spiny dogfish, outlasts every fishery

Size
Length: 60–100 cm, Weight: 2–7 kg
Lifespan
30–50 years
Diet
Feeds on small fish, squid and crustaceans. Hunts near seafloor using electroreception. Uses sharp teeth to grab slippery prey. Feeds most actively during twilight hours and at night in coastal waters.
Habitat
Shallow coastal waters, harbours and estuaries from 10 to 200 metres depth. Prefers sandy and muddy bottoms with moderate currents. Often found in large schools near seafloor during day.
Range
Coastal waters of North and South Islands from Northland to Stewart Island. Most common in harbours, bays and along open coastlines. Also found in temperate waters worldwide in both hemispheres.
Endemism
Native
Main Threats
Commercial overfishing is primary threat. Targeted for fish and chips sold as lemon fish or rig. Slow reproduction makes populations highly vulnerable. Bycatch in set nets and bottom trawls impacts stocks.
Population
Global populations declined significantly due to overfishing. Listed as Vulnerable by IUCN. Managed under quota system in New Zealand. Stock assessments indicate localised declines. Recovery is extremely slow due to late maturity.
Conservation Status
Not Threatened
A venomous spine sits in front of each dorsal fin. The spiny dogfish carries its defence like a warning. Two sharp spines can deliver a painful sting to unsuspecting handlers. Touch the wrong spot and it will be known. The pain is immediate. The lesson is lasting. The shark does not seek conflict. It merely exists. The spines are part of that existence. They protect the soft flesh. They deter the careless. Despite this defence, the firm white flesh is highly valued. It appears in fish and chip shops across the country. Sold as lemon fish or rig. A shark that becomes something else on the menu. A predator that hides its identity behind a friendly name. The consumer rarely knows the source. The label is benign. The reality is cartilaginous. The transformation is culinary. Not biological. The taste is mild. The texture is firm. The demand is steady. The many Māori names reflect its importance across New Zealand. Kaaraerae, Koinga, Mangohapu, Makohuarau, Mangoo-tara and Okeoke all refer to the same species. These are regional variations in language and tradition. A shark that was known everywhere. Because it was everywhere. The distribution was wide. The recognition was universal. The utility was clear. It fed the people. It provided tools. The spines were sometimes used as needles. The body was not wasted. The knowledge was local. The names persist. Global populations have collapsed from overfishing. The spiny dogfish can live for half a century. It grows slowly. It produces very few young. It is one of the most vulnerable sharks in the ocean. The biology is ill-suited to industrial extraction. The lifespan is long. The turnover is low. The recovery is difficult. In New Zealand it is managed under the quota management system. Size limits and catch limits apply. The regulations are strict. The pressure remains. Recovery is extremely slow. The generations are spaced far apart. The loss of a breeding female has long-term consequences. The stock does not bounce back. It creeps forward. Inch by inch. Year by year. The management attempts to balance use and conservation. The balance is precarious. The global context is dire. Many regions have seen collapse. New Zealand fares better. But not well. The trend is downward. Or static. At best. A venomous shark with many names. Sold as something else on a plate. Fighting for survival in a world that fishes too hard. That is the spiny dogfish. And it is not fine. The situation is critical. The response is measured. The outcome is uncertain. The shark carries on. With its spines. With its slow growth. With its vulnerability. It persists. For now.