Individual Serum Triiodothyronine and Thyroxine Levels in Seven Freshwater Fish Species

Atanasoff, Alexander; Zapryanova, D.; Ürkü, Çiğdem; Nikolov, G.

doi:10.2478/trser-2021-0004

Cited by 2 publications

(1 citation statement)

References 15 publications

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“…In teleost fish, the thyroid gland is scattered elements (follicles) around the ventral aorta (Atanasoff et al, 2021). In them, thyrotropin-releasing factor (thyrotropin-releasing hormone TRH) stimulates the adenohypophysis (anterior pituitary) to secrete prolactin.…”

Section: Discussionmentioning

confidence: 99%

Effect of different light intensities on prolactin and cortisol plasma concentration in farming African catfish (Clarias gariepinus) in RAS with low-water exchange

Bozhkov

Nikolov

Ürkü

et al. 2023

Israeli Journal of Aquaculture - Bamidgeh

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In the Bulgarian aquaculture sector, focusing research efforts on the technical specifications of the cultivation of African catfish (Clarias gariepinus) is important due to the need for more information. We aimed to assess the impact of light intensities on prolactin and cortisol levels as stress markers in African catfish. Fish were acclimated over an appropriate period to the short photoperiod (16D and 8L) and then distributed randomly to three groups, each separated by sex. Fish exposed to different light intensities (63, 51, and 40 lux, respectively) were followed for 45 days by lux meter. Blood samples were collected from the caudal vein using a 2 ml K2EDTA-coated syringe. A laser fluorescence reader assayed plasma prolactin and cortisol. The pituitary was removed from anesthetized fish and fixed for histological examinations. The results of our study suggest that increasing light intensity increases prolactin and cortisol levels in African catfish.

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Section: Discussionmentioning

confidence: 99%

Effect of different light intensities on prolactin and cortisol plasma concentration in farming African catfish (Clarias gariepinus) in RAS with low-water exchange

Bozhkov

Nikolov

Ürkü

et al. 2023

Israeli Journal of Aquaculture - Bamidgeh

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The Effect of Dietary Addition of a Synbiotic After Long-Term Starvation on Certain Biochemical Parameters and Liver Structure in Common Carp (Cyprinus Carpio L.)

Zapryanova

Ürkü

Simeonov

et al. 2021

Archiva Zootechnica

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The prolonged starvation has many effects on the physiological and morphological processes in fish and interferes them with the ability to absorb nutrients and caloric intake. The aim of present study was to investigate the effect of long-term starvation and posterior dietary administration of commercial synbiotic consisting fructoligosaccharide (FOS) which used in combination with Enterococcus, Lactobacillus, Bifidobacterium and Lactococcus spp. for evaluation on some blood biochemical parameters and histological characteristics of common carp liver. Experimental fish after 5 months starvation period were subjected to the following feeding protocols: continuous starvation until 60 day (ST), re-feeding (FS) with dry composed diet (Aqua 1032 Swim) and refeeding with composed diet and synbiotic (FSS) for the following 60 days. Blood samples were used for analysis of the following plasma parameters: total protein, albumin, globulin, urea, creatinine, cholesterol, AST, ALT, glucose and serum for thyroid hormones. Histology analyses were performed on the carp liver samples. During the experimental period, fasting and refeeding were influenced significant on studied biochemical parameters, except glucose and urea. Also, the statistically largest (P <0.001) difference was observed in albumin and cholesterol values after refeeding. Our results reveal the changes in values of biochemical parameters during long-term starvation and refeeding with synbiotic and indicate signs of structural alterations of the liver in common carp.

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Individual Serum Triiodothyronine and Thyroxine Levels in Seven Freshwater Fish Species

Cited by 2 publications

References 15 publications

Effect of different light intensities on prolactin and cortisol plasma concentration in farming African catfish (Clarias gariepinus) in RAS with low-water exchange

Effect of different light intensities on prolactin and cortisol plasma concentration in farming African catfish (Clarias gariepinus) in RAS with low-water exchange

The Effect of Dietary Addition of a Synbiotic After Long-Term Starvation on Certain Biochemical Parameters and Liver Structure in Common Carp (Cyprinus Carpio L.)

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