Effects of salinity on gill histology in sailfin velifera (<i>Poecilia velifera</i>)

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Oguz A., Sepil A., Alkan Z., Azizoglu B., Şen F., Oguz E.

AQUACULTURE INTERNATIONAL, pp.1-13, 2023 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Publication Date: 2023
  • Doi Number: 10.1007/s10499-023-01286-2
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, Aquatic Science & Fisheries Abstracts (ASFA), BIOSIS, CAB Abstracts, Food Science & Technology Abstracts, Geobase, INSPEC, Pollution Abstracts, Veterinary Science Database
  • Page Numbers: pp.1-13
  • Keywords: Velifera, Mitochondria-rich cell, Histology, Gill, Heat shock protein, PCNA, Salinity
  • Van Yüzüncü Yıl University Affiliated: Yes


Fish live in aquatic areas with varying salinity from fresh water to seawater. Gills are one 

of the most important osmoregulatory organs for maintaining the salt–water balance. In 

this study, changes in the gills of velifera (Poecilia sphenops) acclimated to 20, 30, 40, 

and 50 ppt of saline in the laboratory were examined histologically and immunohisto-

chemically. Mucus cells (MCs), proliferating cell nuclear antigen (PCNA), mitochondria-

rich cells (MRCs), and heat shock proteins (HSP70) + cells were marked in the gill tissue, 

which underwent routine histological procedures, and the severity of histological altera-

tions increase with the increase of the salinity. When the gills were examined histologi-

cally, it was determined that there was an increase in cells due to hyperplasia, especially in 

the primary lamellae. A rapid increase in MC and HSP70 + cell numbers was observed in 

the 20 and 30 ppt groups. Although PCNA + cells were present in each salinity group, they 

were observed in the salinity group up to 50 ppt. An increase in the number and volume of 

MRCs was observed with increasing salinity. Based on the histological and immunohisto-

chemical results, it is thought that the cytological and molecular arrangements of cells in 

gills of sailfin velifera under different levels of salinity are essential for the regulation of 

ion and salt balance.