Fish farming is important to man in the following ways
1. It is a source offish for food. Fish is a good source of protein in human diets.
2. It makes good use of the land that would have otherwise .Milable for arable farming.
3. It serves as a source of employment for fish farmers,
4. It reduces the pressure of fishing in natural waters e.g. rivers, and lakes.
5. It serves as a source of income to fish farmers and traders.
6. Fish farming can lead to the improvement of natural fish stocks Likes, rivers etc. since the young ones can be raised in It heries and used for restocking, trips in the production of sports fish, ii Fish can be produced for use in industrial fishing.
EXCLUSIVE INDUSTRIAL USES OF FISH, READ HERE
Fishes can be classified according to their:
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1. According to Habitat.. read more here
Habitat refers to the living environment of an organism. Fishes water. There are three kinds of water habitat HI which fishes are fresh water, salt water and estuarine habitats.
(a) Fresh water habitat: This refers to water which contains no salt. Such water is found in springs, rivers, ponds, lakes, etc.
Fishes that are found in fresh water habitat are called fresh water fishes .read more on fresh water fishes here Examples include electric fish, moon fish, cat fish as clarias and heterobranchus longifilis, gymnarchus niloticus, and tilapia spp.
Figure 3.9.2: Tilapia galilaeus (St. Peter’s Fish).
(b) Salt water or marine habitat: this refers to water body that has salt taste. Its salt content is about 3% per volume of water. Such water can be found in seas and ocean. Fishes found in salt water or marine habitat are called salt water or marine fishes. Examples include shark, mackerels, herring, sardine, cod (stock fish)
(c) Estuarine habitat: this refers to water found in estuarine where rivers flow into the seas or ocean. Examples is the Niger Delta are of Nigeria. That salt content of this habitat is in between the content of fresh water habitat and marine habitat.
Fishes may not permanently line in this kind of habitat as some do migrate from fresh water or from salt water into the estuaries and go back thereafter. An example of such fishes is mudfish.
According to morphology
This has to do with the form or structure of the fish. There are two categories in this class
(a) Nature of bone: Fishes can be classified according to the nature of bobe
(i) Bony fishes; These posses bony skeletons or hard bones. Examples include Tilapia, mudfish, catfish.
(ii) Cartilaginous fishes: These possess solid bones or what is called cartilage (Biscuit bone). Examples include shark; dogfish.
(b) Nature of body covering: Based on this, fishes can be classified into:
(i) Scaly fishes: These have their body, parts of their head and tail covered by scales which overlap, pointing towards the tail end of the fish. Example is the tilapia galilaeus (See figure 3.9.2).
(ii) Non-scaly fishes- These have no scales. They have smooth shiny skins. Examples are dogfish, mudfish, mackerels.
Other Aquatic Food Organisms
There are many other organisms that live in water
2. Molluscs such as river snail, periwinkle, oyster. They usually covered with shell and these shells serve some useful purposes to man, in addition to their meat.
3. Reptiles such as river snake, turtles, etc.
4. Mammals such as Hippopotamus
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You can read some of most interesting topics below
HERE YOU WILL FIND EVERY AVAILABLE TOPICS ABOUT AGRICULTURAL SCIENCE AND BIOLOGY. AND THE LINKS TO THEIR VARIOUS SOURCES.
1. DEVELOPMENT OF AGRICULTURE
2. IMPORTANCE OF AGRICULTURE
3. SUBSISTENCE AGRICULTURE
4. COMMERCIAL AGRICULTURE
5. PROBLEM OF AGRICULTURAL DEVELOPMENT
6. SOLUTIONS TO POOR AGRICULTURAL DEVELOPMENT
7. AGRICULTURAL LAWS AND REFORMS
8. ROLES OF GOVERNMENT IN AGRICULTURAL DEVELOPMENT
9. AGRICULTURAL POLICIES
10. PROGRAM PLANNING IN AGRICULTURE
35. WILDLIFE CONSERVATION
36. FACTORS AFFECTING LAND AVAILABILITY
39. BIOLOGICAL FACTORS
40. SOCIAL-ECONOMIC FACTORS
41. ENVIRONMENTAL FACTORS AFFECTING AGRICULTURAL PRODUCTION
42. CLIMATIC FACTORS AFFECTING AGRICULTURAL PRODUCTION
47. SOLAR RADIATION
48. BIOTIC FACTOR AND AGRICULTURAL PRODUCTION
52. SOIL MICRO-ORGANISMS
53. SOIL PH
54. ROCK FORMATION
55. IGNEOUS ROCK
56. SEDIMENTARY ROCKS
58. SOIL AND ITS FORMATION
59. FACTORS OF SOIL FORMATION
60. LIVING ORGANISM
61. PARENT MATERIALS
62. SOIL FORMATION TOPOGRAPHY
63. PROCESS OF SOIL FORMATION
65. PHYSICAL WEATHERING
66. CHEMICAL WEATHERING
73. BIOLOGICAL WEATHERING
74. CHEMICAL AND BIOLOGICAL COMPOSITION OF THE SOIL
75. SOIL WATER
76. MICRO AND MACRO NUTRIENTS
77. SOIL MICRO ORGANISM
78. PROPERTIES OF SOIL
79. SOIL STRUCTURE
80. SANDY SOIL
81. CLAY SOIL
82. LOAMY SOIL
83. SOIL TEXTURE
84. IDENTIFICATION OF SOIL TYPES THROUGH EXPERIMENTS
85. RETENTION OF WATER BY VARIOUS SOIL TYPES
86. DETERMINATION OF SOIL PH REACTION
87. COLORIMETRIC DETERMINATION OF SOIL PH LEVEL
88. PH SOIL TEST
89. PLANT NUTRIENTS
90. MACRO NUTRIENTS IN GENERAL
112. THE MAINTENANCE OF SOIL FERTILITY
113. CROP ROTATION
114. APPLICATION OF ORGANIC MANURES
115. FARM YARD MANURE
116. APPLICATION OF INORGANIC MANURE
118. FARMING PRACTICES
119. BUSH BURNING
121. FERTILIZER APPLICATION
122. ORGANIC MANURING
123. FARM YARD MANURE
126. CROP ROTATION
133. FARM POWER AND MACHINERY
134. SOURCES OF FARM POWER
135. HUMAN SOURCE
142. FIELD MACHINES
164. SIMPLE FARM TOOLS
165. AGRICULTURAL MECHANIZATION
166. THE CONCEPT OF MECHANIZATION
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