results: the absolute length growth of 3.49 cm, the absolute weight of tilapia of 9.8 g, feed efficiency of 98.30% and survival of 88.80%.

PENAMBAHAN TEPUNG RUMPUT LAUT EUCHEUMAA COTTONII HASIL FERMENTASI BIOFLOKULAN PADA PAKAN KOMERSIL IKAN NILA (Oreochormis niloticus)

This research aims to analyze the addition of Eucheuma cottonii sea weed flour from fermented bioflocculants on commercial food of tilapia (O. niloticus) feed. This research was conducted for 50 days at the Productionand Reproduction Laboratory of the Aquaculture Study Program, Department of Fisheries and Marine Sciences, Faculty of Agriculture, University of Mataram. This research used an experimental method with a completely randomized design (CRD) consisting of 4 treatment level sand 3 replications namely: P1 (commercial feed), P2 (90% commercial feed + 10% seaweed flour), P3 (80% commercial feed + 20% seaweed flour), P4 (70% commercial feed) + seaweed flour 30%). Parameters measured are the growth of data, absolute length, specific growth rate, feed efficiency, feed confersion, survival rate, water quality. The data was analyzed by using Analysis Of Variance (ANOVA) at 5% significance level. The Parameters that were significantly different were followed by the DUNCAN test at 5% significance level. Further more, The addition of E. Cottonii flour from bioflocculant fermentationto commercial feed can increase the absolute weight and absolute length of tilapia (O. niloticus), butdoes not affect the specific growth rate, efficiency of feed utilization, feed conversion ands urvival of tilapia (O. niloticus). The addition of 20% concentration of e. cottonii flour into commercial feed is the best treatment because it can increase the absolute length and weight of tilapia by 5,33 g and 5,30

Tilapia Weight Estimation System Using 2D Computer Vision

This study aimed to develop a Tilapia Weight Estimation System using 2D Computer Vision, for the AgriAqua Research and Technology Center located at Nanga, Pototan, Iloilo, Philippines.A system estimated the weight of live tilapia, and images were captured in a free-swimming aquarium. The study established the relationship between the fish's shape and its mass in order to estimate the weight of the fish. The dataset used in the system is composed of several tilapia images acquired from specimens with weights ranging from approximately 120-250 grams. As part of the evaluation, this study determined the accuracy of three regression models: Linear, Multiple, and Polynomial regressions in estimating the weight of a freely-swimming Tilapia. In addition to the R2 and P-value, the models were also compared in terms of RMSE, MAE, MARE, MXAE, and MXRE. The system’s quality was also evaluated according to the standards for computer software set by ISO 25010 International Quality Standards

Pengolahan Usaha Perikanan pada Produksi Benih Ikan Nila di Nagori Purwosari

Community service activities were carried out for 4 months in Nagori Purwosari, Pematang Bandar District, Simalungun Regency, which is about 124 km from the Nusantara Al Washliyah Muslim University Medan. The partner is a tilapia farming business owned by Mr. Anwar Ma'sum Saragih Farm. Tilapia (Oreochromis niloticus) is a freshwater fish that can be farmed. The purpose of this devotion is to recognize directly about the methods of tilapia farming. Tilapia farming activities are seed stocking, feeding, water quality management, oxygen content, harvesting and marketing. Stocked seeds measuring 1−2 cm by 100,000 heads. The dose of feed is 3% by weight of tilapia. The pond is filled with irrigation water and pam water. The salinity of the water is 20 ppt, the water quality includes water PH 6.5−8.6, water temperature 25°−30°C, dissolved oxygen 5 mg/L (ppm), ammonia content (NH3) 0.02 ppm, calm water discharge 8−15 L/s/ha, water quality is not cloudy and not polluted with harmful chemicals.

Tilapia growth performance and body physical index given synbiotic feed at different salinities

Tilapia saline is a fishery commodity with a fairly large market prospect but has problems with slow growth performance, affecting the speed of its production. This study aims to determine the best growth performance with the body’s physical index of tilapia at different salinities using the synbiotic feed. The synbiotic feed is given with probiotic Bacillus subtilis 105 CFU/mL density and banana flour prebiotic 1%. This study used five different salinity treatments (A. 0 ppt; B. 5 ppt; C. 10 ppt; D. 15 ppt; E. 20 ppt) with a weight of tilapia 3,35±0,5g each 20 fish/aquarium. The results showed that mortality, FCR, weight gain (WG), and feed efficiency showed significant results in the 15 ppt salinity treatment compared to other treatments. The HIS, DSI, and Condition Factor (K) values were not significantly different (P>0,05), but the IPF values were significantly different (P<0,05) from other treatments. The average treatment at 15 ppt salinity gave optimal growth performance and physical body index, especially IPF in tilapia fry.

Studi Literatur : Pengaruh Suhu terhadap Ikan Nila (Oreochromis niloticus)

Tilapia is one example of fish that is successfully cultivated in the world. Tilapia can live in deep and wide waters as well as in narrow and shallow ponds, and can live in rivers. The main environmental and management factors that affect the survival and growth of fish are dissolved oxygen levels, temperature, pH, feeding rate, and others. This study aims to determine the effect of temperature on tilapia (Orechromis niloticus). The method used in this research is a literature study (systematic review) by analyzing several scientific articles that are relevant to the study being discussed. The results of this study are known that temperature is very influential on several aspects of life, namely the level of survival, appetite, level of stability of the body for disease, growth rate, fish movement, viscosity and blood flow, oxygen consumption, leukocyte count, glucose level. in the blood, the number of erythrocytes, the number of platelets, the reaction of changing ammonium to ammonia, seed maintenance, tilapia weight, spermatogenesis stage in male individuals, hemoglobin concentration, feminization and masculinization of gonads, gastric evacuation rate, number of egg production, swimming speed, metabolic rate, response to feeding, the level of infertility in female fish, tilapia seed weight, fish stress level, the mechanism for determining the number of sex ratios, ovarian structure, and testicular structure. The conclusion of this study is that temperature greatly influences the life of tilapia (Oreochromis niloticus).

PENGARUH PENAMBAHAN EKSTRAK KUNYIT (Curcuma domestica Val.) PADA PAKAN TERHADAP PERTUMBUHAN IKAN NILA (Oreo chromis niloticus)

In the cultivation of tilapia (Oreochromis niloticus), there are still some obstacles or obstacles that farmers complain about, one of which is the high price of commercial feed, because one of the most important factors in cultivation is quality feed. Fish growth will increase if the feed given can be digested properly by fish so that the energy obtained by fish from feed can be utilized optimally. Therefore, with the background of some of the problems above, it is necessary to add natural feed in tilapia cultivation, with a nutritional composition that is in accordance with the needs of fish, this study was conducted with the aim of knowing the effect of adding natural feed in the form of turmeric extract as an immunostimulant that can trigger the growth of tilapia, as well as to determine the effect of differences in the concentration of turmeric extract added to each tilapia feed on the growth rate (weight and body length) of tilapia. This research was conducted through an experimental method, where the treatment given was in the form of adding turmeric extract with different concentrations to the artificial feed of tilapia. The results of this study proved that the higher the dose of turmeric extract added to the feed, the higher the growth rate of body length and weight of the tilapia. This is due to the balance of protein, and has the main content in the rhizome, namely essential oils and curcumin which can increase appetite, and also acts as an antioxidant.

Benefits in the Tilapia Growth, by Vetiver Grass in an Aquaponics System

Tilapia aquaculture has growing vertiginously in the world, reaching 7.02 million tons in 2020. In Mexico, the same year reached 72.6 thousand tons. This production values have increased environmental impact and production costs. In Mexico there is a pre-Hispanic aquaponics system, where people culture corn, bean fishes and other organisms. Taken this system as basis, the aim this work was demonstrate the benefits in tilapia aquaculture, by Vetiver grass. Three mini-ponds make up by tilapia juveniles and Vetiver in aquaponics system, and one mini-pond without Vetiver, were cultured during ten weeks. The ammonia, nitrates, dissolved O2, pH etc., and also tilapia weights were recorded along experiment. Results indicated that, ammonia decreased, nitrate increased and tilapia weight increased significantly in mini-ponds with Vetiver than without Vetiver. A von Bertalanffy simplified model was used to calculate time required for tilapias reached 500 g (commercial size) with Vetiver and without Vetiver; it was 48.6 and 54.4 weeks respectively. An extrapolation to commercial tilapia aquaculture, will decreased production cost, due to lower amount of feed and water in tilapia hatcheries; also, a lower environmental impact by wastes discharged to coastal ecosystems, e.g., the amount of ammonia produced in mini-ponds with Vetiver was 4.56 times less than mini-pond without Vitier at week ten. Moreover, tilapia culture with Vetiver, have an aggregated value, because Vetiver is used in perfumes production, reaching 45.2 billons US dollars in 2020.

EVALUASI LAJU PERTUMBUHAN DAN SINTASAN IKAN NILA (Oreocromis niloticus) YANG DIBUDIDAYA DALAM EMBER (BUDIKDAMBER)

Tilapia is a type of consumption fish that is very popular with the community, has an affordable price and is easy to cultivate. However, limited land for cultivation is one of the obstacles for the community in cultivating tilapia (Oreochromis niloticus). One alternative solution that needs to be done is the Budikdamber activity. Budikdamber is a method of cultivating fish in a limited space with high effectiveness if done intensively. The aim of this study was to evaluate the growth rate of tilapia (Oreochromis niloticus) and survival during the cultivation of damber activities. The results showed that tilapia fry (Oreochromis niloticus) cultured in buckets (budikdamber) for 6 weeks of rearing had a significant average increase in length and weight after the adaptive phase in the first and second weeks. The average increase in length and weight of tilapia during cultivation reached 1 cm/week, increased body weight of 20 grams/head and had a 100% survival rate.

An Experiment on Growth Performance, Specific Growth Rate (SGR) and Feed Conversion Ratio (FCR) of Rohu (Labeo rohita) and Tilapia (Oreochromis niloticus) in Tank Based Intensive Aquaculture System

The growth and survival are considered as the crucial factors that should be taken into consideration in any aquaculture system. The experiment was aimed to evaluate the growth performance and subsequent survival rate of the rohu (Labeo rohita) and tilapia (Oreochromis niloticus). It is important to evaluate the growth responses in relation to Feed Conversion Ratio (FCR) and assessment of the total production of the culture unit. As per the recommended stocking density of 320 fishes/decimal in intensive aquaculture system 8 fry per tank was released to assess the growth performance, survival and production of both rohu (T1) and tilapia (T2). During experimental period, there were three replications for each treatment and feed was supplied at the rate of 12%, 8%, and 4% of the body weight of rohu and 20%, 15%, and 10% of the body weight of tilapia in 1st, 2nd and 3rd month for T1 and T2, respectively. The initial weight of individual tilapia was 7.52±1.81 gm and 14.75±0.19 gm for T1 and T2, respectively. The mean final weight was 44.01±4.03 g for T1 and 139.94±1.29 for T2. The weight gains of fish were 36.49±4.09 gm and 125.19±1.29 gm for T1 and T2, respectively. The mean percent weight gain of tilapia was higher in T2 (1715.05±0.00) than T1 (485.23±0.00). The Specific Growth Rates (SGR) of T1 and T2 were found 4.98±2.28 and 6.26 ±3.83, respectively. There was significant difference (p&gt;0.05) in term of SGR between the treatments. Feed Conversion Ratio (FCR) in T1 and T2 were 2.86±0.14 and 2.23±0.18, respectively. Higher total production was obtained in T2 (1119.52 gm) than T1 (278.19 gm) with 100% survival in both the treatments. The water quality parameters for both of the species were within the suitable range. This study reveals a promising arena for fish culture in tank-based intensive aquaculture system as an efficient way of overcoming the scarcity of water and land. This culture system may be an excellent way of producing fish in a small parcel of land with securing the propitious production and expected outcomes within a limited period of time.

Analisa Limbah Fosfor Kegiatan Keramba Jaring Apung di Danau Laut Tawar Aceh Tengah

Floating net cage activities can cause water quality to decrease. The feed remains and the metabolism of the fish from these activities produces nitrogen and phosphorus . The objective of this study is to obtain the calculation model and the amount of phosphorus released into the waters of Laut Tawar Lake as a result of floating cage activities. The resulting formula was Pw = (F x [P]p) – ((It – Io) x [P]i), where their variables were given feed (F), phosphorus concentration of feed ([P]p), the final weight of fish (It), the initial weight of fish (Io), and phosphorus concentration in fishes ([P]i). It can be used to predict the increase in phosphorus waste based on the increase in floating net cage area. The weight of tilapia increases exponentially with the day of cultivation in the equation Y = 12.70e0.02x and the goldfish followed the formula Y = 2.28e0.03x. Phosphorus in tilapia varies from 1.58% to 2.23% with an average of 1.97%. Goldfish contain 1.19 - 2.02% phosphorus, with an average of 1.52%. Goldfish growth was not optimal due to inadequate feeding, so without excessive feeding and did not generate phosphorus waste. The cultivation of tilapia releases 0.09 Kg P/m2 of phosphorus waste from floating cages .

Investigations on the use of exopolysaccharide derived from mycelial extract of Ganoderma lucidum as functional feed ingredient for aquaculture-farmed red hybrid Tilapia (Oreochromis sp.)

There is growing interest in medicinal fungi for promoting immunomodulation benefits in humans and animals. In this study, exopolysaccharide (EPS) from Ganoderma lucidum was used in feed (EFF) on production of farmed-red hybrid Tilapia performance for sustainable aquaculture. The feeding trial was conducted for a period of 42 days. Tilapia weight gain (WG) was significantly the highest (18.75 ± 0.03 g/fish) using 3 g/kg of EFF compared to control (0 g/kg EFF; 12.4 g/fish). Fish fed with 3 g/kg of EFF were shown to be healthiest as attested by measured organosomatic indices that achieved an hepatosomatic index (HSI) of 2.22% and condition factor (CF) of 1.46% compared to control (1.97% HSI; 1.60 CF). Antioxidant activity of Glutathione S-transferase (GST) exhibited significantly lower activities in 1 and 2 g/kg of EFF while increasing catalase (CAT) activity was detected in higher EFF (2-3 g/kg of EPS). Muscle compositions were not affected by the EFF feeding regimes. In contrast, EFF feeding produced significantly higher haemoglobin (7.43 g/dl), haematocrit (37.5%), red blood cell (2.69 106/mm3), and white blood cell (176.7 106/mm3) compared to control group. In summary, EFF was beneficial in promoting growth, stimulating antioxidant enzymes, and health status of red hybrid Tilapia, which highlights the potential for future use in intensive sustainable aquaculture practices.

Comparative Study of the Weight Gain Performance of Two Tilapia Strains in Western Democratic Republic of Congo

AbstractTilapia is one of the main fish of livestock in Africa. However, despite the potential of exploitation that offers this fish breeding seems not yet mastered in sub-Saharan Africa. The West of the DRC specifically in the provinces of Congo-Central, Kwango and Kwilu, tilapia is the main species of livestock. To answer the question whether the low weight of tilapia in the West of the DRC was due to a genetic degeneration or simply the wrong system of breeding, we have introduced a new strain of tilapia that we compared with the strain local. Both strains were fed on basis of the internal are with a complement of 25 kg/ha of concentrated feed (18% PD) and 50 kg/ha of the droppings of chickens every 10 days. The average weight of 85,94 g; 150,18 g and 182,28 g were obtained with the local strain respectively at 3, 6 and 9 months. While with the introduced strain, the average weight of 83,34 g; 149,12 g and 218,22 g were observed. The ANOVA showed that the differences are significant. At the end of our investigation, it is clear that the very low weight of tilapia produced by peasant farmers in the West of the DRC are due to the use of inadequate nutritional practices. Nutrition is currently the limiting factor for performance of tilapia farming in the West of the DRC.

Effects of different feed doses of Majapahit leaves (Crescentia cujete L.) on the growth of Nile tilapia (Oreochromis niloticus)

Phytochemical test results of Majapahit leaf extract contain active ingredients saponins, tannins, steroids and triterpenoids which have in vitro potential as antibacterial and from the results of GCMS analysis in previous studies. Majapahit leaves contain active ingredients such as 2-Methoxyl4-vinylpheol, Thiosulfuric acid, Octadec9-enoicacid, n-Hexadeconoic acid which has the potential as an antibacterial insilico. This study aims to determine the effect of the addition of Majapahit leaf powder (Crescentiacujete L.) in feed with different doses to the growth of tilapia (Oreochromis niloticus) The parameters observed in this study were the growth of tilapia weight by treating different doses of majapahit leaf powder with doses A (7.5%), B (10%), C (12.5%) and D (0%). To find out the weight of the fish, sampling was done every 5 days. The results showed the best absolute weight growth in treatment C (12.5%) which was 21.33 g higher than the control treatment which was 10.33 g.

FALHAS DE MANEJO NA FASE DE ENGORDA DE TILÁPIAS E SUA RELAÇÃO COM A DISPARIDADE DE PESO FINAL

O presente estudo foi realizado na região Oeste do Paraná, considerada o polo agropecuário da produção de peixes do Estado, região que concentra 17 frigoríficos de abate e industrialização de pescados, tem como objetivo informar o produtor em relação à engorda do lote, bem como sobre as análises da qualidade da água do viveiro com o intuito de verificar as falhas de manejo que contribuem para a disparidade de tamanho final dos peixes. Durante cinco meses (out/18 a fev/19) foram monitorados seis viveiros em quatro pequenas propriedades localizadas no município de Toledo-PR. Para a biometria foram utilizadas amostragens com 50 indivíduos por viveiro, pesados e medidos individualmente. A disparidade de peso foi calculada utilizando-se o desvio padrão amostral de cada lote. A sonda multiparâmetros foi utilizada para mensurar: temperatura, pH, condutividade elétrica, sólidos totais dissolvidos, oxigênio dissolvido e turbidez. Os resultados demonstraram forte correlação entre turbidez, sólidos totais dissolvidos e condutividade elétrica com a disparidade de tamanho das tilápias. Foi observado superlotação dos viveiros. O desvio padrão de peso aumentou à medida que os peixes cresceram. Conclui-se que a qualidade da água afeta diretamente o desenvolvimento dos peixes e a falta de manejo adequado deste ambiente, contribui para com o aumento da disparidade de peso e tamanho das tilápias.