Fish Metabolism and Digestive System Quiz

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10 Questions

What refers to the incoming or rising tide?

Flood tide

What refers to the outgoing or falling tide?

Ebb tide

What refers to the time interval between two successive high waters?

Tidal period

What refers to the differences between highest high waters and lowest low waters?

Tidal range

What refers to the differences in height of the two high waters or of the two low waters of each day?

Diurnal inequity

What refers to tides that occur under syzygy condition?

Spring tide

What are extra high spring tides that occur twice a year at the time of vernal and autumnal equinoxes?

Highest high tide

What is a method of determining the height of the tide that involves plotting the tide curve?

Plotting technique

What refers to the area or space provided for ecological consideration as well as physical protection against flooding and wave action, which in the Philippines is at least 100m from the sea?

Sanctioned buffer zone

What is the smallest unit in a pond system where fry are stocked before being allowed to pass to the nursery?

Fry acclimatization pond

Study Notes


  • Triglycerides, sterols, fatty acids, and phospholipids are all types of lipids.
  • Triglycerides are composed of glycerol and three fatty acids.

Vitamins and Minerals

  • Vitamins are organic molecules that act as cofactors or substrates in some metabolic reactions.
  • Vitamins are classified as either fat-soluble or water-soluble.
  • Lipids, proteins, and minerals are also important nutrients.

Digestive System

  • Insulin is important in fish for carbohydrate metabolism.
  • The pancreas plays a crucial role in fat digestion.
  • The ratio of the length of the digestive tract to body length of fish is known as the relative gut length.

Fatty Acids

  • Marine fish oils are dietary sources of essential fatty acids (EFA) of the n-3 series.
  • Freshwater fish from cold water have an essential requirement for fatty acids of the n-3 series.


  • Carbohydrates are a cheap source of energy in aquaculture diets.
  • Carbohydrates also function as a binding agent and enhance palatability of feeds.


  • Fat-soluble vitamins include vitamins A, D, E, and K.
  • Tocopherol is a fat-soluble vitamin.


  • One calorie is equal to 4.184 joules.

Fish Feed

  • Wet feeds include whole trash fish, chopped trash fish, and fish silages.
  • Milkfish is one of the leading commercial producers of milkfish in the world.

Fisheries Education

  • Dr. Deogracias V. Villadolid is known as the father of tilapia sex reversal in the Philippines.
  • The University of the Philippines in the Visayas was the first to initiate fisheries education.

Fisheries History

  • The Bureau of Fisheries and Aquatic Resources (BFAR) was established in 1901.
  • Tilapia is one of the oldest fish culture practices in the Philippines.

Fish Farming

  • Cost of fish production can be improved by improvement of FCR, efficient feed formulation, and proper feeding.
  • Sustainable fish farming practices include maintaining water quality, controlling disease, and optimizing feed.

Water Quality

  • The suitable range of water pH for fish growth is 6.0-9.0.
  • Growth potential of a fish can be exceeded with proper maintenance of growth-related factors.


  • Lernaea is a type of parasitic crustacean that infects fish.

Fish Biology

  • Protogyny is a phenomenon where female species turn into males, commonly seen in the Serranidae family.
  • Ice-ice disease is a health condition of seaweed caused by low salinity, temperature, and light intensity.

Fish Pond Design

  • Perimeter dike design should be based on sound engineering principles and economic feasibility.
  • There are two types of perimeter dike design: for exposed area and for protected area.

Water Management

  • Tertiary canals are built primarily for the purpose of protecting the farm from being flooded with runoff water.
  • Diversion canals are built to facilitate flow-through systems in intensive farming.


  • Spring tide refers to the highest high waters and lowest low waters.
  • Neap tide refers to the average high waters and average low waters.
  • Ebb tide refers to the outgoing or falling tide.
  • Flood tide refers to the incoming or rising tide.

Tide Measurement

  • Tidal range refers to the difference between the highest high water and the lowest low water.
  • Tidal period refers to the time interval between two successive high waters or low waters.

Coastal Management

  • The sanctioned buffer zone is the area provided for ecological consideration and physical protection against flooding and wave action.

Test your knowledge on fish metabolism, including the role of organic molecules, vitamins, and insulin in various metabolic reactions. Also, assess your understanding of the digestive system in fish, such as the ratio of the length of the digestive tract to body length.

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