Technical and economic feasibility of food strategies in the hatchery of Cyprinus carpio (Cypriniformes, Cyprinidae) in a recirculating aquaculture system

Motta, Jonas Henrique de Souza; Júnior, Manuel Vázquez Vidal; Glória, Leonardo Siqueira; Neto, Manoel Adriano Cruz; Silveira, Leonardo Serafim da; Andrade, Dálcio Ricardo de

doi:10.3856/vol47-issue4-fulltext-5

Cited by 4 publications

(1 citation statement)

References 25 publications

(39 reference statements)

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“…Once the fry was able to open its mouth, nauplii of newly hatched Artemia saline were offered for observation of the first exogenous feeding. The method described by Motta et al (2019) was used for the hatching of artemia cysts. The presence of food in the gastrointestinal tract was evaluated by examining the larvae under an optical microscope.…”

Section: Brazilian Journal Ofmentioning

confidence: 99%

Effect of temperature on embryonic development and first exogenous feeding of goldfish Carassius auratus (Linnaeus, 1758)

et al. 2023

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Goldfish or Kinguio is a widely marketed species worldwide due to the ornamental market. There is some lack of acknowledgment of the production of the species under specific climatic conditions. To evaluate the effect of temperature on embryonic development and the first exogenous feeding of goldfish, an experiment was proposed. Fifteen incubators, organized in five treatments (18, 22, 26, 30, and 34 °C) with three replications each, were used to keep the fertilized goldfish eggs until the first exogenous feeding of the larvae. The main development events were observed to understand the possible effects of these temperatures on embryos and larvae of the species. Temperature influences embryo development and the time of first exogenous feeding of goldfish. The temperature of 34 °C was lethal to the species causing 100% of anomalies in the embryos and larvae. The experiment data allow us to conclude that the species presents a maximum thermal limit during embryogenesis, and these data are important to the aquaculture industry and to understand the effect of climate changes on goldfish. The data obtained in this experiment will assist in the management of invasive species and production of the species (aquaculture).

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Section: Brazilian Journal Ofmentioning

confidence: 99%

Effect of temperature on embryonic development and first exogenous feeding of goldfish Carassius auratus (Linnaeus, 1758)

et al. 2023

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Feeding protocol with live feed and inert diet to determine the ideal age/size for weaning mullet Mugil liza (Valenciennes, 1836)

de Azevedo Manhães,

da Silva,

Brasil

et al. 2024

Journal of Fish Biology

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The Lebranche mullet Mugil liza is a marine fish of great importance for artisanal and industrial fishing, as well as aquaculture. The use of live feeds during the larviculture phase of marine fish is a significant component of production costs. The present study evaluated the effects of the feeding transition on different larval stages of M. liza, from the combined supply of live feed (Brachionus rotundiformis + Artemia franciscana) and live + inert feed (Artemia franciscana + inert diet) until the weaning phase to only the inert diet. A total of 3240 M. liza larvae (weight 0.0133 ± 0.0062 g and length 0.793 ± 0.160 cm) were distributed among the 12 experimental units (n = 270), resulting in four groups with three replicates each. Treatment groups consisted of feed transition with A. franciscana (enriched metanauplii) to commercial inert feed starting weaning at four different larval ages: 28, 31, 34, and 37 days post hatching. Zootechnical performance indexes and intestinal histomorphometry were evaluated. Mortality, condition factor, and length variation coefficient did not show significant differences between treatments. Final weight, final length, weight gain, and length gain were significantly greater in larvae that started weaning at 31, 34, and 37 days post hatching. Weight coefficient of variation was significantly higher in larvae that started weaning at 28 days (67.51 ± 11.70) compared to 37 days (34.40 ± 7.30). In intestinal histology, villi height (180.3 ± 4.4) was significantly higher in larvae that started weaning at 37 days post hatching. Considering the evidence found in the present study, it is recommended to start weaning M. liza on the 31st day post‐hatching, using a 2‐day co‐feeding protocol (31st and 32nd days). From the 33rd day after hatching, M. liza larvae can receive only commercial feed.

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Economic Analysis and Improvement Opportunities of African Catfish (Clarias gariepinus) Aquaculture in Northern Germany

Pasch

Palm

2021

Sustainability

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A farmland based African Catfish recirculation aquaculture system with a production volume (PV) of 300 m3 was modelled under realistic market conditions in order to analyse the impact of price fluctuations on profitability. As a monoculture recirculating aquaculture system (RAS) for whole fish and the wholesaler’s market, the model northern German catfish aquaculture is currently gainless, but the production is sufficient to cover all costs. The most decisive economic parameter is the low selling price (2.20 EUR/kg whole fish), which affects the returns by ±70,463 EUR/year for every ten percent (0.22 EUR) price change. Among the variable costs, feed has by far the largest impact with a share of 61.4% (42.1% of total costs). Based on the initial model every ten percent price variation of this variable input factor changes the returns by ±29,691 EUR/year, followed by energy (±5913 EUR/year), fingerlings (±4804 EUR/year), wages (±3972 EUR/year) and water (±2464 EUR/year). Larger system sizes (600 m3 PV) significantly save costs due to economies of scale and achieve returns of 175,240 EUR/year and an ROI of 11.45%. Increasing max. stocking density from 450 kg/m3 to 550 kg/m3 improves returns and ROI (40,379 EUR/year; 4.40%), but also involves higher production risks. An own fingerling production with a production of 300% above the own requirements improves returns and ROI (39,871 EUR/year; 3.57%) and leads, above all, to independence from foreign suppliers. Aquaponic integrations can generate profits, but are associated with high investment costs and the challenges of entering a new business sector. Product diversification into fillet (50% of the production) and smoked fillet (30%) generates lucrative returns and ROI (212,198 EUR/year; 20.10%). Profitability is further increased by direct marketing in the form of a farm store and the establishment of a regional “producer organisation”. Our results demonstrate that under current market conditions northern German catfish aquaculture covers all costs, mainly increasing profitability through altered sales prices and feed costs. Retaining a larger part of the fishery value chain within the farm through additional benefits, further processing and product diversification improves profitability, making African catfish RAS a sustainable and economically profitable aquaculture business in Germany.

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Technical and economic feasibility of food strategies in the hatchery of Cyprinus carpio (Cypriniformes, Cyprinidae) in a recirculating aquaculture system

Cited by 4 publications

References 25 publications

Effect of temperature on embryonic development and first exogenous feeding of goldfish Carassius auratus (Linnaeus, 1758)

Effect of temperature on embryonic development and first exogenous feeding of goldfish Carassius auratus (Linnaeus, 1758)

Feeding protocol with live feed and inert diet to determine the ideal age/size for weaning mullet Mugil liza (Valenciennes, 1836)

Economic Analysis and Improvement Opportunities of African Catfish (Clarias gariepinus) Aquaculture in Northern Germany

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