Pleurobrachia (Gr. pleuron, side, + L. brachia, arms) is about 1.5 to 2 cm in …
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1 week ago
Teeth of Fishes
Living Agnathan fishes possess conical, rasping tooth-like structures made of keratin, the same stru…
2 weeks ago
Osmoregulation in Chondrichthyes
Blood ionic composition in marine elasmobranchs and holocephalans is some what higher than in teleos…
2 weeks ago
Food Choices of Fish
But optimal foraging strategies may not remain identical throughout an organism’s lifespan and many …
3 weeks ago
The Osmotic Problem of Fishes
Different fishes live in waters from almost distilled purity, to hypersaline ponds where they hav…
3 weeks ago
Circulation in Fishes: Primary and Secondary
The oxygen acquired (from water or air), and the carbon dioxide excreted at the gills, have to be tr…
4 weeks ago
Respiration in Hagfish and Lampreys
Hagfish In hagfishes, unidirectional water flow through the serial muscular gill pouches is chiefly …
4 weeks ago
Origin of Freshwater Fishes
The variety of freshwater fishes is striking, for they show radiations into different habitats with …
4 weeks ago
Freshwater Fishes: Diversity
Diversity of Freshwater Fishes Despite representing only a miniscule (0.0093% according to Horn, 197…
4 weeks ago
Marine Fishes: The Open Ocean
Epipelagic Fishes The open ocean beyond the continental shelf covers nearly two-thirds of the surfac…
March 31, 2024
Marine Fishes: Coastal Region and Shallow Seas
Warm-water Fishes By far the greatest number (80%) of the 10 000 or so species of fishes in shallow …
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Pre-Cambrian Life: Appearance of Eukaryotes
Eukaryotes (“true nucleus”) have cells with membrane-bound nuclei containing chromosomes composed of chromatin. Constituents of …
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The Oparin-Haldane Hypothesis: Proof of Prebiotic Synthesis
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Water: An Essential Component to Make Life Happen
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Global Time and Different Time Scales
Global Time There’s an old Canadian joke that goes, “Repent! The world will end at …
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The Geographic Grid of Earth System
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Shape of the Earth & Its Rotation
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The Digestive Tracts of Fishes
The digestive tract of fishes is divided into four regions: the foregut (esophagus and stomach, …
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Teeth of Fishes
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Osmoregulation in Chondrichthyes
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Food Choices of Fish
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The Kidney of Fishes