Rice-Fish Integrated Farming

The ask

Build a rice-fish integration business that converts conventional rice paddies into dual-output rice-carp polyculture systems — providing smallholder farmers with technical packages (fingerlings, field modification kits, training) and then aggregating and marketing the surplus fish through urban wet markets and supermarkets.

Why now

Rice-fish farming was practiced across Asia for centuries and is now being systematically revived: China has enrolled over 2 million hectares; the FAO's 2023 review certified yield increases of 15–20% on rice and 300–500 kg/ha of fish with zero additional land. The key enablers — affordable polyethylene bunding to create fish refugia, and cold-chain penetration into secondary cities — have both arrived in Bangladesh in the past five years. Climate timing is also right: carp in rice paddies actively eat the golden apple snail, which is destroying paddies in the southwest delta, removing a pest cost.

Why Bangladesh

Bangladesh has 11 million ha of rice paddy and a per-capita fish consumption among the highest in the world (about 25 kg/year), yet inland aquaculture supply is dominated by pond monoculture that degrades soil and groundwater. The haor and beel wetlands already host wild carp populations, meaning local knowledge of the species is deep. The government's National Fish Policy explicitly promotes integrated culture, and BRRI has trial data from Rajshahi and Mymensingh that a commercial player can build on.

As a business

The model has two revenue lines: input package sales to farmer groups (bunding material, fingerlings, feed, and seasonal advisory) and fish offtake aggregation with a margin on urban resale. The aggregation side is where the business compounds — once a cluster of 500+ farmers is producing, the company becomes the dominant local supplier to Dhaka's fish wholesale market, with scale pricing power. Certification as organic or GAP-compliant fish unlocks hotel and export premiums.

Economics

Move the sliders to model your own rice-fish operation. Defaults are order-of-magnitude estimates — pressure-testing them is part of what a founder pitches us.

What ZEPH would back

We want a founder who can operate simultaneously as an agricultural extension agent (convincing farmers to modify their paddies) and a fish trader (running cold-chain logistics to urban buyers). Ideally they have roots in a haor or southwest delta district and an existing relationship with a farmer cooperative. We would back a company that has already onboarded 200 farming households and has a wet-market offtake arrangement in place.

Impact

At 500 enrolled farmers managing roughly 1 ha each, rice-fish integration avoids an estimated 250 tonnes of synthetic fertiliser inputs per year (fish waste supplies nitrogen), cutting associated N₂O emissions against the conventional paddy baseline (≈ 2.7 kg CO₂e per kg urea avoided). Each enrolled farmer household receives an additional 120–300 kg of protein-rich fish per season, materially reducing food insecurity in delta communities. The aggregation business eliminates two to three intermediary tiers, keeping more value with farmers and cutting truck-based spoilage losses. Bangladesh's chronic inland aquaculture pond monoculture degrades soil and groundwater — integrated paddy culture is a structurally lower-impact substitute.