Another Mudskipper Antimicrobial Peptide Shows Broad-Spectrum Bacterial Killing and Fish Protection | Research

The takeaway

Boleokidin39-61, an amphibious fish-derived AMP, showed broad-spectrum activity against Gram-positive and Gram-negative bacteria including MDR strains, with in vivo fish protection.

Broad-spectrum + in vivo efficacy
Boleokidin39-61 kills Gram-positive and Gram-negative bacteria and protects fish from infection

What the researchers found

Boleokidin39-61 exhibited broad-spectrum antibacterial activity including against MDR strains, with confirmed in vivo protective efficacy in fish.

Why it matters

Discovering multiple effective AMPs from the same fish species builds a toolkit of peptide alternatives to antibiotics for aquaculture disease management.

How the study worked

Gene expression analysis in infected mudskipper, peptide synthesis, broad-spectrum antimicrobial testing, and in vivo fish infection protection studies.

What this study cannot tell us

Aquaculture-focused; human therapeutic potential not explored; production scaling challenges.

How to read the evidence

Preclinical aquaculture study — demonstrates practical antimicrobial potential with in vivo validation.

When this study was published

Published 2026 in Journal of Natural Products.

The bigger picture

Amphibious fish, living between water and land, may have evolved uniquely potent immune peptides that provide new templates for antimicrobial drug development.

Questions still open

Could Boleokidin39-61 and Pecbloodin18-37 be used in combination for broader aquaculture disease protection?
What structural features give amphibious fish AMPs their broad-spectrum activity?

Common questions

Why are mudskippers good sources of antimicrobial peptides?

Mudskippers live between water and land, exposing them to diverse pathogens in both environments. Their immune systems have evolved potent antimicrobial peptides to handle this challenge.

Could fish peptides eventually help fight human infections?

Potentially — while these peptides are being developed for aquaculture, the broad-spectrum activity against drug-resistant bacteria makes them interesting templates for human antibiotic development too.

Read the original research

An Amphibious Fish-Derived Antimicrobial Peptide, Boleokidin39-61, with Broad-Spectrum Antibacterial Activity and In Vivo Protective Efficacy.

Journal of natural products

View on PubMed ↗Publisher’s paper ↗

Citation

Bai, Yuqi; Zhan, Jingyuan; Zhang, Weibin; Zheng, Wenbin; Chen, Fangyi; Wang, Ke-Jian. (2026). An Amphibious Fish-Derived Antimicrobial Peptide, Boleokidin39-61, with Broad-Spectrum Antibacterial Activity and In Vivo Protective Efficacy.. Journal of natural products. https://doi.org/10.1021/acs.jnatprod.5c01507