Max Weber’s Pipefish
Cosmocampus maxweberi - Sunken yacht, Camiguin
Cosmocampus maxweberi - Karang Asem, Bali, Indonesia
Cosmocampus maxweberi - Karang Asem, Bali, Indonesia
© S. Bogorodsky
Fishes · Bony fishes · Pipefishes

Max Weber’s Pipefish

Cosmocampus maxweberi (Whitley, 1933)
syn. Syngnathus maxweberi
up to 10 cm0-36 mLeast Concern
691

Ten centimeters (4 in) of small pale pipefish lying among weed and rubble, and one of the animals in this catalogue about which almost nothing is known.

That is not unusual for the group. Pipefishes are small, still, cryptic and hard to identify - separating species often needs counts of the bony rings along the body and the tail - so the literature for many of them consists of a description, a few museum specimens and a distribution map. Behavior, diet and breeding are extrapolated from relatives.

It is named for Max Weber, the Dutch zoologist whose Siboga expedition of 1899 to 1900 hauled up much of what was then known about Indo-Pacific fishes, and whose name is attached to a good many species that other people described from his material.

What can be said: it lives in shallow rubble, eats small crustaceans through a pipette snout, and the male broods the eggs. Everything past that is inference.

The genus. Cosmocampus Dawson 1979 - kosmos (ornament or decoration) + kampos (mythological sea monster). ETYFish

How to recognise it
  • small pale pipefish with faint darker bars and a short snout
  • body rings distinctly ridged, giving a rough outline
  • usually lying still among weed and rubble
  • length up to 10 cm

Why it's threatened

Residential & commercial development
Housing & urban areas · Commercial & industrial areas · Tourism & recreation areas
Biological resource use
Unintentional effects: (subsistence/small scale) [harvest] · Unintentional effects: (large scale) [harvest]
Pollution
Sewage · Run-off · Nutrient loads · Soil erosion, sedimentation
Climate change & severe weather
Habitat shifting & alteration · Temperature extremes

Cosmocampus maxweberi is threatened by coral reef habitat loss. Reefs in the region declined by 1% per year for 20 years from 1984-2004 (Bruno and Selig 2007), and declines are ongoing (De'Ath et al. 2012). This decline in coral reefs is a result of many factors, including pollution and sedimentation from coastal development, destructive fishing practices such as dynamite fishing and bottom trawling, and the effects of climate change such as ocean acidification and rising sea temperatures (Bruno and Selig 2007, Carpenter et al. 2008). This coral decline is not thought to have occurred on a timescale that is relevant to three generations for this species, and C. mabxweberi can also use coral rubble as habitat.

The species may also be at risk directly due to collection for the aquarium trade (Krause 2011), but this has not been quantified and effects on wild populations are unclear.

Threat classification from the IUCN Red List.

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Last Update: August 15, 2026