small flatfish of the sandy inshore

Size
Length: 30–40 cm, Weight: 0.5–1 kg
Lifespan
8–12 years
Diet
Small crustaceans, worms and molluscs. Lives on sandy and muddy bottoms from 20 to 200 metres depth. A sandy bottom flatfish, often caught as bycatch in the bottom trawl fishery.
Habitat
Sandy and muddy bottoms from 20 metres down to 200 metres, often in the same areas as lemon sole and sand flounder. The flatfish of the deep sand, less common than shallow-water cousins.
Range
North Island and the top of the South Island on sandy and muddy bottoms from 20 to 200 metres depth. Most common in deeper water off the east coast of the North Island.
Endemism
Endemic
Main Threats
Commercial bottom trawling is the primary threat, with bycatch in flatfish and deepwater fisheries. Habitat loss from bottom trawling damaging sandy habitats. Climate change affecting water temperature poses additional risks.
Population
Not Threatened. Common in deeper water around the North Island and the top of the South Island. Often caught as bycatch in bottom trawl fishery, but not targeted by recreational anglers.
Conservation Status
Not Threatened
The lesser-known flatfish of the deeper sand. New Zealand dab looks similar to lemon sole, with a flattened oval body and both eyes on the same side of the head. That is the flatfish design. One eye migrates. The fish flops sideways. The world tilts. The adaptation is radical. The result is functional. It allows the fish to lie flat on the seafloor. Camouflage is total. The perspective is skewed. The upper side is mottled sandy brown with faint darker blotches. A distinctive yellow-tinged belly gives the species its name, flavilatus, meaning yellowish. The underside is clean creamy white. Two sides. Two stories. The contrast is sharp. The upper side blends with the sediment. The lower side remains pristine. It is a study in duality. The biology is specific. The appearance is deceptive. Bottom-huggers of the deeper sand. Dab bury themselves in sediment, leaving only their eyes exposed. They wait for small crustaceans and worms to swim past. Not strong swimmers, they prefer to let the current bring food to them. A lazy strategy, but it works. It has worked for millions of years. The patience is absolute. The energy expenditure is minimal. The reward is steady. The method is ancient. Slow-growing and late to mature, which makes them vulnerable to overfishing. A dab takes years to reach breeding size. Remove too many and the population takes years to recover. That is the maths. The nets do not do maths. The imbalance is stark. The recovery is glacial. The risk is cumulative. The management is reactive. The consequence is long-term. Often confused with lemon sole, the two species are frequently lumped together in catch statistics. Similar in appearance and similar in taste: mild, white and flaky. The fish processor does not care which is which. The consumer does not know the difference. The distinction is academic. The market is indifferent. The identity is blurred. The label is generic. The reality is mixed. The Māori name is not separately recorded. Dab was likely grouped with other flatfish, noticed but not named individually. That is the fate of the less common ones. They get overlooked. The obscurity is functional. The lack of record is historical. The significance is low. The presence is quiet. To catch a New Zealand dab is to catch the deep sand flatfish. The one that lives in darker water on deeper sand, away from the surf and shallows. The flatfish of the deep trawl, the one that shows up in the net alongside lemon sole and sand flounder. A pale yellowish belly flashes in the morning light. The capture is accidental. The identification is difficult. That is the New Zealand dab. Lesser-known, deeper-living and easily confused. A flatfish that does its job, ends up in the net and gets called something else on the label. The existence is obscure. The survival is incidental.