1. Fisheries and Marine Science Faculty Brawijaya Universiya, Indonesia
Week: 1 “Fish Physiology” Adopted from: Dr. Eric B. May, Fish Physiology Some General Processes Feeding and Digestion Growth 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 IF I = E Growth = 0 I < E Growth =
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 < E Growth =
I > 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
Cell
Lumen
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
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