Two Whale Sharks Strand in Cilacap; Toxicity Suspected

The southern coast of Cilacap, Central Java, has seen two whale shark strandings within a single week, prompting concern and a multi-agency investigation into potential environmental or toxic causes. The unusual frequency of these events has drawn attention to the region's marine health.

The most recent incident involved an 8-meter whale shark found on Banjarsari Beach on May 23, following a smaller, 4-meter specimen discovered on May 17 along the same coastline, approximately six kilometers away. While whale shark strandings are not uncommon in Cilacap, with a cluster occurring in 2022, the recent proximity of these two events has spurred calls for a deeper examination of local environmental conditions.

Darmawan from the Pontianak Marine Management Center noted that strandings can result from various factors, including weather, the animal's health, or collisions with marine objects. A necropsy on the larger whale shark, which measured 8.36 meters and was a juvenile male, revealed plastic debris and small fish in its stomach, alongside five linear wounds suspected to be from a ship propeller. Seawater samples were also collected for analysis.

A coordinated rapid response team, comprising the Indonesian Navy, police, fisheries services, volunteers, and researchers, was mobilized for the evacuation and examination of the carcasses. The complex process of moving the large animal involved heavy machinery and multiple attempts due to its immense weight. Further examinations are underway to ascertain the precise cause of death and to understand the broader implications for marine life in the area.

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Further necropsy examinations are needed to determine the exact cause.