Comparing Meat and Skin of Two Enhanced Farmed Tilapia Types

Greg Howard
24th February, 2025

Comparing Meat and Skin of Two Enhanced Farmed Tilapia Types

Nile Tilapia (Oreochromis niloticus)

Photo adapted from: Jackson Hu / CC BY (Source)

Key Findings

  • In Brazil, researchers discovered that red GIFT tilapia have better muscle quality and higher antioxidant levels, enhancing their shelf life and nutritional value
  • Black GIFT tilapia possess stronger skin, making them more durable and less prone to damage during processing and handling
  • Genetic differences related to skin color can guide breeding programs to optimize tilapia varieties for specific commercial purposes
Tilapia is one of the most widely farmed fish species globally, prized for its adaptability and economic value. Among the various strains, Genetically Improved Farmed Tilapia (GIFT) stands out due to its enhanced production and commercial traits[1]. A key characteristic that distinguishes different tilapia varieties is skin color, which not only affects the fish's marketability but also relates to underlying biological processes. Understanding the relationship between skin color and other phenotypic traits can lead to better breeding strategies and optimize the quality of tilapia products. A recent study conducted by researchers at the Federal University of Sergipe explored the differences in fillet and skin characteristics between black and red skin phenotypes of GIFT Nile tilapia. The study involved 24 GIFT Nile tilapia from the same spawning stock, divided into two groups based on their skin color. The researchers meticulously measured various biometric parameters and found no significant differences between the black and red varieties, indicating that both groups were comparable in size and overall health. However, when examining the biochemical and physical properties of the fish, notable differences emerged. The red variety exhibited higher pH levels two hours after slaughter, which is an indicator of better muscle quality and shelf life. Additionally, red tilapia demonstrated greater muscle antioxidant capacity, which helps in reducing oxidative stress and improving the nutritional quality of the fillet. In contrast, the black variety showed superior physical properties in terms of skin strength. Tests revealed that black tilapia skin could withstand greater force during tearing and exhibited higher tensile strength, deformation, and elongation compared to the red variety. These physical attributes are important for processing and handling, as stronger skin can reduce damage during filleting. Biochemical analyses further highlighted differences in skin composition between the two varieties. Black tilapia skin had higher levels of collagen and hydroxyproline, which are crucial for maintaining skin elasticity and strength. On a genetic level, the red variety showed higher expression levels of specific collagen genes (alpha 1, 2, and 3 type I), suggesting a genetic basis for the observed differences in skin properties. Additionally, red tilapia had lower expression levels of the vimentin gene, which plays a role in maintaining cell structure, and higher antioxidant capacity, contributing to better muscle quality. These findings build upon previous research that has examined various aspects of tilapia breeding and genetics. For instance, a study on the growth performance of different Nile tilapia strains, including GIFT, demonstrated that the GIFT strain had superior growth rates in both fresh and brackish water environments compared to other strains like BIG NIN and Silver YY[2]. This established the GIFT strain as a promising candidate for further genetic improvement. Additionally, research into the genetic mechanisms of skin color in red tilapia identified specific microRNAs and genetic markers associated with pigmentation[3][4]. These studies laid the groundwork for understanding the genetic factors influencing tilapia traits, which the current study extends by linking skin color to both physical and biochemical characteristics. The Federal University of Sergipe’s study utilized a comprehensive approach, combining biometric measurements, biochemical assays, and genetic analyses to assess the differences between black and red GIFT Nile tilapia. By doing so, the researchers were able to provide a holistic view of how skin color phenotypes correlate with other important traits. This integrated methodology is essential for developing marker-assisted selection programs that can efficiently produce tilapia varieties tailored for specific commercial purposes, such as those requiring stronger skin for processing or enhanced muscle quality for better fillet yield. Moreover, the study’s findings have practical implications for the tilapia industry. Understanding that the red variety has higher muscle antioxidant capacity and better fillet quality can guide farmers and breeders in selecting the appropriate strain for markets that prioritize these attributes. Conversely, the black variety’s stronger skin makes it more suitable for operations where durability during processing is crucial. Additionally, the identification of genetic markers linked to skin color and related traits can accelerate breeding programs aimed at optimizing these characteristics. Incorporating these insights with previous genetic studies[3][4], the current research enhances the potential for genetic improvement in tilapia farming. By linking specific genetic expressions to tangible physical and biochemical traits, breeders can make more informed decisions, reducing the time and resources needed to develop superior tilapia strains. This not only benefits producers by improving efficiency and product quality but also meets consumer demands for high-quality fish with desirable traits. Overall, the study conducted by the Federal University of Sergipe provides valuable insights into the relationship between skin color and other important traits in GIFT Nile tilapia. By highlighting the distinct characteristics of black and red varieties, the research supports the development of targeted breeding strategies that enhance both the quality and commercial viability of tilapia. Integrating these findings with existing genetic knowledge paves the way for more effective and efficient tilapia farming practices, ultimately contributing to the sustainability and profitability of the aquaculture industry.

AgricultureGeneticsAnimal Science

References

Main Study

1) Characterization of fillets and skins from two varieties of genetically improved farmed Nile tilapia (Oreochromis niloticus)

Published 21st February, 2025

https://doi.org/10.1371/journal.pone.0314928

Related Studies

2) Growth performance of five different strains of Nile tilapia (Oreochromis niloticus) introduced to Tanzania reared in fresh and brackish waters.

https://doi.org/10.1038/s41598-021-90505-y

3) Comparative microRNA-seq Analysis Depicts Candidate miRNAs Involved in Skin Color Differentiation in Red Tilapia.

https://doi.org/10.3390/ijms19041209

4) QTL Mapping for Red Blotches in Malaysia Red Tilapia (Oreochromis spp.).

https://doi.org/10.1007/s10126-019-09888-9


Related Articles

An unhandled error has occurred. Reload 🗙