Comparison of Seabass and Grouper Production Costs
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Questions and Answers

What is the main reason trash fish are no longer suitable for human consumption?

  • Low demand
  • High cost
  • Poor handling (correct)
  • Improper storage
  • Why are some growers forced to be creative in sourcing animal protein for feeding crabs?

  • Increased pollution in the water
  • Low market demand for crab
  • Decreasing crab population
  • High cost of trash fish (correct)
  • What does the method of mudcrab pen culture in a mangrove area require?

  • High financial investment
  • Low investment (correct)
  • Intensive pesticide use
  • Excavation and dike construction
  • Extensive tree cutting
  • How do some growers engage in crab cultivation according to the text?

    <p>By purchasing rejected crabs from the market</p> Signup and view all the answers

    What makes mudcrab pen culture a 'mangrove-friendly' aquaculture system?

    <p>Does not require cutting mangrove trees</p> Signup and view all the answers

    What purpose do shallow trenches serve in the mudcrab pen culture method?

    <p>To provide shelters for crabs during low tide</p> Signup and view all the answers

    Which shellfish are affected by the ban imposed during red tide blooms?

    <p>Oysters, mussels, and all other bivalves</p> Signup and view all the answers

    What is the main reason for implementing a complete ban on harvesting and sale of oysters and mussels during red tide blooms?

    <p>To protect public health from potential poisoning</p> Signup and view all the answers

    What is the impact of the shellfish ban on families relying on mussel and oyster production or trading?

    <p>It significantly disrupts their livelihood</p> Signup and view all the answers

    Why was the culture of P.monodon considered only a secondary species before 1951?

    <p>Because only a relatively small quantity could be harvested with milkfish</p> Signup and view all the answers

    Which shrimps are mentioned as being part of a mixed harvest with milkfish?

    <p>Jumbo tiger shrimp, white shrimps, and greasy-back shrimp</p> Signup and view all the answers

    Why is there a higher interest in growing groupers despite the hatchery technology for grouper fingerling production not being at the commercial stage?

    <p>Because the cost to produce a kilogram of grouper is the same as seabass</p> Signup and view all the answers

    Who first advocated the culture of P.monodon as a primary species in 1951?

    <p>Villadolid and Villaluz</p> Signup and view all the answers

    What is the reason mentioned in the text for the late start of seabass and grouper culture in the Philippines?

    <p>Dependence on a constant supply of low-cost trash fish</p> Signup and view all the answers

    What was one of the earliest attempts made by coastal fishers with live groupers that may have been rejected?

    <p>Fattening them in small cages</p> Signup and view all the answers

    Why is there no trash fish as such in the Philippines according to the text?

    <p>Because all caught fish are consumed by Filipinos</p> Signup and view all the answers

    What is an example of a size range mentioned for the market of grouper fingerlings and postfingerlings?

    <p>2-cm long to 15-cm long</p> Signup and view all the answers

    What is one reason mentioned in the text for the diversity in the level of development of different species in the Philippine aquaculture industry?

    <p>Varying culture systems and ecosystems</p> Signup and view all the answers

    What was the total aquaculture production in 1997?

    <p>957,546 mt</p> Signup and view all the answers

    Which species experienced a drop of 44.6% in production due to frequent red tide occurrence?

    <p>Mussels</p> Signup and view all the answers

    What technology development supports the need for the food requirements of cultured stocks?

    <p>Feed development</p> Signup and view all the answers

    Which aquaculture system can harvest as much as 50,000 kilograms in an area measuring no more than 300 m2?

    <p>Intensive marine cages</p> Signup and view all the answers

    What was the average annual growth rate of aquaculture production over the last ten years?

    <p>-5.42%</p> Signup and view all the answers

    Which factor ensures the supply of available seed stock for aquaculture?

    <p>Hatchery development</p> Signup and view all the answers

    What is one benefit of rooted plants in water bodies?

    <p>Serve as food for fish directly or indirectly</p> Signup and view all the answers

    Why do rooted plants help clean up the water?

    <p>They precipitate silt and colloids in the water</p> Signup and view all the answers

    What is one way rooted plants contribute to the ecosystem by providing shelter?

    <p>Providing hiding spots for predators</p> Signup and view all the answers

    What can cause a turnover in water bodies with negative consequences like fish kill?

    <p>Strong winds or heavy rains</p> Signup and view all the answers

    Why might heavy blooms of phytoplankton be harmful to fish?

    <p>They cause off flavor fish due to toxins</p> Signup and view all the answers

    How do rooted plants reduce nutrients from fertile or polluted waters?

    <p>By contributing to nutrient accumulation in the water</p> Signup and view all the answers

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