Growth (non-mammalian) Flashcards
Describe determinate growth of fish (zebrafish)
Growth pattern set in early development.
Describe indeterminate development (giant danio)
Growth continues throughout the lifespan of the fish.
Name some advantages to indeterminate growth.
Larger size = greater efficiency
More food options
Reduces number of potential predators
What external factors affect fish growth?
temperature
chemicals
food availability
habitat
How does long day length affect fish growth?
Growth increases.
How does ammonia affect fish growth rate?
High concs slow growth rate.
How can scales be used to indicate growth in different seasons?
Longitudinal bands on scales.
What is the target tissue of growth hormone in fish?
Liver
What is the pharyngeal phase of growth in embryogenesis in reptiles?
When basic organ system is established.
How is bone formed in reptiles?
First formed as cartilage.
Why do giant reptiles grow throughout life?
ends of bone remain as cartilage, do not calcify.
What type of insects don’t undergo metamorphosis?
wingless haxapods, silverfish.
Only increase in size, keep moulting even after they have reached sexual maturity.
Give an example of partial metamorphosis in insects.
Water-striders. Nymohs lack wings and genitalia and occupy the same habitat as the adult.
Give an example of complete metamorphosis in insects.
Drosophila
egg, larva, pupae and adult.
Name the 2 hormones that control metamorphosis in insects.
Prothoracicotrophic hormone
Juvenile hormone
