- 1.
Crucian carp (Carassius carassius L.) and Common carp (Cyprinus carpio L.) were subjected to 2h progressive hypoxia followed by up to 6 h anoxia in closed respirometers at 15°C.
- 2.
The concentrations of glycogen, glucose, phosphoryl creatine, alanine, succinate, lactate, ethanol and ammonia were determined in whole Crucian carp following exposure to both hypoxia and anoxia.
- 3.
Ethanol and lactate were the main anaerobic end products. Glycogen utilization during anoxia amounted to 2mmol glucose equivalents.kg wet weight−1 h−1. Around 85% of the ethanol produced (2.8mmolkg−1h−1) was excreted. Lactate accumulation (0.7 mmol kg−1 h−1) was only sufficient to account for 18.5% of the glycogen stores utilized. Ammonia production(0.2 mmol.kg body wt−1 h−1) was independent of the environmental oxygen availability.
- 4.
Ethanol concentrations (μmol.g wetwt−1) were 7 in red myotomal muscle, 4 in white myotomal muscle, and 2 in liver after 6h anoxia.
- 5.
In contrast to Crucian carp, Common carp (Cyprinus carpio L.) did not produce ethanol at 15°C even after near lethal exposure to anoxia (5–6 h).
In the field: an interview with Sönke Johnsen
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Sönke Johnsen is a Professor at Duke University, USA, investigating visual ecology and he talks about his experiences of collecting transparent animals while blue water diving and in a submersible, as well as outrunning Hurricane Katrina.
Call for new preLighters
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preLights is the preprint highlighting community supported by The Company of Biologists. At the heart of preLights are our preLighters: early-career researchers who select and write about interesting new preprints for the research community. We are currently looking for new preLighters to join our team. Find out more and apply here.
Graham Scott in conversation with Big Biology
Graham Scott talks to Big Biology about the oxygen cascade in mice living on mountaintops, extreme environments for such small organisms. In this JEB-sponsored episode, they discuss the concept of symmorphosis and the evolution of the oxygen cascade.
Trap-jaw ants coordinate tendon and exoskeleton for perfect mandible arc
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Trap-jaw ants run the risk of tearing themselves apart when they fire off their mandibles, but Greg Sutton & co have discovered that the ants simultaneously push and pull the mandibles using energy stored in a head tendon and their exoskeleton to drive the jaws in a perfect arc.
Hearing without a tympanic ear
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In their Review, Grace Capshaw, Jakob Christensen-Dalsgaard and Catherine Carr explore the mechanisms of hearing in extant atympanate vertebrates and the implications for the early evolution of tympanate hearing.
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