Efficient shrimp farming equipment for professionals: Nakajima-style MNB fine bubble nozzle.

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MNB Series

last updated：Oct 28, 2026

中島物産

Eat well and grow in a well-balanced environment. Fine bubbles reduce oxygen unevenness, supporting the healthy growth of juvenile shrimp and improving feeding efficiency.

We propose the Nakajima-style MNB fine bubble nozzle to businesses struggling with uneven oxygen distribution and growth variability in large aquaculture tanks. By stirring the rearing water with the discharge flow, we can suppress the uneven distribution of dissolved oxygen (DO), which is expected to reduce stress caused by localized low oxygen levels and promote uniform growth. Shrimp grasp food with their front legs and carry it to their mouths to eat. Large bubbles generated by conventional blower aeration may hinder the feeding of juvenile shrimp. Our nozzle, which utilizes fine bubbles, aims to create an environment that makes it easier for them to grasp and eat food. By standardizing body sizes from nursery to grow-out and feeding with sizes appropriate for their growth stages (feed size), we can reduce leftover feed and improve feed efficiency. *The effects on growth and feeding may vary depending on rearing conditions. It is necessary to design the flow rate and nozzle arrangement according to tank shape, water depth, and stocking density.

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Features - Agitates the rearing water with the discharge water flow to suppress the uneven distribution of dissolved oxygen (DO) in large tanks. - Supports the creation of an environment that is less likely to hinder the feeding of juvenile shrimp with fine bubbles. - Aims to reduce localized hypoxic stress and suppress variations in growth. - Assists in alleviating the burden of feeding management by standardizing body sizes, allowing for the mixing of multiple sizes. 【Usage Scenarios】 - Rearing of juvenile shrimp in nurseries (intermediate growth) - Measures against growth variations in grow-out (main rearing) - Circulation and dissolved oxygen management in large aquaculture tanks 【Effects of Introduction】 - Establishes an oxygen-rich environment to support uniform growth of shrimp. - Makes it easier to select feed sizes appropriate for body size, thereby streamlining feeding management. - Expected reduction in feed leftovers and improvement in feed efficiency. *Mixing feed sizes that do not match body sizes may lead to leftovers and a decrease in feed efficiency (worsening or increase in FCR).