NILE TILAPIA (Oreochromis niloticus Linnaeus 1758) IN MESOHALINE WATER OVERPRODUCES SKIN DERMATAN SULFATE
DOI:
https://doi.org/10.18817/repesca.v16i4.4256Resumo
Tilapia culture in saline waters has been a reality, but the effects on the skin-glycosaminoglycan-(GAG) composition are little known. This study evaluated the (fresh/dehydrated) skin of freshwater/10‰-mesohaline marked tilapia on its morphometry/biomass, water content (WC) and GAGs yield. Skin (n=10/5 group-1) was determined on the percentage (w w-1) from the total fish or fresh tissue, with WC by difference in dehydrated mass. GAGs from fresh/dehydrated skin digestion with papain were analyzed for metachromasy using cationic dye and structurally by infrared spectroscopy. Results showed no difference between morphometry vs. fresh skin yield (2.60±0.12/2.68±0.11%, p>0.05) from total fish, but there were (p<0.05) in total residual (8.13±0.64/8.26±0.76g vs. 3.33±0.25/4.97±0.35g), relative mass (41.00±0.35 vs. 60.56±1.46%), WC (58.95±0.34% vs. 39.40±1.45%) and level of GAGs (0.06±0.00% vs. 0.15±0.00/0.19±0.01%) from tilapia (fresh vs. dehydrated) skin between both origins. Samples had dermatan, except for dermatan/chondroitin chain in freshwater tilapia skin. The study suggested that the skin GAGs composition changes as a compensatory response to the saline effect, but does not affect tilapia performance.
Downloads
Publicado
Como Citar
Edição
Seção
Licença
Copyright (c) 2025 Revista Brasileira de Engenharia de Pesca

Este trabalho está licenciado sob uma licença Creative Commons Attribution 4.0 International License.






