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A Natural Solution for California's Herds: African Catfish Peptides

California's cattle producers and agricultural communities are all too familiar with the rising challenge of antibiotic resistance, making common bacterial infections harder to treat in livestock. But imagine a future where we could tackle these infections with a natural, powerful alternative. Our research points to just that: antimicrobial peptides (AMPs) found in African catfish.

We're really excited about these peptides because African catfish thrive in pathogen-rich freshwater, naturally producing these robust immune compounds in their skin mucus as a defense. This natural origin makes them highly appealing alternatives to synthetic drugs.

Predicted Safety and Potent Action

One of the most compelling aspects of these AMPs is their predicted safety for mammals. Our initial computer analyses suggest that various catfish AMPs are generally recognized as safe (GRAS). We predict they'll be absorbed in the human intestine without causing liver, brain, or heart toxicity. Furthermore, lab tests on a promising peptide, NACAP-II, confirmed it was non-hemolytic, meaning it didn't damage rabbit red blood cells—a strong indicator of its potential safety for mammalian cells.

Beyond safety, these peptides demonstrate effectiveness against problematic bacteria. One study revealed NACAP-II's strong activity against Extended-Spectrum Beta-Lactamase (ESBL)-producing Escherichia coli—a critical concern for both animal and human health due to its resistance to many common antibiotics. Another peptide, ACAP-IV, also showed antibacterial activity against E. coli and Staphylococcus aureus. We believe these AMPs work by directly disrupting bacterial cell membranes, a mechanism that makes it harder for bacteria to develop resistance compared to how they resist traditional antibiotics.

Cooperative Extension Ventura County: Page

Avocado Fruit Set

Under normal growing conditions an avocado tree should begin producing a few fruit in the third year of life, and the number of fruit should increase each year after that until fruit production plateaus at tree maturity. There are several reasons why a tree does not bear fruit.

Cooperative Extension Ventura County: Page

Chilling Hours

Chilling, or exposure to cold, is necessary in many flower and fruit bearing plants, so that they will produce flowers and/or fruit season after season. Plants vary in their need for chilling, and the cold temperatures to which they need exposure also vary.

Cooperative Extension Ventura County: Page

Citrus Fruit Cracking

Fruit cracking in citrus is caused by an uneven or irregular water supply. When citrus fruit takes in water faster than the skin can stretch, the skin cracks. A few cracked fruit are normal, however, if a high percentage of fruit crack, you have an irrigation management problem.

Cooperative Extension Ventura County: Page

Compacted Soil

Upland soils on the Central Coast are composed of wind-deposited materials, i.e., the soils are sand dunes. In their native state, sand dunes are essentially lacking in the nutrients needed to sustain healthy plant life.

Cooperative Extension Ventura County: Page

Compost and Composting

Compost and composting is a subject that often comes up when gardeners get together to discuss gardening strategies.

Cooperative Extension Ventura County: Page

Eucalyptus Mulch

Recent research, in which eucalyptus wood chips were used to mulch avocado trees, showed there was no toxicity to young or old trees. Besides this, the trees used less water, developed a better root system and had less diseased roots than unmulched trees.

Cooperative Extension Ventura County: Page

Fertilizing Potted Plants

I would suggest a water-soluble type of fertilizer with a balanced NPK formula. The brand is not important, however, the formulation should contain at least 10% nitrogen (N) and near equal amounts of phosphorus (P) and potassium (K). A general purpose garden formulation would be good.

Cooperative Extension Ventura County: Page

Fireplace Ash

You can use fireplace ash in your garden, but use it sparingly. Central Coast soils tend to be slightly alkaline. Our water is also slightly alkaline (pH 7.2 to 7.5). Ideal soil pH for growing most plants is 6 to 7. Wood ashes are also alkaline, having a pH as high as 8-9.

Cooperative Extension Ventura County: Page

Fruit Splitting

Several factors may cause fruit to split. The most common cause of cracking/splitting is water. If the fruit is repeatedly wetted by rain or sprinkler water, the drops that hang on the tip of the fruit will lead to cracking.

Cooperative Extension Ventura County: Page

Growing Avocado from Seed

All commercially grown avocados are grafted or budded in the seedling stage. When plants are grown from seed, they usually do not produce fruit which is true to the parent variety.