Mon, Jan 30, 2023 page2

• Researchers help increase lobster hatchling survival

  BREAKTHROUGH: A study found introducing shrimp into lobster pools and providing kelp as hiding places can help to reduce cannibalism

  • By Jonathan Chin / Staff writer, with CNA
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  Taiwanese aquaculture researchers have raised the survival rate of lobster hatchlings from 40 percent to 70 percent, the Council of Agriculture’s Taitung District Agricultural Research and Extension Station said.

  The station unveiled the breakthrough at a trade convention in November last year.

  Lobster spawns molt several times in the six months following hatching to reach the postlarvae stage, said Cheng Ming-chung (鄭明忠), an assistant researcher with the Fisheries Research Institute’s Eastern Marine Biology Research Center.

  

  A lobster is pictured in an undated photograph.

  Photo courtesy of Cheng Ming-chung

  Postlarvae are highly sensitive to water quality and fluctuations in environmental factors, and regularly engage in cannibalism, which makes keeping them alive a technical challenge for lobster farms, said Cheng, who led the project to improve lobster farming techniques.

  Taiwanese lobster farms typically import 2cm-long postlarvae harvested from the sea and raise them into 4cm-long juveniles, he said.

  The research team solved the issue of cannibalism by introducing shrimp larvae into the pool for the postlarvae to hunt, while large clumps of kelp provided hiding places, he said, adding that new technologies were used to improve the regulation of water and feed quality.

  The techniques could help farmers raise more lobsters from the same larvae stock, and improve the flavor of the tomalley and the firmness of the meat, Cheng said.

  The researchers used the species Panulirus homarus and Panulirus ornatus in the study, with the former being the more readily available and economic option for Taiwanese lobster farms, he said.

  Using the new methods, the Panulirus homarus could grow from 2cm-long prolarvae to 4cm-5cm juveniles in two months, Cheng said, adding that the juveniles could then be transferred to downstream farms specializing in growing adults.

  Juveniles can grow into market-ready adults weighing 250g to 300g in eight months, he added.

  The Council of Agriculture has unveiled a policy to encourage the use of solar panels on lobster farms with indoor pools, to ensure a stable power supply and water salinity levels at the farms, center director Ho Yuan-hsing (何源興) said.

  Open-air lobster farms are prone to drops in water salinity due to power outages or human error, which could lead to larvae deaths, he said, adding that lobsters are nocturnal animals and thrive in roofed pools.

  Improved aquafarming techniques can reduce the nation’s reliance on imports and the impact of lobster fishing on nature, he said.

  Representatives from the solar energy and aquafarming sectors have expressed an interest in working together, he added.
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