Gish Biomedical Inc. said Wednesday that it expects to report record net earnings on sharply improved revenues for the fiscal quarter and year ended June 30. The Santa Ana manufacturer of surgical lasers and disposable medical products said revenues during the year are estimated to have risen 29% to $7.2 million from $5.6 million. For the fiscal fourth quarter, Gish estimated that revenues will total approximately $2.2 million, up 38% compared to $1.6 million. Last year, Gish reported that net earnings fell 61% to $94,000 from $246,000 in 1984. Actual 1986 revenues and earnings are expected to be released in four weeks, the company said.