The study on length and weight indices of Great sturgeon (Huso huso) cultured in brackish water

Document Type : Scientific - Research Articles

Authors

• ali akbari Hedayati ¹
• tahereh Bagheri ²

¹ Ferdowsi University of Mashhad

² Ferdwosi University of Mashhad

10.22067/ijasr.v2i1.3111

Abstract

This study was done on 4 and 5 years old Great sturgeon cultured in brackish water ponds in Bafgh salt water fisheries
research station during one year. We examined somatic growth indices and effects of different diets on blood parameters and
total length and weight. Diet with constant protein (%40) and different energy levels (400,425,450,475 cal/100g) were fed to
74 pieces of Great sturgeons in 8 circle cement ponds. Biometry, as well as blood analysis were done every season. The assay
were done for glucose was measured with Auto analyzer, calcium and magnesium with spectrophotometer and sodium and
potassium with film photometer, Hormone levels (cortisol, testosterone, progesterone and esteradiol) were measured by
Radio Immunoassay (RIA) in Yazd central laboratory. Total length and weight were not affected by sex, but they were
affected significantly with season (p>0.05). The length and weight indices were also affected significantly by diet. Along
with increasing energy content, these indices were improved. Among analyzed blood parameters, just magnesium had
significant reverse correlation with total length and weight. Also, testosterone had direct correlation with total weight and
progesterone had reverse correlation with total length significantly. Growth indices had overlapped in both sexes (a little
more in male). On the other hand, Growth rate was similar in both sexes, but somatic growth indices were slightly improved
along with increasing age in males.

Keywords

• Somatic growth
• Great sturgeon
• Testosterone and Progesterone hormones
• Energy levels
• Brackish water pond 1

---