Question

すかい

4行目のonceの後に2語省略されているらしいのですが分かりません。教えてください🙏

[1 The world's oceans are being overfished and entire populations of fish are in
danger of disappearing forever. According tol the United Nations Food and
Agriculture Organization, 28% of fish stocks worldwide are nearing extinction,
and once extinct, they are lost forever. If current trends continue,
many
scientists
5 prediet that most of the larger higher-value fish will disappear completely from the
North Atlantic region within the next 30 years.