Reading a weight curve: what a plateau really means

A single weight tells you almost nothing. Two weights tell you a direction. Six months of weights on a fixed cadence tells you whether your husbandry is working.

Plateaus that are fine

• •Seasonal cycling. Many species eat less as day length and temperature drop, and mature males in particular can go off food during the breeding season and lose condition without anything being wrong.
• •Adult maintenance. A finished adult should plateau. Continued climb in an adult is usually a feeding-schedule problem, not a success.
• •Post-shed noise. Weigh at the same point in the cycle where you can; a fresh shed and a full gut both move the number.

Plateaus worth investigating

• •A growing animal flat for two or more months while still eating — check temperatures with your own probe, not the thermostat's display.
• •Weight falling while feeding continues — the classic prompt for a faecal check and a vet conversation.
• •Refusals clustering around a change you made: new enclosure, new substrate, moved rack position, different prey source.

Make the trend readable

Weigh on the same scale, at the same point in the feeding cycle, on a fixed cadence, and record it every single time — including the times the number is boring. Gaps are what make a curve unreadable, and the missing weeks are almost always the interesting ones.

Compare animals against themselves, not against a chart you found online. Growth rate varies enormously with feeding regime, temperature and genetics.