|Budget Amount *help
¥1,600,000 (Direct Cost : ¥1,600,000)
Fiscal Year 1994 : ¥800,000 (Direct Cost : ¥800,000)
Fiscal Year 1993 : ¥800,000 (Direct Cost : ¥800,000)
Cytogenetical study of lobster species of Crustaceans were examined. Six species of Panulirus japonicus, P.marginatus, P.homarus, P.longipes, Jasus edwardsii and J.lalandii collected from Japan (P.j.), Hawaii, U.S.A.(P.M.), Indonesia (P.m., P.l.), New Zealand (J.e.) and South Africa (J.l.) were used for the present study. Diploid chromosome numbers of these species were 2n=112 (P.j.), 118 (P.m.), 150 (P.h.), 110 (P.l.), 142 (J.e.) and 136 (J.l.), respectively. Karyo-types of these were 38M+16SM+18ST+42A (P.j.), 88M+14SM+16A (P.m.), 64M+20SM+34ST+32A (P.h.), 38M+16SM+8ST+48A (P.l.), 50M+36SM+4ST+52A (J.e.) and 100M+14ST+22A (J.l.).
Species specificities in the diploid chromosome numbers and the karyotypes of these six spiny lobster species were clearly identified. The diploid chromosome numbers in three species of Panulirus were in one-hundred and tenes but two species of Jasus were in one-hundred and thirties. The diploid chromosome number of P.homarus was showed large different with other species. First record of Ag-NOR's was found in the three arms on metacentric pairs of P.japonicus.
These cytogenetical fundamental characteristics of six lobster species seems to useful results for biological and fisheries researches for breeding and classification.
以上の研究成果は、2つの国際会議(Fourth International Workshop on Lobster(三陸町),Fifthth International Symposium Genetics in Aquaculture(Halifax,Canada))および2つに国内学会(平成6年度日本水産学会秋季大会(津市)、日本甲殻類学会第32回大会(福岡市)において、発表した。なお、これら知見については、近く関係学会誌に発表の予定である。