Modulation of Biochemical and Haematological Indices of Silver Carp (Hypophthalmichthys molitrix Val.) Exposed to Toxic Cyanobacterial Water Bloom

Abstract

The aim of this study was to evaluate the influence of toxic cyanobacterial water bloom on the blood indices of two-year-old silver carp (Hypophthalmichthys molitrix Val.). Experimental fish (336 ± 32 mm length, 365 ± 112 g weight) were exposed to a natural population of cyanobacterial water bloom (mainly Microcystis aeruginosa and M. ichthyoblabe) that contained microcystins (total concentration 133-284 µg·g -1 (DW), concentration in water 2.8-7.4 µg·l -1 ). Haematological indices showed marked changes in fish exposed to the cyanobacterial population compared to the control group. Statistical evaluation of the influence of cyanobacterial water bloom on biochemical and haematological indices of silver carp showed a distinct decrease of albumin, alkaline phosphatase, cholesterol, glucose, total protein, creatinine, lactate, lactate dehydrogenase, phosphorus, iron, cholinesterase, haemoglobin, haematocrit, erythrocyte and leukocyte compared to the control. Values of alanine aminotransferase were significantly increased compared to the control. After exposure to the cyanobacterial water bloom, the silver carp were kept in pure water for monitoring the persistence of biochemical and haematological indices. Influence of the cyanobacterial population on values of albumin, alkaline phosphatase, cholesterol, total protein, glucose, creatinine, phosphorus, iron, cholinesterase, erythrocyte and haematocrit persisted up to 28 days after the end of exposure. Duration of exposure, toxicity and density of cyanobacterial water bloom had an important impact on individual biochemical and haematological indices.

Effect of freshwater toxic and non toxic cyanobacteria, (Microcystis aeruginosa) strains on some biochemical parameters of Oreochromis niloticus

“…Glucose analyses showed elevated glucose levels in treated group than in control (Table 3). These results agreed with that of Zikova et al (2010) who found a mild to moderate increase in glucose levels indicating mild to moderate stress, while it disagreed with Carbis et al (1996) who found no changes in glucose levels in the common carp Cyprinus carpio exposed to toxic Microcystis and Kopp et al (2010) who stated that the glucose levels were decreased in carp exposed to toxic Microcystis.…”

“…As shown in Table (4), total protein levels were decreased in the treated group (Hypoproteinemia) compared to control group, as was found by Kopp et al (2010) who treated carp with Microcystis. The decreased levels of total protein in the present study could be due to the increase of cortisol in the blood of stressed fish (Figs.…”

“…Similar findings were obtained by Carbis et al (1996). However this result disagrees with Kopp et al (2010) who noticed decreased albumin levels in silver carp hypophthalmichthys molitrix exposed to toxic Microcystis bloom.…”

The effect of thermal shock on morphological characteristics of blood cells in Siberian sturgeon (Acipenser baerii) triploids

“…Compare 68.4% in a 70-day-old sturgeon tested in this study with 68-73.5% (Palikova et al 1999) and 66.1 ± 12.4% (Gomulka et al 2008). A smaller count of blood cells, including white cells, is a characteristic of triploid fish (Benfey 1999), in which depressed counts of white cells responsible for defence mechanisms in fish is a reflection of immunosuppression associated e.g., with stress caused by exposure to toxic factors (Kopp et al 2010). A significant decrease in the count of lymphocytes under stress in salmonid fish (Benfey and Biron 2000) supports the statement that cells of the defence system in this type of fish are particularly vulnerable.…”

The influence of physicochemical properties of water on plasma indices in brook trout (Salvelinus fontinalis, Mitchill) reared under conditions of intensive aquaculture

“…Liver enzymes (ALT, AST and LDH) are the most frequently tested enzymes in fish used for the indication of toxicity, environmental pollution and nonspecific indicators of damage (Bucher 1990;Kopp et al 2010). Our results have indicated none or minimal influence of physicochemical properties of water on values of activity of liver enzymes.…”