Transporation of fish seed
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The document discusses the transportation of fish seed, highlighting methods to reduce mortality during transit and outlining the general guidelines for safe transport. It categorizes packing methods into open and closed systems, detailing their respective advantages and disadvantages. The text concludes with emphasizing the importance of proper techniques and vigilance to ensure the healthy arrival of fish seed at their destination.
Transporation of fish seed
- 1. TRANSPORTATION OF FISH SEED SUBMITTED BY – ANURADHA NASKAR DEPARTMENT OF ZOOLOGY AND APPLIED AQUACULTURE BARKATULLAH UNIVERSITY BHOPAL, MADHYA PRADESH, 462026
- 2. CONTENTS • INTRODUCTION. • GENERAL GUIDELINES FOR FISH SEED TRANSPORTATION. • CAUSES OF MORTALITY IN TIME OF FISH SEED TRANSPORTATION. • METHODS OF PACKING AND TRANSPORTATION. • OXYGEN REQUIREMENT. • CONCLUSION. • REFERENCES.
- 3. INTRODUCTION • The transfer of fish seed from the hatchery or place of collection to the rearing pond is called transport of fish seed. • The seed fish include fry and fingerlings. • Mortality is the major problem of traditional transport system of fish fry, due to accumulation of toxic wastes such as ammonia, decrease in pH due to increase of CO2, depletion of O2 in the water, thermal tolerance hyperactivity, stress and tiredness of the fry and infection contracted during transportation. • Formerly seed fishes were transport only for short distances with a duration of maximum of 8 hours. • Now seed fishes are transported through train, air and ship.
- 4. GENERAL GUIDELINES FOR FISH SEED TRANSPOTATION • Transportation early in the morning is better (cool hour). • The water used in transportation should be cool and clean. • Number of fish seeds per transportation unit should be maintained. • Oxygen packing is the best method of transportation. • Care should be taken so that no direct sunlight falls in the packing bags during transportation. • The seed packing bags should be covered with the wet gunny bags. So that, temperature of the seed packing bags will be maintained low. • Physiological requirement of fish seed is presence of high DO and less CO2 concentration, temperature is maintained 22-23°c and required pH is 7.5-8.5.
- 5. CAUSES OF MORTALITY DURING TRANSPORTATION • Depletion of dissolved oxygen in ambient water due to the respiration of fish and also due to oxidation of any organic matter (BOD load), including excreted waste of the fish by micro-organisms. • Accumulation of free carbon dioxide, resulting from respiration and ammonia as excretory end product. • Sudden fluctuation in temperature. • Hyperactivity and stress due to handling. • Ion-osmotic imbalance due to stress. • Physical injury due to handling before transport and during transport.
- 6. METHODS OF PACKING AND TRANSPORTATION Transport system are of two types : a) Open system comprising open carries, with or without artificial aeration/oxygenation/water circulation. b) Closed system having sealed air tight carries with oxygen.
- 7. OPEN SYSTEM • The simplest transport carries is the earthen vessel, such as the traditional “HUNDI” used in Bengal in India. • Open packing system for transport of fish seed is going out of fashion mainly because it involves continuous vigilance and frequent renewal of water during long journeys. • Galvanized iron drums of 180 L capacity, and open canvas containers ( 1 m X 1 m X 1.25 m) have been used successfully in transporting breeders. • The galvanized iron drums are provided with an opening of 48 m X 30 cm along the main body of the container for introduction of fingerlings and larger fish. • The drums is often lined inside with foam rubber to avoid injury to the buffering fish during transport. • Recently plastic pools (250 liters and other sizes) have also been used for transporting fish.
- 8. Advantages :- The earthen HUNDI is now being replaced by aluminium vessels which are unbreakable, but the earthen hundies have the advantages that they keep the temperature of the water inside cool by means of evaporative cooling. Disadvantages :- 1) The seed get heavily stressed. 2) It suffer mortality during transport or soon after stocking.
- 9. Open system
- 10. CLOSED SYSTEM In this system the water surface is exposed to compressed air or pure oxygen introduced to fill the zone over the water surface in the carriers. In a metal container of galvanized iron (45 X 35 X 35 cm) with two airtight openings, one to let in oxygen and other to let out water. 100-200 fingerlings of 7-10 cm, or 30-40 fingerlings of 13-20 cm length can be transported for a journey of 12 hours. 18 liter tins with airtight screw-capped lids for filling and provided with tubes for drawing in oxygen and letting out water, have been used in CIFRI, Barrackpore, for transporting 1000 fry of 1-2 cm length during a 20 hour journey.
- 12. • Oxygen requirement ranges from 100-1100 mg/kg/hours. • Oxygen consumption is not a standard value. • It depends largely on fish species, size of fish, physiological condition of individual and on several environmental factors. OXYGEN REQUIREMENT
- 13. CONCLUSION Fish seed needs intensive care for transportation. Any types of mishandling may lead to the loss. So, we need to stay very attentive at the time of transportation. A fish farmer must be very familiar with the principles technique and practice of fish transportation. The aim of transportation is to provide healthy live fish at the destination. Almost any clean and water proof container is to be used. Doing of all works successfully help us to make profit in future.
- 14. REFERENCES 1. Aquaculture and Fisheries – Dr. N. Arumugam. 2. An Introduction to Fishes – S. S. Khanna. 3. A text book of Fishery Science and Indian Fishery – C. B. L. Srivastava. 4. Internet.