Abalone RAG Evaluation – Ground Truth Q&A
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1. Question:
What is the geographical range of the red abalone?

Answer:
Red abalone range from British Columbia to Baja California, with historically dense populations in central and northern California kelp forests.

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2. Question:
What is the typical asymptotic shell length for red abalone?

Answer:
Tag–recapture studies estimate asymptotic lengths of ~184–232 mm.

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3. Question:
How long does it take for a red abalone to reach legal recreational size?

Answer:
Depending on environment and model, red abalone take 8–20 years to reach the ~178 mm legal size.

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4. Question:
What temperature range supports the fastest juvenile red abalone growth?

Answer:
Mid-teens to high-teens °C support maximum juvenile growth, with mid-size juveniles reaching ~0.1 mm/day.

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5. Question:
Who are the major predators influencing abalone population structure?

Answer:
Sea otters are the dominant predator; others include California sheephead, cabezon, bat rays, octopus, and crabs.

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6. Question:
What caused the collapse of the northern California red abalone recreational fishery?

Answer:
Kelp forest collapse, marine heatwaves, and urchin barrens caused starvation, recruitment failure, and fishery closure.

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7. Question:
Why is white abalone considered critically endangered?

Answer:
Historical heavy fishing and decades of extremely low recruitment reduced densities below recovery thresholds, requiring captive breeding and out-planting.

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8. Question:
How does heterozygosity vary among abalone species?

Answer:
White abalone has the lowest (~0.43%), black and pinto the highest (~1.0%), and red abalone around 0.95%.

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9. Question:
Why do pinto abalone suffer fertilization problems?

Answer:
Low densities cause Allee effects, reducing broadcast-spawning fertilization success.

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10. Question:
Why can the von Bertalanffy growth model be inaccurate for red abalone?

Answer:
It overestimates early growth; flexible models like Richards or Gaussian fit early growth better.

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11. Question:
What environmental factor directly causes abalone starvation events?

Answer:
Large-scale kelp loss from marine heatwaves and urchin barrens.

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12. Question:
Why is post-release survival low in abalone restoration efforts?

Answer:
Predation, limited shelter, and physiological stress lower survival after out-planting.