Energetic Performance Assessment of a Thermo-Solar Greenhouse Fish (Nile Tilapia) Hatchery

Kassem, Mona Morgan; Elsbaay, A. M.; AbouZaher, Said E.; Abdelmotaleb, I. A.

doi:10.21608/mjae.2016.97625

Cited by 1 publication

(2 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The fact that the greenhouse in this study heated the surface of the water directly below it suggests that this is an effective method of introducing a thermal gradient in an inland fish earthen pond, which is line with other studies on this topic (Kassem et al, 2016;Nzula et al, 2020). Given the established link between higher temperatures and higher photosynthetic activity, the reason dissolved oxygen concentrations (DO) were higher under the greenhouse than outside could be a result of higher photosynthetic activity associated with the higher temperatures under the greenhouse.…”

Section: Discussionsupporting

confidence: 90%

“…A typical greenhouse consists of a concave-shaped structure of galvanised iron covered by a film of transparent ultraviolet low-density polyethylene (LDPE; Kassem et al, 2016). This structure helps to retain the solar heat and can raise water temperature by 3 -4 °C inside and underneath the greenhouse compared to the external temperature, thereby theoretically allowing fish to express their natural thermoregulatory behaviour in the face of disease (Zhu et al, 1998).…”

Section: )mentioning

confidence: 99%

See 1 more Smart Citation

Modifying the Design of Pond Production Systems can Improve the Health and Welfare of Farmed Nile Tilapia, <em>Oreochromis niloticus</em>

Emam¹

2023

Preprint

View full text Add to dashboard Cite

Infected fish have been known to recover from mild illness when they are able to locate to warmer water. This study aimed to replicate this ‘behavioural fever’ effect in an aquaculture setting by artificially heating a section of a fish pond (thereby introducing a thermal gradient) and effectively modifying pond design. This was achieved through the construction of a ‘greenhouse’ type structure above a section of the pond. Over the length of the production cycle at three typical Nile tilapia (Oreochromis niloticus) farms, the study collected data on water quality and fish growth and at the end of the cycle, blood samples were taken and total production was recorded. At each farm, fish were divided into two identical ponds, one with a greenhouse covering 3% of the pond surface area and one without. Results showed that greenhouse was effective in warming the surface of the water immediately below it. Oxygen levels were also higher under the greenhouse than outside of it and higher than in the control pond. Fish reared in the greenhouse ponds tended to be larger than the control ponds and had improved physiological and immune status (i.e., better liver and kidney function, higher antioxidant activity and lysozyme count; p &lt; 0.05). The results of this study suggest that low-cost interventions that introduce thermal gradients in aquaculture systems may hold promise for improving health and welfare status of farmed fish in developing countries.

show abstract

Section: Discussionsupporting

confidence: 90%

Section: )mentioning

confidence: 99%