Presumption of Illegal Fishing: What Fishermen Need to Know About Dynamite Fishing Laws in the Philippines

The Supreme Court's 1998 ruling in Argoncillo v. Court of Appeals (G.R. No. 118806) clarifies a critical rule for fishermen: under Philippine law, finding fish killed by explosives in a fishing boat creates a legal presumption that those aboard were engaged in illegal fishing. This article explains the ruling, the burden of proof, and the penalties involved.

The Facts of the Case

In May 1990, a team of law enforcers from the Bureau of Fisheries, local police, and barangay officials conducted a sea patrol in Ivisan Bay, Capiz, following reports of rampant illegal fishing. Around 6:30 in the evening, they heard an explosion and proceeded to investigate.

Upon arrival, they found six men near an islet. Three were in the water retrieving fish and throwing them into a small banca, while three others stood on the rocky shore. The team recovered seven fish samples from the banca. External and internal examinations by fishery technicians revealed signs consistent with explosives: blood oozing from the operculum (gill cover), protruding eyes, ruptured air bladders, broken vertebral columns, and blood clots in the abdomen.

No dynamite or paraphernalia was found. Three of the accused were convicted, while three were acquitted. The convicted fishermen appealed, arguing that the absence of explosives in their possession indicated their innocence.

The Legal Presumption Under P.D. 704

The Supreme Court rejected this argument. Under Section 33 of Presidential Decree No. 704, as amended by Presidential Decree No. 1058, the law creates a specific presumption: when fish caught or killed by explosives are found in a fishing boat, it is presumed that the owner, operator, or fisherman was fishing with explosives.

This presumption is prima facie — meaning it can be rebutted by the accused. However, the burden shifts to the defense to present credible evidence contradicting the presumption.

In this case, the Court held that the presumption was clearly established. The fish samples were examined by trained Bureau of Fisheries personnel who found the tell-tale signs of blast fishing. The accused's bare denial that they used a fishnet called "patuloy" was insufficient to overcome the scientific evidence.

The Court's Rejection of Defense Arguments

The petitioners raised several defenses, all of which the Court found unpersuasive:

No explosives found. The Court noted that it was "quite probable" the accused dumped the materials into the sea as the patrol approached. The law does not require the actual discovery of explosives when the fish themselves show signs of blast injuries.

Not all fish were examined. The Court called it "ridiculous" to expect every fish to be examined. A random sample is sufficient.

The fish were "deep sea" fish caught in shallow water. The Court clarified that the term "deep sea fishes" was actually a mistranslation by the trial court. The witnesses described the fish as "isda sa bato" or "bottom feeders," which are found near rocky areas and shores.

Non-flight indicates innocence. The Court stated there is no doctrine that non-flight always indicates innocence. The accused could not have escaped anyway, as they were identified by the barangay captain and outnumbered by law enforcers in two pumpboats.

The Proper Penalty: Indeterminate Sentence

The trial court imposed a straight penalty of 20 years imprisonment. The Supreme Court corrected this error. Under Section 38(a)(1) of P.D. 704, as amended, illegal fishing with explosives carries a penalty of 20 years to life imprisonment.

The Court held that the Indeterminate Sentence Law applies mandatorily to offenses under special laws where the penalty exceeds one year. The exceptions — such as offenses punished by death or life imprisonment — did not apply here because the penalty range was 20 years to life, not a fixed penalty of life imprisonment.

The Court modified the sentence to an indeterminate penalty of 20 years as minimum to 25 years as maximum. (Note: The specific statute number for the Indeterminate Sentence Law is not available in the ASG law library, but the ruling's application of the principle is clear from the decision text.)

Practical Takeaways

• The presumption is powerful. If authorities find fish with blast injuries in a fishing boat, the law presumes illegal fishing. Fishermen must present credible rebuttal evidence, not just denials.
• The fish themselves are evidence. External signs (protruding eyes, blood from gills) and internal signs (ruptured air bladders, broken spines) are recognized indicators of dynamite fishing.
• No dynamite needed for conviction. The absence of explosives at the scene does not defeat the presumption, as suspects may have discarded them.
• Penalties are severe. Illegal fishing with explosives carries imprisonment of 20 years to life. Courts must impose an indeterminate sentence under the Indeterminate Sentence Law.
• Legal representation matters. Conviction can rest on technical evidence and presumptions. Fishermen facing charges should seek counsel who understands fisheries law and evidentiary rules.

This article is general information and not legal advice. For your specific situation, consult a lawyer or ask ASG Legal AI.