<prompt> Translate the following text to EnglishKatika majaribio ya kemikali za bahari, LC50 moja tu yaelekea LC50 iliyounganishwa kutoka kwa vipimo vya mara mbili iliripotiwa kwa kila mtihani wa sumu.  <response>: In studies with the marine organisms, only one LC50 presumably the combined LC50 from duplicate tests was reported for each toxicity test. 