Migration and settlement of puerulus of spiny lobsters in southern hemisphere

小龙虾的幼虫在大约一年的时间里孵化为叶瘤，蜕变为葛根。由于实验室培养叶瘤体和海洋捕获葛根的困难，葛根特别是早期阶段的葛根一直是小龙虾生活史中缺失的一环。一些尤苏斯爱德华一世的葛根被观察到定居在城堡点，新西兰。另一种是在新西兰北部和澳大利亚新南威尔士州南部海岸发现的Jasus verreauxi。我们进行调查是为了了解小龙虾的迁徙和定居情况。黄杨葛根沉降的季节变化。1991年1月和2月，Booth型采集者采集的葛根和后葛根共198只，18天47只，采集者12人，11月和12月采集的葛根和后葛根共40只，10天13只，采集者20人。夏季葛根沉降量明显高于春季。分布…更多的葛根靠近海岸。退潮时，在沙滩上的石头下发现了许多葛根。2月份，在755颗结石下共收集了106颗褥子和13颗褥子后。用收集器在Castlepoint入口的中部深度处采集了一些葛根。用雪撬网在进水口沙底取样一株葛根。葛根肝胰脏的形态学改变。肝胰脏在葛根期早期不可见。在晚期，它变成了一对白色的器官。组织学观察发现，早期葛根肝胰脏前叶尖端有脂肪储存。中期后肝胰腺细胞中发现脂肪。葛根的挖洞行为。葛根在城堡角的咸沙上表现出挖洞的行为。早期葛根容易挖洞，晚期葛根和后葛根不能挖洞。葛uli白天在淤泥中钻洞，天黑后才出来。少

The larvae of spiny lobsters hatch out as phyllosoma and metamorphose into puerulus after about a year. Because od difficulties to culture phyllosomas in laboratory and to capture pueruli in the ocean, the puerulus particalarly at the early stage has been a missing link of the life history of spiny lobsters. A number of puerulus of Jasus edwardsii was observed to settle at Castlepoint, New Zealand. Another species Jasus verreauxi occurred in the northern part of New Zealand and southern coast of New South Wales, Australia. We have carried out the survey in order to find migration and settlement of puerulus of siny lobsters.1. Seasonal change of puerulus settlement for J. edwardsii. Total number of pueruli and postpueruli collected with Booth type collectors were 198 and 47 for 18 days with 12 collectors in January and February, and 40 and 13 for 10 days with 20 collectors in November and December 1991. Settlement of the puerulus was much higher in summer compared to spring.2. Distribut … More ion of the puerulus near shore. A number of puerulus was found under the stones on sand beach at low tide. A total of 106 pueruli and 13 postpueruli was collected under 755 stones in February. A number of puerulus was collected at the middle depth of the mouth part of Castlepoint Inlet with collectors. A puerulus was sampled with sledge net on the sandy bottom in the inlet.3. Morphological change of hepatopancreas of the puerulus. The hepatopancreas was not visible for the early stage of the puerulus. It became visible as a pair of white coloured organ at the advanced stage. From histological examination storage of fat was observed at the tip of anterior lobe of the hepatopancreas for the early stage puerulus. The fat was found in the cells of the hepatopancreas after the mid-stage.4. Burrowing behaviour of the puerulus. The puerulus showed the burrowing behaviour on the salty sand at Castlepoint. The early stage puerulus burrowed easily, but the late stage puerulus and postpuerulus could not burrow. The pueruli burrowed into silt at daytime and emerged after dark. Less