Caligidosis high surveillance salmon centre number decreases
2016-11-08 15:16:48   copyfrom:    hits:

Salmon affected by sea lice or caligus (Photo: Sernapesca)Caligidosis high surveillance salmon centre number decrea

Salmon affected by sea lice or caligus. (Photo: Sernapesca)

Caligidosis high surveillance salmon centre number decreases

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Tuesday, November 08, 2016, 01:40 (GMT + 9)


The National Fisheries and Aquaculture Service (SERNAPESCA) has published a new report on the health situation in marine centres of the Chilean salmon farming industry, corresponding to the first half of this year.

The report presents an overview of the production situation and the health status displayed in farmed salmon marine centres in the Region of Los Lagos, Aysen and Magallanes and Chilean Antarctica, from week 1 to 26.

The health content is described according to the diseases that have a Specific Health Surveillance and Control Program, which are: the infectious salmon anemia, caligidosis and piscirickettsiosis; statements of mortality classification and results of the Active Monitoring Program (PVA).

With regards to infectious salmon anemia, the report notes it must be considered that the predominant strain of the virus is HPR 0, which reached a prevalence of 29.2 per cent nationwide in the first half of the year.

It also details that in April the HPR8 strain detection was confirmed, which resulted in the centre notification in outbreak category. Given this, a robust surveillance process was set through inspections by veterinary doctors of SERNAPESCA IN addition to the surveillance measures established through the program.

Furthermore, a zoning resolution was published, identifying risk centres, and monitoring was also increased in those cases.

SERNAPESCA stressed that this case was handled under under strict biosecurity measures, which made it possible for the outbreak to be kept confined in the salmon concession groups ACS 21 B.

Regarding the caligus, the report notes that in 2015 and 2016, weekly caligus average load (HO) at the industry level remained with values that are ​​lower than 3.0 HO.

But it adds that this year a decrease in the number of caligus high surveillance centres decreased and in the Aysen region, the average loads HO lower than in the Region of Los Lagos are recorded.

Finally, SERNAPESCA reports that piscirickettsiosis continues to present a seasonal pattern, rainbow trout being the most affected species in prevalence and severity of clinical symptoms.

As for mortality, the health report highlights that in this year's first one, major events of harmful algal blooms (HABs) occurred, mainly in the Region of Los Lagos. And it points out that this situation "caused high mortality rates, modifying the seasonal behavior and the extent of this indicator that had been presented in previous years."

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