| PGR | Pulse Generated Run-off |
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| odd-year run | Population of fish that returns to spawning grounds in odd-numbered years. (09 Oct 1997) |
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| run | <marine biology> A group of fish migrating in a river (most often on a spawning migration) that may comprise one or many stocks. (17 Dec 1997) |
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| winter-run fish | <marine biology> Anadromous fish that return to fresh water in autumn or winter, migrate to spawning areas and then spawn in late winter or spring. (09 Oct 1997) |
| spring-run fish | <marine biology> Anadromous fish that return to fresh water in the spring, migrate to spawning areas and spawn during late summer or early autumn. (04 Mar 1998) |
| nuclear run off assay | <investigation, procedure> Technique for determining which genes are being actively transcribed at a given moment in an experiment by extracting nuclear material and allowing transcription to continue, then analysing the resulting RNAs. (18 Nov 1997) |
| summer-run fish | <marine biology> Anadromous fish that return to fresh water during June through September, migrate inland toward spawning areas, overwinter in the larger rivers, resume migration in early spring to natal springs and then spawn. (19 Jan 1998) |
| fall-run fish | <marine biology> Anadromous fish that return to fresh water in the fall and spawn during fall or early winter. (09 Oct 1997) |
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