swimbladders
Fish flotation sacs
Swimbladders are gas-filled organs in bony fish that control buoyancy, allowing the fish to maintain depth without expending energy swimming.
By adjusting the gas volume, a fish rises or sinks.
Also called air bladders.
The singular swimbladder appears in biological contexts: The swimbladder had ruptured, leaving the fish unable to stay upright.
Abnormal fluid accumulation
- bloatSwell abnormally
- constipationDifficult, infrequent waste elimination
- bacterial infectionIllness from harmful microorganisms
- floatingStaying atop liquid
sinking · listing · overfeeding · treatment · aquarium · goldfish · betta · koi
Balanced submersion state
- hydrostaticOf fluid pressure at rest
- displacementRemoval from usual location
- upthrustForceful upward push
- floatationCapacity to stay buoyant
ballast · density · specific gravity · inflation · deflation · gas exchange · pressure · submersion
Having shared evolutionary origin
- lungRespiratory chest organ
- primitiveIn earliest form
- derivedObtained from a source
- adaptationFitting to new conditions
respiration · gas exchange · tetrapod · vertebrate · phylogeny · ancestral · lungfish · coelacanth
Bony, ray-finned fish
- gillsAquatic respiratory organs
- scalesPlates or weighing devices
- finsSwimming appendages
- aquaticWater-inhabiting
marine · freshwater · schooling · spawn · pelagic · benthic · reef · carp
Bony, ray-finned fish
- peritoneumMembrane lining the abdomen
- visceraAbdominal organs collectively
- coelomMesoderm-lined internal space
- mesenteryTissue suspending intestines internally
epithelium · vascular · homology · endoderm · ichthyology · anatomical · oval window
dropsy
Abnormal fluid accumulation
- bloatSwell abnormally
- constipationDifficult, infrequent waste elimination
- bacterial infectionIllness from harmful microorganisms
floating · sinking · listing · overfeeding · treatment · aquarium · goldfish · betta · koi
neutral buoyancy
Balanced submersion state
- hydrostaticOf fluid pressure at rest
- displacementRemoval from usual location
- upthrustForceful upward push
floatation · ballast · density · specific gravity · inflation · deflation · gas exchange · pressure · submersion · buoyant
homologous
Having shared evolutionary origin
adaptation · respiration · gas exchange · tetrapod · vertebrate · phylogeny · ancestral · lungfish · coelacanth
teleost
Bony, ray-finned fish
aquatic · marine · freshwater · schooling · spawn · pelagic · benthic · reef · carp · cod
teleost
Bony, ray-finned fish
- peritoneumMembrane lining the abdomen
- visceraAbdominal organs collectively
- coelomMesoderm-lined internal space
mesentery · epithelium · vascular · homology · endoderm · ichthyology · anatomical · oval window