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Image: Sernapesca / FIS
Mass mortality of salmonids in the Reloncaví Estuary
CHILE
Friday, November 17, 2023, 01:00 (GMT + 9)
The National Fisheries and Aquaculture Service (Sernapesca) of the Los Lagos region reported that on November 14, 13 salmon farming centers belonging to ACS 1 (Reloncaví Estuary) reported the activation of the Algal Blooms contingency plan Harmful (HAB) in the presence of the microalgae Thalassiosira pseudonana, at levels considered harmful to fish.
Subsequently, 7 of the centers also activated their contingency plan for mass mortality associated with the presence of microalgae. After the analysis of the information by Sernapesca, it was determined that only 2 centers are in this condition, since the other 5 cases do not correspond to mass mortality events due to the magnitude and management already reported.
 The Regional Director of Sernapesca Los Lagos, Cristian Hudson, indicated that “from Sernapesca we are monitoring and supervising in person, remotely and documentary compliance with the contingency action plans of each affected farming center, in coordination with the institutions. that make up the regional CIICA. Up to the minute, the situation is being normally addressed through the capabilities available to the owners of the affected centers to address this type of events. For our part, we will maintain surveillance until the contingency is closed."
From Sernapesca they indicated that this algal bloom does not correspond to the so-called red tide, and therefore there is no impact on bivalve mollusks or other fish.
 From IFOP, Dr Leonardo Guzmán, expert in algal blooms, explained that “in spring there are ideal light and nutrient conditions, which favors the increase of these microalgae. The available information does not allow us to link this flowering with the El Niño event that currently affects the north of our country. “The CREAN IFOP will continue to monitor, as it has been doing since 2006, the entire inland sea of the Los Lagos region, including the regions of Aysén and Magallanes.”
Although this algal bloom is not a direct consequence of El Niño, Sernapesca has been reporting since September on the possible effects that it may generate, through workshops in the regions of Los Lagos, Aysén and Magallanes, in addition to carrying out work collaborative and coordinated by the national and regional Interinstitutional Committees on Environmental Contingencies (CIICA), where the Ministries of Health, Economy, Interior, Environment, Navy, SUBPESCA, Sernapesca, Superintendence of the Environment, and SENAPRED, IFOP, as well as presidential delegations, participate.
Source: Wiki / FIS
Additionally, last week Sernapesca published the aquaculture pre-alert that establishes exceptional measures in the event of possible events of mass mortality of salmonids generated by harmful algal blooms..
Source: Sernapesca (Translated from the original in Spanish)
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