University:
York University
Course:
BIOL 4340 | Fish Biology
Academic year:

2019
Views:

439

Pages:

3
Author:

Nick T.

Module 6 Health and Diseases Terms: to Zoonotic Diseases that can be transferred from Animals Humans. Prophylaxis the preventing of diseases. Not apparent in extensive systems, but intensive, yes. Virulence Agent's ability to cause harm to organism. Obligate vs. Opportunistic Pathogens. Physical barriers Skin, scales, exoskeleton Mucus membranes Immune System. Young animals are less susceptible. Outcomes: Lethality, Eliminated, Carrier As soon as you spot it, react and quarantine! Vaccines can be used and applied. Intraperitoenally inject through gut cavity. Look for changes in behavior or any kind of anatomical abnorm. Taura Syndrome: TSV Lethargy, red tail, necrosis (Spots) White spot Syndrome - wssv. EMS/TPMS/TNHP Module 7(9): Genetics Breeding for resistant. Broadcast spawners means that breeding might be difficult. Two major types of control → Manipulation of the reproductive cycle. Induction of gonadal gamete releases. Ideally, your fish will be bred for resistanc to diseases. Fast growth rate. More nutrit- lous. De creased Fat content. Other aims of Selection: Speeding up sexual maturation. Changes to increase. consumer acceptance. Inbreeding = bad. + Ploidy: Tri Tetra, Aneuploidy. Transgenic DNA. + genetics brought for reproducing. Sperm mediated, Retroviral inf., Gene gun. * SHOCK can cause triploidy. Module Prawns: Indo pacific (West) Native to Texas are Macanthurus and M. carcinus head (cephalothorax) tail (abdomen) rostrum eye pleura telson 7 chela 2 34 5 10 cm (3.9 in.) uropods pleopods antenna (swimmerets) 2nd abdominal somite (segment) periopods (paired walking legs- numbered 1-5) gill region of carapace Figure 1. External anatomy of the freshwater prawn Very slow Slow Fast Males: Small male, Orange claw, blue claw males.. Females transfer eggs from underside to the "brood enamber" LOW DALINITY WATERS ESTUARINE WATERS Fertilize to Hatch = 3 weeks. Raised on Artemia bet Module: Oysters Species cultured in U.S. ➤Crassostrea virginica (Eastern oyster) ✓ Found on East Coast and the Gulf of Mexico. Not everything is bigger in Texas... Crassostrea gigas (Pacific oyster) ✓ Found on pacific coast. Some have a 'fluted'/ruffled shell ✓ Grows larger than C. virginica. ✓ Tastes different than C. virginica (so they say!) Giga Giant See monograph by Galstoff Consume microalgae and zooplankton. Trocophore larvae SHELL LENGTH A Flow