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3 Progress of Joint Research Activities
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Research No.: ⑰⑰ F-1 ODA Loan Joint Research Date: Oct. 15 , 2020
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Climate change: Impacts and adaptation
1 General Title
in aquaculture and fisheries
Can Tho University (CTU): Nguyen Thanh Phuong (Leader), Do Thi Thanh Huong, Truong Quoc Phu,
Dang Thi Hoang Oanh, Tran Thi Thanh Hien, Vu Ngoc Ut, Ha Phuoc Hung
2 Core Members Japanese Universities: KANEKO Toyoji (the University of Tokyo) , TAKAGI Yasuaki, KASAI Hisae,
YOSHIMIZU Mamoru and IMAI Ichiro (Hokkaido University), SANO Motohiko, KATO Goshi and
HAGA Yutaka (TUMSAT), ISHIMATSU Atsushi (Nagasaki University )
3 Duration May 2017 – Oct. 2020 (3 years and 6 months) <Kick-off>
Main The general aims of project are to evaluate the effects of climate change on (i) features of physiology, nutrition and health of
4 aquatic animals in the Mekong delta, since then finding the solutions for management and development of suitable cultured
Objectives systems; and (ii) efficiency of coastal fisheries at the Mekong delta
A. RESEARCH CONTENT

From the top: striped catfish, mud
crab, red tilapia and snakehead
B. PROGRESS OF THE STUDY
3. Assessment the effect of temperature and salinity on
1. Study on the tolerance and adaption of selected feeding and feed utilization of selected farmed fish
species to increased salinities and elevated crustacean species:
temperature: - Increase salinity at 28 and 31°C significantly reduced growth
5 Focal Points - The fry of snakehead, at the 0 and 3‰, fish growth were higher performance and feed utilization of hybrid red tilapia. Increase
than the other treatments; the survival rate was highest at
3‰. water temperature to 34°C at all level of salinities enhanced red
- The fry striped catfish can be better reared at temperatures tilapia growth as in fresh water.
- Amino acid and fatty acid profile of red tilapia and
from 27 to 33°C, and the optimum one is 30°C. The higher snakehead under high water temperature salinities were
survival rates were 27.9% and 32.9% at 27 and 30°C determined.
treatment. - Energy partitioning of snakehead and red tilapia were
- The tolerance range of temperature of juvenile mud crabs was determined.
quite large (from 8.5℃ to 41.3). The growth and survival rate
of mud crabs were high at 30-31℃ (50.3%). The survival rate 4. Study on the effects of salinity changes on plankton
reduced when the temperature increase 33-34℃. population of selected ecosystem in the Mekong Delta:
Obvious effects of salinity on plankton and bacteria profile
2. Study on the effects of salinities and elevated were recorded in both Hau and My Thanh River:
Dinoflagellates which contain several toxic algae species
-
. temperature on health and production of striped catfish
and white-leg shrimp: oriented occurrence more with increased salinity. are
- Protozoa and copepod composition and abundance
- In salinities of 11 and 14 ppt, striped catfish were more directly proportional to salinity whereas rotifers and
susceptible to E. ictaluri compared to lower salinities.
cladocerans are inversely proportional to salinity.
- Common diseases appeared in shrimp culture areas include: - Vibrio spp. and V. parahaemolyticus which are shrimp
(1) atrophy and pale-colored hepatopancreas along with the
pathogens are positively correlate with salinity.
empty or little food in the mid gut; and (2) slow growth, HP 5. Production and profitability of the coastal capture
atrophy and gut with discontinued food. Those increased fishery:
proportional to water temperature.
- White leg shrimp in salinity of 35ppt were more susceptible to - Fishermen showed awareness to climate change, however,
adaptation solutions have to be advised.
V. parahaemolyticus compared to shrimp in salinity of 10ppt.
- A machine learning to predict AHPND development with 15 - Inshore fishing have been still popular though low efficacy
and negative resource impact have been notified,
key variables was used to train the models, it can help to fishermen keep going due to their livelihood.
predict AHPND outbreaks in shrimp farms.
- Shifting to other works has not been well implemented
because of low education levels and inefficient use of loan
6 Comments The project are progressing well including field and in-house (experimental) works. There have been a lot of interesting results
obtained which hope to be able to publish papers on national and international journals.
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