A Stage-Structured Fishery Model for African Catfish and Nile Tilapia Feeding on Two Food Resources with Harvesting

Nankinga, L.; Luboobi, Livingstone S.; Mugisha, Johnny; Nannyonga, Betty; Carlsson, Lennart

doi:10.1155/2022/4112015

Cited by 3 publications

(4 citation statements)

References 51 publications

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“…Conversely, the costs of vegetable oil, vitamin-mineral premix, and starch did not exhibit significant differences across the treatments. The mean total cost of feed ingredients (TFI) per treatment also displayed significant differences (P>0.05), with the highest total cost observed in the pearson square treatment 1221.23±23.94 and the lowest total cost in the AQUAFEED treatment 911.70±14.75, Nankinga et al [7] made a similar observation in their research on tilapia feeding.…”

Section: Growth Performance and Nutrient Utilization Of Clarias Garie...mentioning

confidence: 70%

“…Feeding catfish with nutritionally balanced feeds helps bolster their immune systems, making them more resistant to diseases and stress. Proper nutrition can reduce the need for antibiotics and other treatments, contributing to a healthier and more sustainable farming system [7]. Advanced software tools are available for formulating catfish feeds.…”

Section: Introductionmentioning

confidence: 99%

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Comparative Assessment Studies on Different Feed Formulation Methods with Novel Aquafeed Software in African Catfish, Clarias gariepinus (Burchell 1822) Farming in Earthen Ponds

Adesuyi O. D.,

Gbadamonsi O. K.,

Oladipupo T. M.

2023

AJFAR

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This study investigates the impact of a novel Aquafeed software system on the growth, nutrient utilization, and economic feasibility of production African catfish, Clarias Gariepinus, in earthen ponds. Being a critical species for aquaculture in many continents, optimizing feed management is essential for enhancing productivity and sustainability. Fifty (50) apparently healthy Clarias gariepinus fingerlings weighing (6.50-7.00 g) was allotted into each of the nine hapas and fed for a period of 72 days. During the experimental period, water quality parameters were meticulously monitored to ensure optimal conditions for the growth of Clarias gariepinus. The nutrient composition of the fish carcasses, including crude protein, lipid, ash, moisture, and nitrogen-free extract, were analyzed in to assess their nutritional status. The results revealed that the implementation of the novel FUTA Aquafeed software significantly enhanced the growth and nutrient utilization of Clarias gariepinus fingerlings at (p<0.05) when compared to traditional formulation methods of Pearson square and Winfeed. This software- driven approach provides a more precise and tailored feeding regimen, resulting in improved fish performance. A comprehensive cost analysis underscores the economic advantages of utilizing the Aquafeed software. It demonstrates that the software not only contributes to enhanced fish growth but also reduces production costs, thus improving the overall economic viability of Clarias gariepinus aquaculture in earthen ponds. Aquafeed has the highest amount of water molecule of 14.43%, Protein content of 44.01% for auqafeed, Lipid content from the analyzed result state 19.21% for aquafeed, ash recorded, 17.01%, 17.79% and 16.15% for pearson, and aquafeed respectively, while fiber accumulate 0.63%, 0.78%. 1.00% pearson, windfeed and aquafeed respectively. Nitrogen Free Extract dwindle between 7.50 and 5.09%, all these buttress the fact the FUTA Aquafeeds has better performance than two others.

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Section: Growth Performance and Nutrient Utilization Of Clarias Garie...mentioning

confidence: 70%

Section: Introductionmentioning

confidence: 99%

Comparative Assessment Studies on Different Feed Formulation Methods with Novel Aquafeed Software in African Catfish, Clarias gariepinus (Burchell 1822) Farming in Earthen Ponds

Adesuyi O. D.,

Gbadamonsi O. K.,

Oladipupo T. M.

2023

AJFAR

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“…We would like to note that a shift in the size structured toward adult individuals, as harvesting was enhanced, may occur if the proportionality constant of ingestion is greater than one; see de Roos et al [12]. This phenomenon may also occur if adult individuals cannibalize on the juveniles; see, e.g., Soudijn and de Roos [11] and Nankinga et al [47].…”

Section: Conclusion and Discussionmentioning

confidence: 99%

Properties in Stage-Structured Population Models with Deterministic and Stochastic Resource Growth

Aye

Carlsson

2022

Journal of Applied Mathematics

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Modelling population dynamics in ecological systems reveals properties that are difficult to find by empirical means, such as the probability that a population will go extinct when it is exposed to harvesting. To study these properties, we use an aquatic ecological system containing one fish species and an underlying resource as our models. In particular, we study a class of stage-structured population systems with and without starvation. In these models, we study the resilience, the recovery potential, and the probability of extinction and show how these properties are affected by different harvesting rates, both in a deterministic and stochastic setting. In the stochastic setting, we develop methods for deriving estimates of these properties. We estimate the expected outcome of emergent population properties in our models, as well as measures of dispersion. In particular, two different approaches for estimating the probability of extinction are developed. We also construct a method to determine the recovery potential of a species that is introduced in a virgin environment.

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“…The African catfish ( Clarias gariepinus ; Family Cyprinidae) and the Nile tilapia ( Oreochromis niloticus ; Family Cichilidae) are among the most important freshwater fisheries and aquaculture species in Africa (El‐Sayed & Fitzsimmons, 2023; Munguti et al, 2022; Munguti & Iteba, 2022; Nankinga et al, 2022). The two species have been cultured together under mixed‐species (polyculture) farming (Mandal et al, 2014; Shoko et al, 2015).…”

Section: Fish Breedingmentioning

confidence: 99%

The potential impact of aquaculture on the genetic diversity and conservation of wild fish in sub‐Saharan Africa

Sanda,

Metcalfe,

Mable

2024

Aquatic Conservation

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An increasing focus on aquaculture using introduced strains or species poses a serious threat to native wild species in sub‐Saharan Africa, yet almost no policies have been enacted or regulations put in place to address this environmental challenge. Aquaculture in these regions has traditionally been conducted on a relatively small scale but is currently expanding rapidly and is projected to continue increasing in the coming decades, with increasing use of genetically improved strains. This expansion is occurring in a region known for its high biodiversity, creating challenges for increasing fish production without damaging wild fish populations. However, few studies have yet assessed the impacts of changes in aquaculture practice on the genetic composition and diversity of wild populations. The use of non‐native improved strains for aquaculture could cause competition, gene introgression when there is interbreeding with native populations or species, displacement of species and possible extinction of the native wild populations. After providing historical context on African aquaculture, this review describes the current methods of fish breeding and genetic improvement programmes for the main species of cultured fishes, focusing on the potential conservation impacts of the use of introduced (and selectively bred) farmed species. Existing aquaculture policies, legislation and regulations regarding the import and farming of fish are then compared across the main fish‐producing countries. We recommend a regional policy framework considering fish introduction, risk analysis and risk management, human resources development and genetic monitoring that could be drafted into the existing policies to strengthen conservation efforts. We conclude by making recommendations for refining existing regulations and for future research aimed at minimizing the impacts of aquaculture on wild fish populations in sub‐Saharan Africa. Aquaculture in this region needs implementation of responsible guidelines to avoid genetic impacts on native populations of high conservation value.

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A Stage-Structured Fishery Model for African Catfish and Nile Tilapia Feeding on Two Food Resources with Harvesting

Cited by 3 publications

References 51 publications

Comparative Assessment Studies on Different Feed Formulation Methods with Novel Aquafeed Software in African Catfish, Clarias gariepinus (Burchell 1822) Farming in Earthen Ponds

Comparative Assessment Studies on Different Feed Formulation Methods with Novel Aquafeed Software in African Catfish, Clarias gariepinus (Burchell 1822) Farming in Earthen Ponds

Properties in Stage-Structured Population Models with Deterministic and Stochastic Resource Growth

The potential impact of aquaculture on the genetic diversity and conservation of wild fish in sub‐Saharan Africa

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