Week: 1

1
Week 1Fish Physiology Adopted from Dr.
Eric B. May, Fish PhysiologySome General
ProcessesFeeding and DigestionGrowth and
Metabolism

• Dr. Ir. Happy Nursyam, MS
• Fisheries and Marine Science Faculty
• Brawijaya Universiya, Indonesia
• 2009

2
Introduction
3
Active Transport Mechanisms

• A Cosymport or symport movement of ions or
  molecules via ionic gate or macromolecule
• B Antiport movement of ions or molecules via
  ionic gate or macromolecule

A
B
4
Trans-Membrane Transport of Macromolecules

• 1 Attachement of molecule to receptor or surface
• 2 Involution of surface
• 3 Engulfment of molecule
• 4 Pinching off and import of macromolecule into
  the cell

5
Feeding and Digestion
My Best Subject
Feeding
6
Energy Budgets

• Intake ( I Income)
• Macronutrients
• Carbohydrates
• Fats/Oils
• Proteins
• Micronutrients
• Vitamins
• Essential
• Fatty Acids
• Amino Acids
• Sugars

• Energy Use (E Expenditure)
• Respiration
• Osmoregulation
• Movement
• Feeding
• Digestion
• Reproduction

IF I E Growth 0 I lt E Growth
I gt E Growth
7
Grouping by Diet (Continued)

• Usually a function of co-adaptation of mouth and
  digestive tract, ie
• Menhaden Gizzard, elongated large intestine
• Striped Bass Muscular stomach, short intestines
• Butterfly Fish Coiled small and large
  intestines

• Herbivores
• Detritivores
• Carnivores

8
Absorption Lipids

• Lipids
• Bile Emulsification
• Absorption
• Conversion to Lipoproteins (Complex Aggregates of
  Macromolecules)
• Volatile Fatty Acids Directly Absorbed (Small
  Sized Molecules with polar/nonpolar groups

9
Absorption (Continued)Absorption and
Mobilization of Fatty Acids
10
Absorption (Continued)Carbohydrates

• Active Co-transport (Anti-port) of Simple Sugars
• Sodium Ion Moves out Passively in Response to
  Solute Gradient
• If Protein Gates Saturated no Futher Absorption
• Cellulose, Though Complex Carbohydrate is
  Fermented into Volatile Fatty Acids

Lumen
Cell
Monosaccharides
Sodium Ion
Protein is specific to Monosaccharide Type
11
Absorption (Continued)Proteins

• Mono-peptides (Amino Acids)
• CoTransport (Antiport) via Na Linked System
• Movement Between Cells
• Di-peptides
• CoTransport (Antiport)
• Pinocytosis
• Poly-peptides
• Pinocytosis

Gut Lumen
Blood
Mono
Mono and Di
Di and Poly
12
Issue of Ontogenic Shifts
Back to Normal
Getting Better
This aint right
Adult Juvenile
Larvae
Increasing Gape Size
Gut Maturation