Sustainable aquaculture and aquatic resources management

Aquaculture Asia Magazine, Vol. XX No. 4, October-December 2015

Published: 27/1/2017 | 613 views

In this issue:

Aquaculture feed supply chain attracting scrutiny. Pond beauty contest, Ram Kumar and social development. Culture modes of giant freshwater prawn in Yangtze River Delta for early harvest. Fish marketing in Kashmir, India - a case study of Srinagar. Community-based integrated fish-duck farming: A boon for rural development in agro-climatic conditions of Assam, India. Gastropod and bivalve fishery of Kakinada Bay, Andhra Pradesh, India: Management and conservation issues.

Guidelines for hatchery production of Pa Phia fingerlings in Lao PDR

Author(s): Ingram, B.A., Chanthavong, K., Nanthalath, T., De Silva, S.S. | Published: 4/2/2016 | 1532 views

This manual provides basic guidelines for the hatchery production of Pa Phia (Labeo chrysophekadion) fingerlings. It provides information on managing and spawning broodstock, genetic guidelines, egg incubation, hatching larviculture and fry rearing. The manual draws on published information on Pa Phia; results of artificial propagation trials conducted on Pa Phia during two projects funded by the Australian Centre for International Agricultural Research and the experiences of technicians at two government hatcheries.

Aquaculture Asia Magazine, Vol. XX No. 1, January-March 2015

Published: 24/12/2015 | 2433 views

Sustainable aquaculture

Peter Edwards writes on rural aquaculture: Further training provided to aquaculturists in Fiji.

Spatial planning for sustainable coastal shrimp production.
Olivier M. Joffre, Pham Dang Tri, Tran Thi Phung Ha, Roel H. Bosma

Research and farming techniques

Availability of grouper (Serranidae) fingerlings and seed in the coral reef of Son Tra Peninsula, central Viet Nam.
Nguyen Thi Tuong Vi, Vo Van Quang, Le Thi Thu Thao, Tran Thi Hong Hoa, Tran Cong Thinh

People in aquaculture
Small-scale carp seed production through portable FRP hatchery at Khanguri, Odisha: A case of technology transfer in remote and inaccessible village.
B. C. Mohapatra, N. K. Barik, S. K. Mahanta, H. Sahu, B. Mishra and D. Majhi

NACA Newsletter

  • Regional consultation on culture-based fisheries developments in Asia.
  • Gender Assessment Synthesis Workshop.
  • NACA participation in the 5th Global Symposium on Gender in Aquaculture and Fisheries, Lucknow, India.
  • Broodstock management in aquaculture: Long term effort required for regional capacity building.
  • Urgent appeal to control spread of the shrimp microsporidian parasite Enterocytozoon hepatopenaei (EHP).

NACA Newsletter October-December 2015

Published: 1/10/2015 | 1324 views
  • Register for the 11th Asian Fisheries and Aquaculture Forum and GAF6.
  • 6th Global Symposium on Gender in Aquaculture and Fisheries.
  • Global Conference on Climate Change Adaptation for Fisheries and Aquaculture.
  • A Review of women's access to fish in small-scale fisheries.
  • Aquaculture operations in floating HDPE cages: a field handbook.
  • Aquaculture seed and feed production and management in Bangladesh: Status, issues and constraints.

Genetic considerations in culture-based fisheries development in Asia

Author(s): Nguyen, T.T.T. | Published: 12/5/2015 | 2158 views

Culture-based fisheries (CBF) is a practice in which, in general, fish are stocked in small water bodies that are unable to sustain an artisanal fisheries through natural recruitment. CBF has gained popularity in recent years, due to its simplicity in terms of inputs and management and cost effectiveness. Traditionally, in the Asian region, exotic species are used, but countries newly embarking on CBF prefer the use of indigenous species. The shift towards the use of indigenous species was believed to counter negative impacts, perceived or otherwise, brought about by use of exotic species. However, it is also true that hatchery-produced fingerlings that escape can also pose a potential threat to genetic diversity and integrity of their wild counterparts.

At the Regional Workshop on “Culture-based fisheries development in Asia” (this volume), it was clear that the debate on the use of exotic versus indigenous species is still an ongoing topic. This paper entails the pros and cons in the use exotic vs. indigenous species in CBF and steps to be followed when decisions are made on species choice for CBF. The ultimate goal is to improve production whilst maintaining genetic diversity and integrity of the surrounding ecosystems.

Aquaculture Asia Magazine, July-September 2014

Published: 1/5/2015 | 2005 views

Sustainable aquaculture

Peter Edwards writes on rural aquaculture: Commercial tilapia farming at ‘take-off’ point in Fiji

Research and farming techniques

Tank based captive breeding and seed production of the pearlspot (Etroplus suratensis)
Biswas, G., Sundaray, J.K., Ghoshal, T.K., Natarajan, M., Thirunavukkarasu, A.R., Kailasam, M. and Ponniah, A.G.

Cage culture of the native cichlid, Etroplus suratensis (pearlspot) in Kerala, India; A laudable initiative towards emergence of small scale cage culture
Pramod Kiran R.B., Baiju, A., Krishna Sukumaran, Neetha Susan David, Bijukumar, A. and A.R.T. Arasu

NACA Newsletter

  • Culture-based fisheries exchange visit from Lao to Cambodia
  • National Fish Day, Cambodia
  • WAS Adelaide: Special Session on Regional Cooperation for Improved Biosecurity
  • Inbreeding and disease in tropical shrimp aquaculture: A reappraisal and caution
  • Shrimp EMS/AHPND Special Session at DAA9
  • 2nd International Symposium on Aquaculture and Fisheries Education

NACA Newsletter, April-June 2015

Published: 3/4/2015 | 1704 views
  • 12th Technical Advisory Committee held in Cha-am, Thailand.
  • Audio recordings: WAS special session on regional cooperation for improved biosecurity.
  • AFSPAN Final Technical Report now available!
  • Pillay Aquaculture Foundation Awards for Scientists in Least Developed Countries.
  • Gender seminar conducted and ASEAN Gender Network launched.
  • A two-tube, nested PCR detection method for AHPND bacteria.
  • 9th Regional Grouper Hatchery Production Training Course.
  • Developing an environmental monitoring system to strengthen fisheries and aquaculture in the Lower Mekong Basin.
  • Asia-Pacific Regional Workshop on the Status of Aquatic Genetic Resources for Food and Agriculture.

NACA Newsletter, January-March 2015

Published: 16/3/2015 | 2164 views
  • Regional consultation on culture-based fisheries developments in Asia
  • Gender Assessment Synthesis Workshop
  • NACA participation in the 5th Global Symposium on Gender in Aquaculture and Fisheries, Lucknow, India
  • Broodstock Management in Aquaculture: Long term effort required for regional capacity building
  • Urgent appeal to control spread of the shrimp microsporidian parasite Enterocytozoon hepatopenaei (EHP)

NACA Newsletter, July-December 2014

Published: 3/11/2014 | 2301 views
  • Culture-based fisheries exchange visit from Lao to Cambodia.
  • National Fish Day, Cambodia.
  • WAS Adelaide: Special Session on Regional Cooperation for Improved Biosecurity.
  • Inbreeding and disease in tropical shrimp aquaculture: a reappraisal and caution.
  • Shrimp EMS/AHPND Special Session at DAA9.
  • 2nd International Symposium on Aquaculture and Fisheries Education.
  • Report on Sustainable Fisheries and Aquaculture for Food Security and Nutrition.

Proceedings of the Expert Consultation on Genetic Erosion Risk Analysis for Shrimp Diseases in Asia

Published: 27/1/2014 | 3144 views

Shrimp aquaculture in tropical regions is facing a disease-induced catastrophe of lost production.  It is estimated that more than 40% of tropical shrimp production is lost to disease annually. The devastating impacts of disease on lost incomes, livelihoods, increased operational costs, trade restrictions and loss of consumer confidence has been a subject of many consultations and policy dialogues.  Discussions of disease crisis have to date been largely focused on identification of pathogens, guidelines and standards for disease detection and surveillance, regulations to limit trans-boundary movement of animals, and adoption of better management practices. 

There is reason to believe that current broodstock management practices may induce genetic erosion that increases susceptibility to disease and vulnerability to epizootics:

  1. Broodstock management as it is currently conducted in SE Asia, particularly by secondary and small-scale hatcheries, is likely to cause rapid accumulation of inbreeding and loss of genetic diversity ("genetic erosion") at farm level;
  2. Inbreeding increases susceptibility to diseases and lowers the threshold for the outbreak of epidemics. This effect may be especially strong in shrimps;
  3. Separately from its correlation with inbreeding, declining genetic diversity also increases the incidence of epizootics (the monoculture effect) and impedes the ability to adapt to stressful environments and changing climate;
  4. These epidemiological effects of climate stress and inbreeding are likely to be multiplicative;
  5. The possible role of genetic erosion in the incidence and prevalence of diseases and epizootics are not included in current discussions of the disease problem in tropical aquaculture.

The basic tenet for this Expert Consultation is that an important aggravating factor in the disease crisis is an agro-economic system that locks shrimp breeders, hatcheries and farmers into behaviour that induces high levels of inbreeding.  If inbreeding does increase the severity and frequency of epidemics, this disease crisis will only get worse over vast areas of Asia, Central and South America, Africa and the Middle East until  it is addressed.

This Expert Consultation was organized in conjunction with the annual meeting of the NACA Aquatic Animal Health Advisory Group (NACA-AG) to take advantage of the physical presence and expertise of a small group of world renowned Aquatic Animal Health experts from several national and international institutions. The list of participants and workshop agenda are presented in Annexes 1 and 2.  This consultation is perhaps the first of its kind to bring together a balanced group of experts from diverse fields – epidemiology, microbiology, disease diagnostics & surveillance, aquaculture genetics, fish breeding, and evolutionary biology – to take a fresh, in-depth, and wider perspective on the possible interaction between genetic side-effects of broodstock management and the looming threat of aquatic animal diseases, in particular the contemporary shrimp disease crisis. 

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