deep southern cod, rough and dependable

Size
Length: 40–60 cm, Weight: 1–2 kg
Lifespan
10–15 years
Diet
Feeds on small fish, squid and crustaceans. Hunts near seafloor using streamlined body. Uses large mouth to capture prey. Feeds most actively at night. Swims with slow steady motion near bottom.
Habitat
Rocky reefs and sandy bottoms from 10 to 100 metres depth. Prefers sheltered bays and harbours with mixed substrate. Often near wharf piles, rocky outcrops and underwater caves. Absent north of Cook Strait.
Range
Coastal waters of South Island and southern North Island from Cook Strait to Stewart Island. Most common in harbours, bays and along rocky coastlines. Also found in southern Australia and Tasmania.
Endemism
Native
Main Threats
Bycatch in set nets, bottom trawls and rock lobster pots. Recreational fishing pressure in some areas. Habitat loss from coastal development. Climate change affects near-shore reef habitats and water temperatures.
Population
Populations considered stable across most of range. Not targeted commercially but caught occasionally by recreational fishers. No formal stock assessment exists. Localised declines may occur in heavily fished harbours.
Conservation Status
Not Threatened
The name is unfortunate. Bastard cod sounds like an insult. But it is just a name. And this fish did not choose it. The southern bastard cod is the southern equivalent of the northern bastard cod. A member of the morid cod family. Distinct from the true cods of the North Atlantic. Found only in the South Island and southern North Island. As its name suggests. It does not occur in warmer northern waters. The south is its home. It does not leave. The boundary is strict. The preference is clear. The firm white flesh is similar to other cods. But it is rarely seen in fish shops. That is because it is caught only as bycatch. Not targeted. Just an accidental visitor to the deck. Several related bastard cod species live in New Zealand waters. Each has different geographic ranges. This one is for the south. The others stay north. Or deeper. The distribution is partitioned. The niche is specific. The identity is regional. It lives in harbours, bays and along rocky coastlines. It prefers sheltered bays with mixed substrate. Often found near wharf piles, rocky outcrops and underwater caves. It hunts near the seafloor at night. Slow and steady. Using a large mouth to capture small fish, squid and crustaceans. Not a sprinter. A patient lurker. The strategy is ambush. Not pursuit. The energy cost is low. The reward is sufficient. The darkness provides cover. The structure provides hiding spots. Populations are considered stable. No formal stock assessment exists. That is the pattern for bycatch species. No one assesses them until they are gone. Localised declines may occur in heavily fished harbours near Dunedin and Christchurch. The nets do not discriminate. The cod dies alongside the target species. The collateral damage is accepted. The data is sparse. The management is reactive. Not proactive. The risk is unquantified. But present. The Māori name is not recorded. Another bottom-dwelling fish. Known but not celebrated. Part of the background of the harbour. The obscurity is total. The recognition is minimal. The utility is incidental. The cultural record is silent. Or sparse. The fish exists outside the traditional narrative. It belongs to the margins. The mud. The rock. The dark. That is the southern bastard cod. A southern cod with an unfortunate name. Doing its thing in the South Island harbours. Mostly ignored. Probably fine. The probably does a lot of work in that sentence. The uncertainty is formalised. The status is assumed. Not confirmed. The fish persists. In the shadows. Under the piles. In the caves. It waits. It watches. It feeds. And it carries on.