HONGKONG'S container port has recorded an 18.1 per cent rise to 1.91 million 20-foot equivalent units (TEUs) for the first three months of 1993, compared with 1.62 million in the same period last year. Over the same period, container throughput at Kwai Chung terminals rose 10.6 per cent to 1.18 million TEUs, compared with 1.07 million. Throughput in mid-stream and elsewhere rose 17.2 per cent from 520,051 TEUs to 609,639 TEUs while river trade rose 226 per cent from 38,257 TEUs to 124,735 TEUs. The mid-stream figures included 4,469 TEUs in 1992 and 310 TEUs in 1993 which were handled by terminal vessels contracted to work in the stream. Port Development Board (PDB) secretary Tony Clark said the statistics suggested that the port would grow by 20 per cent for the whole year. ''The pattern is becoming a bit more clear but the figures for April and May will give us a better idea of the growth trend,'' he said. The 10 per cent throughput growth at Kwai Chung port suggested that its berths were full, he added. Mr Clark said that when the construction of Terminal 8 was completed later this year, it would give the port an additional 400,000 to 450,000 TEUs and greatly assist existing terminal operators Modern Terminals and Hongkong International Terminals. Mr Clark said the percentage rise in the river trade figures could not reflect the true picture as the previous year's figures were not collected by the present method, which was introduced in April last year.