Effectiveness of marking by extracting dorsal fin spines of devil stinger Inimicus japonicus
2010
Ohta, K., National Research Inst. of Fisheries and Environment of Inland Sea, Imabari, Ehime (Japan) | Shima, Y. | Watanabe, K.
Young devil stinger Inimicus japonicus (60.7 mm in total length, TL) were individually marked by extracting the fourth, fifth, or the fourth, fifth, ninth, tenth and eleventh spines of the dorsal fin using tweezers and the effectiveness and period that individuals can be distinguished were investigated. As a result, it was confirmed that the extracted spines do not regenerate and could be readily distinguished from control (no fin marking) individuals until the end of the experiment (twenty-four months after marking). Mortality due to marking was not observed. The mean rate at which young (61.6 mm TL) could be marked by extracting the fourth and fifth dorsal fin spines was 298 individuals/hour/person. Advantages of the present new marking method for young fish (ca. 60 mm TL) is that it is cheap, easily done and suitable for long term marking.
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