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Overview of marine ranching in Chile

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Reduction of coastal fish resources is common problem in the whole world due to overfishing. Qn the other hand, demand is rising due to health consciousness (less cholesterol), contamination of chicken (influenza), cow (BSE) and pork (HEV). Marine ranching is the one of solution to recovering coastal fish resources which has operated in Japan more than four decades. The result shows that some fishes are recovered, even increased, and contribute benefits. Chile coast water has higher productivity compare to Japan and the method produce more fishes quickly. It may create new business model which has less energy consumption, no contamination and sustainable production, and create employment at rural area. 1.             What is Marine ranching 1.1.              Idea and activities General ideas of marine ranching are releasing fish juvenile dismissing species int...
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Mussel larvae production for Pacific beakfish larvae (Oplegnathus insignis)

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Mussel larvae production for Pacific beakfish larvae ( Oplegnathus insignis ) Masatoshi F UTAGAWA * ¹ Septiembre 17, 2012 *¹ Corporación Privada para el Desarrollo de la Universidad Arturo Prat, CORDUNAP, Iquique, Chile Mussel larva shows 50 m m approximately and swims freely. The size is ideal for primary live feeds for O. insignis larva. Mussel larvae are fed at density 50 larvae/ml with 6 hours interval from Day 3 to 10. Additionally, the larva has advantages of well nutrition and easy production. This method produces 30 million mussel larvae from a female at 30 hours after fertilization. The larvae survive until D2 and eggs settle on larva tank within 6 hours approximately. 1.    Mussel gonad shows that male has cream color and female has coffee color. 2.    Insert knife below the hinge, cut ligament and open shells. Press male gonad to release sperm and keep in bucket (A) with 10 L of ...
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Incubatuin of phytoplankton

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Incubation of phytoplankton ( Nannochloropsis sp., Chaetoceros sp. and T-ISO) Masatoshi Futagawa/CORDUNAP January 17, 2013 Phytoplankton are primary live feeds for shellfish larva and rotifer. And rotifer as live feeds for finfish larva that contains HUFAs which is essential to marine fish larva. Thus, constant phytoplankton production without contamination of protozoans is one of key factors to produce the larvae. Recently, there are some substitute products of phytoplankton such as dry phytoplankton and enrichment material which HUFAs concentrated. Even so, live phytoplankton is the best material for larvae culture as of present. I will introduce typical phytoplankton incubation method that is practiced for scallop larva culture in our hatchery. 1.     Medium preparation 1.1.   Seawater is filtered by fiber filters (500, 100, 50, 10, 1 and 0.5 µm) and sterilized by UV at hatchery. The water is filtered again by membrane filter (0.45 µm, Advantec...
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