Table 5 - uploaded by Widanarni Widanarni
Content may be subject to copyright.
Source publication
This research was conducted to find the best stocking density in combination with water exchange level in order to increase the productivity of corydoras (Corydoras aeneus). Corydoras at the initial body weight of 0.44-0.51 g and total body length of 2.20-2.31 cm were used in this research. The research was conducted in two-factor factorial design....
Contexts in source publication
Context 1
... stocking density was a critical factor because it was potential to become a stress inducer, shown by the level of cortisol and blood glucose (Tables 4 and 5). Body cortisol level in corydoras fish at day-20 has shown significant difference among treatments. ...
Context 2
... and glucose levels in this study tended to increase along with density increase and low water exchange at 50%. Nevertheless, it was seen that corydoras fish was able to adapt to the time in which during all treatments, cortisol levels increased until day-20 and then decreased at day-40 (Tables 4 and 5). Several results of previous studies generate cortisol levels before the stress and after stress in carp (Cyprinus carpio) at 7.4 ng mL -1 and 79 ng mL -1 , in rainbow trout (Onchorhynchus mykiss) at 1.7 ng mL -1 and 43 ng mL -1 , and in salmon (Salmo trutta) at 1 ng mL -1 and 94 ng mL -1 (Barton 2002). ...
Similar publications
This work evaluates the growth and body development of Oreochromis niloticus in floating cages in the Toho Lake of Benin. Thus, 6000 juvenile monosex male with an average initial weight of 8.87 ± 4.89 g and average initial total length of 7.87 ± 1.43 cm were randomly distributed in two floating cages (5 x 5 x 2.5 m3) at the stocking density of 3000...
Citations
... High water exchange is required to maintain water quality at high densities (Appleford et al., 2012). Water exchanges maintain water quality by removing excessive nitrogenous waste, and the rates depend on the food input to the system which can range from 30% to over 100% (Weidner and Rosenberry, 1992;Lorenzen, 1999;Diatin et al., 2015). However, this is not necessarily the most sustainable system due to the discharge of aquaculture effluent. ...
Catfish farming has long been carried out by local farmers with various systems and technologies. A reduction of land and water availability in urban aquaculture has been stimulate the application of aquaponic and biofloc technology. In this study, we aimed to analyze production performance, financial feasibility, and sensitivity analysis in catfish farming through a different farm system including water exchange system, aquaponic and biofloc technology. A case study was used from catfish (Clarias gariepinus) farmers in Bogor, West Java, Indonesia. The production performance analyzed is the total production, productivity and survival. Financial feasibility analysis used cost-benefit analysis (CBA) and sensitivity analysis is carried out on changes in the amount of production based on the survival value. The results showed that the best productivity of catfish was obtained from a water exchange system with a production value of 4038.0 ± 6.0 kg, productivity 168.0±2.0 kg per m², and the survival of 79.4±2.2%. The financial feasibility analysis suggested that the water exchange system was US 5048.3 6 (NPV), 12.57 (BCR) and 303.48% (IRR). and for biofloc technology was US$ 2242.23 (NPV), 7.67 (BCR), and 184.07% (IRR), analysis period was five years. The sensitivity analysis shows that the limit of reduction in survival value in water exchange catfish culture, aquaponic, and biofloc technology are 64.0%, 60.0% and 64.0% respectively. Our study showed that the production and financial performance of catfish farming using biofloc technology produces the lowest value compared to the other two systems. It was found that the farmers have not implemented the biofloc technology procedures correctly and have not routinely monitored water quality in all systems and technologies. Still, we were able to aknowledge this issue in hope that we can fix it in the future.
... Biofloc technology application in ornamental fish had been reported on goldfish (Faizullah et al., 2015;Wang et al., 2015), gibel carp Carassius auratus gibelio (Qiao et al., 2018), Pelteobagrus vachelli fish , and fin barb hybrid lemon fish (Dauda et al., 2018b). Previous experiment of the intensive corydoras fish culture with high density has been performed on the water exchange system with 30%/day and produces the best survival rate with 25 fish/L stocking density, equivalent to 3750 fish/ m 2 (Diatin et al., 2014) and 4500 fish/m 2 using 100%/day water exchange (Diatin et al., 2015). ...
... The experiment performed by a randomized design method with three treatments and three replications. Treatments given in this study were different stocking densities of corydoras fish on the fish culture using biofloc technology, namely 3000 fish/m 2 (BFT3000), 4500 fish/m 2 (BFT4500), and 6000 fish/m 2 (BFT6000), referred to Diatin et al. (2015). The fish density on each aquarium treatment was 120, 180, and 240 fish. ...
Ornamental fish is non consumption fish which is an important source of Indonesian foreign exchange. The objective of this study is to analyze the productivity of bronze corydoras Corydoras aeneus ornamental fish through increased stocking density with biofloc technology. The average weight of the experimental corydoras was 0.61 ‒0.72 g with 2.32‒2.40 cm standard length. This study used a randomized design method with biofloc technology treatment in 3000, 4500, and 6000 fish/m2 stocking densities. The results showed that the daily length and weight-growth rate among treatments were not significantly different (P>0.05), while survival rate and the number of fish production on all treatments were significantly different (P0,05), sedangkan kelangsungan hidup dan jumlah produksi ikan pada semua perlakuan berbeda nyata (P
... In the present study we showed that C. aeneus massively consumed adults of different free-living nematode species dwelling sandy sediment. Since Diatin et al. (2015) reported a wet weight of 440-510 mg for C. aeneus individuals measuring 22-23 mm, the predator-prey ratio in our study could be estimated at ca. 5 orders of magnitude, and the daily consumption of nematodes could be roughly estimated to represent between ca. 14 and 54% of C. aeneus individual biomass. We are aware that this estimation is probably overestimating the strength of the Corydoras-nematode trophic transfer occurring in the field, because it is based on optimal laboratory conditions (e.g. ...
... C. aeneus is a popular ornamental fish, so conditions for its culture are of commercial interest (e.g. Diatin et al., 2015). Among the four species of nematodes offered, Panagrolaimus cf. ...
In this study, we measured the daily consumption of four different nematode species by a small freshwater catfish species, Corydoras aeneus (Gill, 1858). Consumption of nematodes by fishes was significant with a single C. aeneus individual being able to consume in 24 h between 40 581 and 75 849 adult nematodes depending on the nematode species offered. This represented the ingestion of up to 238 mg wet weight when considering the largest nematode species: Panagrellus redivivus. Our results strengthen the growing evidence of a significant trophic channel existing between meiobenthic invertebrates like nematodes and small bottom-feeding fishes like C. aeneus. We also discuss the relevance of using P. redivivus as live food for rearing C. aeneus which is a popular ornamental fish.
... According to Ako et al (2005) and Aksungur et al (2007) stocking density represents an important factor which determines the economic viability of production systems. Generally, the mechanisms by which stocking density affects the growth and feed efficiency are controversial, being influenced by the fish species (Ellis et al 2002), age and size, their behavior under conditions of high density, intensity of feeding and water quality (Rafatnezhad & Falahatkar 2011;Luo et al 2013;Diatin et al 2015). The results of the present study indicated that stocking density of 14.95 kg m -3 and 10.74 kg m -3 improved the bester growth and feed utilization compared to stocking density of 4.56 kg m -3 and 3.19 kg m -3 . ...
The aim of this paper was to evaluate the influence of different stocking densities on growth performance of the hybrid bester sturgeons (Huso huso ♂ x Acipenser ruthenus ♀), reared in a recirculating aquaculture system. A number of 300 hybrid bester with an average weight of 76.6±5.36 g were randomly divided into four rearing units in order to create different stocking densities: V1-14.95 kg m-3 ; V2-10.74 kg m-3 ; V3-4.56 kg m-3 and V4-3.19 kg m-3. Researches were conducted between October 20th, 2015 and November 18th, 2015, in the recirculating system of the Aquaculture, Environmental Science and Cadastre Department, University of Galati. The fish were fed with commercial STECO PRE GROWER-14–extruded pellets for sturgeons with a protein content of 50% and a fat content of 14%, the feeding intensity being 1.6% from body weight (BW) per day. At the end of the experiment, specific growth rate (SGR) calculated in V1 variant was 1.58% g day-1 , in V2-1.56% g day-1 , V3-1.40% g day-1 and V4-1.55% g day-1. The best body weight was obtained in the group V2 followed by V1, where was the highest stocking density. The fish from these groups achieved an individual weight gain of 46.73 g/ind and 42.97 g/ind. Mortality was positively correlated with stocking density.
Aquaculture is a crucial industry that can help meet the increasing demand for aquatic protein products and provide employment opportunities in coastal areas and beyond. If incorrectly manage, traditional aquaculture methods can have negative impacts on the environment and natural resources, including water pollution and overuse of wild fish stocks as aquafeed ingredients. Biofloc technology (BFT) may offer a promising solution to some of these challenges by promoting a cleaner and sustainable production system. BFT converts waste into bioflocs, which serve as a natural food source for fish and shrimp within the culture system, reducing the need for external inputs, such as feed and chemicals. Moreover, BFT has the potential to improve yields and economic performance while promoting efficient resource utilization, such as water and energy. Despite its numerous advantages, BFT presents several challenges, such as high energy demand, high initial/running costs, waste (effluent, suspended solids, and sludge) management, opportunistic pathogens (vibrio) spread, and a lack of understanding of operational/aquatic/microbial dynamics. However, with further training, research, and innovation, these challenges can be overcome, and BFT can become a more widely understood and adopted technique, acting as an effective method for sustainable aquaculture. In summary, BFT offers a cleaner production option that promotes circularity practices while enhancing performance and economic benefits. This technique has the potential to address several challenges faced by the aquaculture industry while ensuring its continued growth and protecting the environment. A more broad BFT adoption can contribute to meeting the increasing demand for aquaculture products while reducing the industry’s negative impact on the environment and natural resources. In this context, this review provides an overview of the advantages and challenges of BFT and highlights key technical, biological, and economic aspects to optimize its application, promote further adoption, and overcome the current challenges.
