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Environmental modulation of the onset of air breathing and survival of Betta splendens and Trichopodus trichopterus.

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Bibliographic Details
Title: Environmental modulation of the onset of air breathing and survival of Betta splendens and Trichopodus trichopterus.
Authors: Mendez‐Sanchez, J. F.1,2, Burggren, W. W.1
Source: Journal of Fish Biology. Mar2014, Vol. 84 Issue 3, p794-807. 14p.
Subjects: Air-breathing fishes, Siamese fighting fish, Gourami, Hypoxemia, Fish larvae, Partial pressure, Fertilization (Biology), Fishes
Abstract: The effect of hypoxia on air-breathing onset and survival was determined in larvae of the air-breathing fishes, the three spot gourami Trichopodus trichopterus and the Siamese fighting fish Betta splendens. Larvae were exposed continuously or intermittently (12 h nightly) to an oxygen partial pressure ( PO2) of 20, 17 and 14 kPa from 1 to 40 days post-fertilization ( dpf). Survival and onset of air breathing were measured daily. Continuous normoxic conditions produced a larval survival rate of 65-75% for B. splendens and 15-30% for T. trichopterus, but all larvae of both species died at 9 dpf in continuous hypoxia conditions. Larvae under intermittent (nocturnal) hypoxia showed a 15% elevated survival rate in both species. The same conditions altered the onset of air breathing, advancing onset by 4 days in B. splendens and delaying onset by 9 days in T. trichopterus. These interspecific differences were attributed to air-breathing characteristics: B. splendens was a non-obligatory air breather after 36 dpf, whereas T. trichopterus was an obligatory air breather after 32 dpf. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
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Abstract:The effect of hypoxia on air-breathing onset and survival was determined in larvae of the air-breathing fishes, the three spot gourami Trichopodus trichopterus and the Siamese fighting fish Betta splendens. Larvae were exposed continuously or intermittently (12 h nightly) to an oxygen partial pressure ( PO2) of 20, 17 and 14 kPa from 1 to 40 days post-fertilization ( dpf). Survival and onset of air breathing were measured daily. Continuous normoxic conditions produced a larval survival rate of 65-75% for B. splendens and 15-30% for T. trichopterus, but all larvae of both species died at 9 dpf in continuous hypoxia conditions. Larvae under intermittent (nocturnal) hypoxia showed a 15% elevated survival rate in both species. The same conditions altered the onset of air breathing, advancing onset by 4 days in B. splendens and delaying onset by 9 days in T. trichopterus. These interspecific differences were attributed to air-breathing characteristics: B. splendens was a non-obligatory air breather after 36 dpf, whereas T. trichopterus was an obligatory air breather after 32 dpf. [ABSTRACT FROM AUTHOR]
ISSN:00221112
DOI:10.1111/jfb.12322