2022/09/28
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Damages caused by red tide / HAB

Damages caused by red tide / HAB

Red tides / HABs cause millions of dollars in damage and losses to aquaculture industry each year all over the world. There are some examples:

Overseas:

Case 1
About US$70 million loss in cultured yellowtail in Japan caused by Chattonella spp. in 1972.

Case 2
Estimated total number of Paralytic Shellfish Poisoning (PSP) cases and deaths from Southeast Asia are 3,226 and 196 respectively from 1976 –1998.

Case 3
More than US$ 35 million loss in salmon farms in British Columbia, Canada and Washington State, U.S.A., caused by Heterosigma akashiwo and Chaetoceros sp. from 1980s to 1990s.

Case 4
About Php100 million with 2,000 tons of cultured milkfish and 10 tons of reef fishes loss in Philippines caused by Prorocentrum minimum and Cochlodinium polykrikoides in 2002.

Hong Kong:

Case 1
HK $ 716,000 and about 10 tonnes cultured fish loss in Hong Kong caused by Gymnodinium sp. in 1982.

 
    Gymnodinium sp.

Case 2
Confiscation of shellfish from markets: Paralytic Shellfish Poisoning (PSP) toxins exceeding the regulatory limit were detected from mussel samples in relation to the bloom caused by Alexandrium catenella in 1989.

 
Alexandrium catenella

Case 3
Most of local marine fish-farms were affected by the massive outbreak of Karenia digitata red tide in 1998 and severe damages and loss of fish were resulted.

 
Karenia digitata

Case 4
Nine fish chulture zones in Tolo Harbour, Long Harbour and northeastern waters were affected by the bloom of Karenia mikimotoi in 2015, resulting substantial loss of cultured fish.

 
Karenia mikimotoi
Karenia mikimotoi
Karenia mikimotoi
 

 

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