Labrids are one of the most common types of fish to occur in inshore rocky marine habitats in New Zealand. There are major discontinuities in their relative abundance in archaeological sites from different regions of New Zealand, and these are difficult to reconcile with known distributional patterns. A number of possible explanations are examined such as changes in fishing technology and various ecological factors. It is concluded that the reasons for these observed fluctuations may vary considerably from one case to another, but where large numbers were caught by prehistoric people who had access to alternative fish resources, unreliability of some major aspect of the economy may be inferred. A combination of poor sea conditions and marginal horticulture is likely to increase the importance of labrid fish. -- AATA