Haematological effects of prolonged sublethal hypoxia on channel catfish*Ictalurus punctatus (Rafinesque)

Abstract

Sub-adult channel catfish, Ictaluruspunctatus, were exposed to sublethal hypoxia for 24,48 or 72 h. Haematological parameters were used to assess the physiological state of the catfish subjected to prolonged, sublethal hypoxia. Haemoglobin, mean corpuscular haemoglobin, mean corpuscular haemoglobin concentration, plasma lactic acid and plasma glucose deviated significantly from control values in channel catfish exposed to hypoxia for 24,48 or 72 h. Haematocrit, total plasma protein, total erythrocyte counts, total leukocyte counts mean corpuscular volume and differential leukocyte counts were not sensitive indicators I the catfish's physiological status. After five days of reacclimation to oxygen levels n' saturation, channel catfish continued to exhibit haematological responses to prolo? hypo x i a.

Improving aeration for efficient oxygenation in sea bass sea cages. Blood, brain and gill histology

“…The total leucocyte number as well as lymphocyte number and percentage were reduced 24 h after the stressor was introduced. The percentage of lymphocytes, thrombocytes, neutrophils and haemoblasts of channel catfish were not significantly altered by prolonged sublethal hypoxia [46]. Our percent differentiation of the sea bass leucocytes in the aerated and control cages showed no significant difference, indicating the absence of hypoxic stress.…”

Protective effect of herbal and probiotics enriched diet on haematological and immunity status of Oplegnathus fasciatus (Temminck & Schlegel) against Edwardsiella tarda

“…Scott and Rogers [42] also reported a significant increase in Hb level in stressed I. punctatus leading to an elevated oxygen carrying capacity of the individual erythrocytes. The decreasing trend in RBC, Ht, and Hb levels in infected fish indicate that RBCs are being destroyed by the leucocytosis activity in erythrocytic anemia with subsequent erythroblastosis [43].…”

“…The decrease in the Hb content in the postchallenged fish observed in this study is in agreement with Foda [41] in furunculosis infected Atlantic salmon by A. salmonicida. The fall in Hb level may be due to swelling of the RBCs as well as poor mobilization of Hb from the spleen and other hemopoeitic organs as reported in Ictalurus punctatus [42].…”

Haematological changes in South Indian fresh water murrel, Channa punctatus have both EUS and A. hydrophila infection

“…These values are insignificant. The study of the RBCs in combination with poor HB mobilization from the Spleen to other hemopoeitic organs resulted in decreased HB and RBC levels due to hypochromic microcytic anemia of the fish infected with A. hydrophila (Scott and Rogers 1981). The results showing that the level of HB, values of PCV, MCH, MCHC and the number of RBCs were significantly decreased in Channa striatus, fish injected with A. hydrophila when compared to that of control fish Haniffa et al (2011) Similarly, decreased levels of RBCs, and PCV were noticed in Red Salmon, Rain bow Trout, Carp, Nile Tilpia infected by 1 Skin 8.2 ± 0.12 9 10 7 2 Gill 6.4 ± 0.4 9 10 5 3 Liver 4.5 ± 0.5 9 10 3 4 Pancreas 3.2 ± 0.8 9 10 3 Table 3 The Vibrio anguillarm Harbell et al (1979), A. Sobria and A. Cavia Ř ehulka (2002), A. hydrophila Harikrishnan et al (2003), Streptococcus iniae Chen et al (2004) respectively.…”