Status of capture fisheries activities and management in Tri An reservoir, Vietnam
Permanent link
https://hdl.handle.net/10037/335Date
2006-06-02Type
Master thesisMastergradsoppgave
Author
Phan Thanh, LamAbstract
Reservoir fisheries management must be based on an understanding that they are
complex and dynamic ecosystem. This study describes fisheries activities status in the
Tri An reservoir. The main objective is to determine an efficient exploitation level of
fisheries resources affected by the stocking program. The Verhulst-Schaefer model
(logistic growth) was applied and the classic model modified to also include the case
of stocking. The modified surplus production model (MSPM) that considers fish
stocking as a major factor influencing population growth has been employed to
estimate static reference points. Adding economic components to the MSPM, a
bioeconomic model was established and applied in analyzing the interaction between
human harvesting pressures, stocking and biological resources regeneration. Data on
catch/effort and stocking from 1993 to 2005 were used to analyze the fishery.
Empirical results reveal that the stocking program was a major factor influencing both
population growth and the harvest regime in the reservoir. Fish stocking was
positively correlated to change in population growth, and led to a considerable
enhancement in fish production. The fisheries resources cannot sustain current
exploitation levels which have led to both biological and economic overfishing as a
result of ineffective management. The current centralized top-down management has
proven ineffective and inappropriate. Therefore, rational management is required to
rescue the fisheries resources from depletion, to maintain the fisheries productivity
capacity and to prevent further resource degradation. However, reservoir fisheries are
currently dependent on harvesting and stocking regimes, so a change of management
plan should be achieved by simultaneously changing the level of effort and stocking rate
Publisher
Universitetet i TromsøUniversity of Tromsø
Metadata
Show full item recordCollections
Copyright 2006 The Author(s)
The following license file are associated with this item: