FISHERY RESOURCES

MANAGEMENT

by: Romeo D. Fortes Geronimo T. Silvestre

MANAGING THE INLAND

FISHERY REPORT

PRINCIPLES OF RESOURCE

MANAGEMENT

What is RESOURCE MANAGEMENT./

-is concerned with ASSESMENT, UTILIZATION, and

CONSERVATION of a resource (water resource e.g., lakes, rivers,

swamps, etc.) with the objectives of maintaining the resource to provide the maximum sustainable yield.

ASSESMENT - it includes the collection and evaluation of facts concerning the resource, based on basic statistics on the physical to chemical and biological aspects of the resource. This may also included the socioeconomics, marketing and utilization aspects.

UTILIZATION WATER RESOURCE

water supply

power sources

irrigation

recreation

fishing for human

consumption

transportation

CONSERVATION

- includes the aggregate of the measures rendering possible of optimum sustainable yield from those resources so as to secure a maximum supply of food and other fishery products.

WHAT ARE MEASURES.?

-measures includes the means to enhance production from under-used resources as well as restraining the fishing on over-used resources.

WHAT ARE MEASURES OR STEPS IN MANAGING WATER RESOURCEES TO ENHACE

PRODUCTION.?1. Describing stocks of wild animals and plants

with respect to their abundance migration, distribution, behavior, size, age, composition, rate of growth, and rate of mortality.

2. Describing the environmental factors that limit the stocks.

3. Describing kind distribution, and cost of fishing.

4. Protecting and enhancing the environment.

WHAT ARE THE SIGNIFICANCE OF THESE STEPS.?

-each stocks mentioned, contributes to vital information needed to estimate the yield from the stocks from natural events and amount of fishing. The findings are used for decisions either to encourage harvest of underscored resources or restrain harvest of over-used resources. Data collected may provide information for planning, in order to maximize the utility of the resource. Some environmental changes can be made to enhance the production and evaluate the benefits of environmental changes.

(reference:Royce, W. 1972)

WATER QUALITY AND BIOLOGICAL

PRODUCTIVTY

WHAT IS WATER

QUALITY.?- it includes all physical, chemical, and biological characteristics of water.

WHAT ARE THE PHYSICAL CHARACTERISTICS OF WATER.?

1. TEMPERATURE – is a property that measures the amount of heat absorb by water.2. DENSITY – is mass of water per unit volume.3. COLOR – result from the unabsorbed light rays remaining from incident light.

(a.) TRUE COLOR – is caused by substances in the solution or in colloidal suspension.

(b.) APPARENT COLOR – is caused by suspended particulate matter.4. TURBIDITY – refers to decreased ability of water to transmit light. It measure the transparency of water.

WHAT ARE THE CHEMICAL

CHARACTERISTICS OF WATER.?1. The amount of gases dissolved in water such as oxygen, and

carbon dioxide.2. ph - the amount of hydrogen-ion concentration or it is a measure

of acidity and basicity of water.3. SALINITY – the total concentration of a ionic constituents present

in a water sample.4. Amount of nutrients dissolved in water e.g. phosphorus, nitrogen,

potassium, and other minor nutrients.5. TOTAL ALKALINITY – he total concentration of bases in water

expressed as mg/1 as CaCO3.6. TOTAL HARDNESS – total concentration of alkaline earth ions

expressed as mg/1 as CaCO3.7. TOTAL SOLIDS – the amount of total residue left upon

evaporation.

WHAT ARE THE BIOLOGICAL ASPECTS OF

WATER.? The most critical aspects of biological of water quality is the ecology of phytoplankton and aquatic macrophytes.

PHYTOPLANKTON

.– are minute plants

suspended in the water column.

MACROPHYTES

.– are vascular plants

including floating,

rooted and submerged vegetation,

other organisms,

zooplankton, and other animals

affect water quality too.

WHAT IS BIOLOGICAL

PRODUCTIVITY.?- is the end result of interaction of the organism

and its environment.- it is the outcome of the struggle of the organisms

to exist against the pressures exerted by the environment.

- it is measured in terms of biomass and standing crop per unit of time.

WHAT ARE THE PROBLEMS THAT CAN

OCCUR IF WATER QUALITY IS NOT CONTROLLED.?

1. POLLUTION

2. DISEASE PROBLEM

3. MORTALITY OF AUATIC

ORGANISMS

4. AGING OF LAKE

HOW COULD THESE

PROBLEMS BE

PREVENTED.?

1. Controlling of stocking

rate of natural body of water.

2. Dumping of domestic and

industrial waste into the river or lake should be

avoided.

3. Grasses or trees should be planted in the

vicinity or watershed to

avoid soil erosion.

4. Proper exploitation of resources should be done to ensure a balance of population.

(reference: Boyd, c. 1979)

SAING, JEAN KIMBERLY A.

(BSFI III)