How do all lampreys obtain food for most of their life?
Fresh waters account for less than 1% of the total water on earth, yet nearly 40% of all living fish are found in fresh water. One reason for this is the diversity of the types of fresh water. Rivers and streams provide very different types of habitats at different elevations. They differ in flow rate, botom type, temperature, pH, dissolved oxygen content, and other chemical factors. Even lakes are quite different, ranging from deep, cold lakes to shallow, sun-warmed lakes. Class Agnatha Class characteristics: Slinder, eel-shaped body. 7 external gill openings. The notochord persists in the adult. The skeleton is composed of cartilage. There are no paired fins. The adult digestive system has no stomach. Texas has two representatives in the Family Petromyzontidae: • Southern Brook Lamprey – Ichthyomyzon gagei – a nonparasitic lamprey. • Chestnut Lamprey – Ichthyomyzon castaneus – a parasitic lamprey. Lamprey life cycle: • Lampreys will lay their eggs in flowing water. • When the eggs ha
