Seasonal changes in haematology and metabolic resources in the tench

Abstract

Significant variations in the number of white and red blood cells, haematocrit and haemoglobin were found throughout the year in sexually mature male and female tench Tinca tinca. In general, the lowest values were observed during autumn-winter and the highest during summer, with males exhibiting higher values than females. Plasma glucose, cholesterol and triglycerides were lower during the winter than during the summer-autumn seasons in both sexes. Gonadosomatic and hepato-somatic indices were inversely correlated in female tench throughout the year. Seasonal patterns in liver metabolic resources were very similar for both sexes. For males and females, liver glycogen and proteins increased during the autumn, whereas the liver stored lipid during spring. Dorsal muscle mainly deposited glycogen, whereas lipid was mainly stored in the ventral muscle. Relations between seasonal changes in environmental factors, such as feeding and temperature are discussed.

A comparative study on some blood factors in male and female Caspian kutum (Rutilus frisii kutum) broodstock from southern basin of the Caspian Sea

“…In addition, lipid and protein levels are recognized as the main energy sources to assist fish migration upriver during spawning season (29,30); therefore, glucose is not normally utilized during the migration period (spring). This result is in accordance with previous plasma glucose findings in tench, Tinca tinca (31). Some studies, on the other hand, reported slight changes in glucose levels when comparing male and female broodstock of A. persicus (22), B. sharpei, and farmed C. idella (21).…”

Comparative study on hematological parameters of farmed matrinxã, Brycon amazonicus Spix and Agassiz, 1829 (Characidae: Bryconinae) with others Bryconinae species

“…Thus, for B. amazonicus juvenile, red blood cell counts, hematocrit and hemoglobin values were lower than for fry B. amazonicus and for other Bryconinae species, yet, MCV was higher than for these fish (Table 3). Additionally, these two B. amazonicus populations came from different habitats, probably explaining the difference in these parameters (Guijarro et al, 2003;Tavares-Dias and Moraes, 2004).…”

“…Interspecies variations in red blood cells parameters have been attribute to many internal and external factors (Tavares- Dias and Moraes, 2004;Tavares-Dias and Moraes, 2006a) such as the quality of the aquatic environment, season, sex, age, nutritional status, stress due to capture, handling and sampling procedures and water temperature (Ranzani-Paiva, 1991; Guijarro et al, 2003;Tavares-Dias and Moraes, 2004;Kori-Siakpere et al, 2005). Thus, for B. amazonicus juvenile, red blood cell counts, hematocrit and hemoglobin values were lower than for fry B. amazonicus and for other Bryconinae species, yet, MCV was higher than for these fish (Table 3).…”

“…Hematological parameters of various farmed fish species have been investigated aiming to establish baseline values (Ranzani-Paiva, 1991;Guijarro et al, 2003;Tavares-Dias and Moraes, 2004;Kori-Siakpere et al, 2005;Tavares-Dias and Moraes, 2007), in addition to identify disturbances caused by parasitic infections (Tavares- Dias and Moares, 2004). Interspecies variations in red blood cells parameters have been attribute to many internal and external factors (Tavares- Dias and Moraes, 2004;Tavares-Dias and Moraes, 2006a) such as the quality of the aquatic environment, season, sex, age, nutritional status, stress due to capture, handling and sampling procedures and water temperature (Ranzani-Paiva, 1991; Guijarro et al, 2003;Tavares-Dias and Moraes, 2004;Kori-Siakpere et al, 2005).…”

Regularities of Variation of the Red Blood Indices Characterizing the Respiratory Function of Blood in Selected Fish

“…A good example here might be seasonality of climate as manifested in temperature change and oxygenation of water, among other things, these undoubtedly influence values for haematological parameters in fish (WIESER 1991, LUSKOVÁ 1997, 1998. Likewise, in spite of the now well-documented influence of the external environment on blood morphology, the directions to seasonal changes in values for the haematological parameters in the animal group in question have remained unclear (GUIJARRO et al 2003).…”