Components of the Hematological Response of Fishes to Environmental Temperature Change: A Review

Houston, A. H.

doi:10.1007/978-1-4899-3659-2_9

Cited by 31 publications

(30 citation statements)

References 131 publications

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“…This group includes species such as the plaice, flounder and carp. Given the similarities of the isomorph systems of carp, carp x goldfish hybrids and goldfish (Houston 1980) it is reasonable to assume that the hemoglobins of the goldfish probably fall into this category as well. Class II systems, as exemplified by trout and eel, are functionally heterogeneous.…”

Section: Fig Lbmentioning

confidence: 99%

Variable versus constant temperature acclimation regimes: Effects on hemoglobin isomorph profile in goldfish,Carassius auratus

Houston

Gingras-Bedard

1994

Fish Physiol Biochem

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Goldfish,Carassius auratus, were acclimated for 2 to 3.5 weeks to three temperature regimes: [1] temporally-constant (10, 20 and 30°C), [2] diurnally-cycling (20 ± 10°C) and [3] randomly-fluctuating (± 2°C at approximately 2h intervals between extremes of 10 and 30°C). No significant differences in hematocrit were evident. Hemoglobin levels in fish at constant 30°C and under randomly fluctuating temperature were significantly elevated. Of the three hemoglobin isomorphs observed, the two minor components (G1, G3) tended to decrease in relative abundance with increase in constant temperature, but increased under varying temperature regimes. The converse was true of the principal hemoglobin, G2. Extent of isomorph variation was correlated with extent of temperature variability. These observations confirm that temperature variability significantly effects thermoacclimatory response. The functional significance of changes in isomorph abundances during the acclimatory process is considered.

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Section: Fig Lbmentioning

confidence: 99%

Variable versus constant temperature acclimation regimes: Effects on hemoglobin isomorph profile in goldfish,Carassius auratus

Houston

Gingras-Bedard

1994

Fish Physiol Biochem

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“…Although changes in hemoglobin isomorph profiles are a common theme of hematological response to respiratory and other stresses (Houston 1980), their basis is as yet uncertain. It is unlikely, however, that they stem from hemoglobin synthesis in mature cells.…”

Section: Introductionmentioning

confidence: 99%

Hematological response in fish: pronephric and splenic involvements in the goldfish,Carassius auratus L.

Houston

Roberts

Kennington

1996

Fish Physiol Biochem

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Pronephric and splenic involvements in erythropoiesis and in stress-induced hematological response by goldfish,Carassius auratus, were examined under conditions of minimal stress and following transient (3h) temperature-induced elevation of O2 demand and transient (3h) exposure to hypoxia. Although hemoglobin content and red cell numbers were little affected, the ontogenic composition of the circulating erythrocyte population was significantly altered by both types of respiratory challenge and also by the stresses associated with capture, air exposure during transfer and intraperitoneal administration of label. Juvenile cell numbers increased sharply while mature erythrocyte abundances declined. Consistent with this, [(3)H] methylthymidine-labeled cell numbers rose in both spleen and pronephros following imposition of stress. Splenic erythropoietic activity was modest relative to that of the pronephros. Our observations point to a readily triggered response involving: [1] release of cells reservoired in the spleen and pronephros, [2] increased erythropoiesis and [3] karyorrhexis. We suggest that while the magnitude of response may depend on the quality and magnitude of the imposed stress, its central features are essentially constant.

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“…An alternative strategy to modulate oxygen affinity under hypoxia is a change in iso-Hb composition, involving preferential synthesis of high-affinity hemoglobins, or a reduction in the amount of low-affinity hemoglobins. Despite extensive studies, only small alterations in the hemoglobin composition of fish have been observed following short-and long-term hypoxia acclimation (11)(12)(13)20).…”

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confidence: 99%

Multiple strategies of Lake Victoria cichlids to cope with lifelong hypoxia include hemoglobin switching

Rutjes

Nieveen²,

Weber³

et al. 2007

American Journal of Physiology-Regulatory, Integrative and Comp

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Many fish species adapt to hypoxia by reducing their metabolic rate and increasing hemoglobin-oxygen (Hb-O2) affinity. Pilot studies with young broods of cichlids showed that the young could survive severe hypoxia in contrast with the adults. It was therefore hypothesized that early exposure results in improved oxygen transport. This hypothesis was tested using split brood experiments. Broods of Astatoreochromis alluaudi, Haplochromis ishmaeli, and a tilapia hybrid ( Oreochromis) were raised either under normoxia (NR; 80–90% air saturation) or hypoxia (HR; 10% air saturation). The activity of the mitochondrial citrate synthase was not different between NR and HR tilapia, but was significantly decreased in HR A. alluaudi and H. ishmaeli, indicating lowered maximum aerobic capacities. On the other hand, hemoglobin and hematocrit levels were significantly higher in all HR fish of the three species, reflecting a physiological adaptation to safeguard oxygen transport capacity. In HR tilapia, intraerythrocytic GTP levels were decreased, suggesting an adaptive increase of blood-O2 affinity. Similar changes were not found in HR H. ishmaeli. In this species, however, all HR specimens exhibited a distinctly different iso-Hb pattern compared with their NR siblings, which correlated with a higher intrinsic Hb-O2 affinity in the former. All HR cichlids thus reveal left-shifted Hb-O2 equilibrium curves, mediated by either decreased allosteric interaction or, in H. ishmaeli, by the production of new hemoglobins. It is concluded that the adaptation to lifelong hypoxia is mainly due to improved oxygen transport.

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Components of the Hematological Response of Fishes to Environmental Temperature Change: A Review

Cited by 31 publications

References 131 publications

Variable versus constant temperature acclimation regimes: Effects on hemoglobin isomorph profile in goldfish,Carassius auratus

Variable versus constant temperature acclimation regimes: Effects on hemoglobin isomorph profile in goldfish,Carassius auratus

Hematological response in fish: pronephric and splenic involvements in the goldfish,Carassius auratus L.

Multiple strategies of Lake Victoria cichlids to cope with lifelong hypoxia include hemoglobin switching

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