Diet immersion time:: effects on growth, survival and feeding behaviour of juvenile southern rock lobster, Jasus edwardsii
Diet immersion time:: effects on growth, survival and feeding behaviour of juvenile southern rock lobster, Jasus edwardsii
复制标题
DOI：
10.1016/s0044-8486(02)00507-0
复制
发表时间：
2003-04-02
期刊：
影响因子：
4.5
通讯作者：
Johnston, D
中科院分区：
文献类型：
--
作者：
Tolomei, A;Crear, B;Johnston, D
在为期16周的生长试验期间，测定了配制的虾饲料的水浸时间对南方岩龙虾（Jasus edwardsii）幼虾的生长、存活、食物转化和甲壳颜色的影响。龙虾喂食五种饮食之一：预浸泡虾饮食（0.5，2，4和8小时）或非浸泡虾饮食（0小时）。尽管从饮食中的干物质，蛋白质，灰分和虾青素作为预浸泡的结果显着的损失，有没有影响的生长，生存，食物转化或甲壳colors.Feeding行为的少年J.爱德华氏使用甘氨酸，牛磺酸和甜菜碱，以前确定为强化学引诱剂，其他甲壳类动物进行了评估。对翅前理毛频率（AGF）的定量被确定为评估爱德华氏金龟子中化学引诱物检测的最佳方法。在10（-4）至10（-6）Mol l（-1）浓度的甘氨酸反应中观察到AGF的最高速率。AGF随后被用于评估虾饲料提取物和新鲜贻贝（Mytilus edulis）提取物的兴奋能力。进行两个单独的实验以确定水浸对虾饲料的兴奋能力（检测源（AGF）的能力）和吸引性（吸引源（觅食偏好）的能力）的影响，并与新鲜贻贝肉的兴奋能力（AGF）和吸引性进行比较。未浸泡虾饲料、浸泡虾饲料和新鲜贻贝提取物的兴奋能力相似。但未浸泡虾饲料的诱食率高于浸泡虾饲料和贻贝肉。龙虾是能够检测虾的饮食，无论长期暴露于水，但是，他们会选择性地走向“新鲜”，而不是“陈旧”的dietes.The结果的研究表明，从虾的饮食中的化学引诱剂和营养物质的损失，造成浸出，对J edwardsii的文化表现几乎没有影响。因此，即使一些龙虾有一个缓慢的喂养反应，并可能不饲料后几个小时被喂食，饲料分配只有一天一次不会影响文化的表现。然而，需要重新评估浸出对专门为爱德华氏梭子蟹开发的饲料性能的影响。(C)2003 Elsevier Science B.V保留所有权利。
The effect of water immersion time of a formulated shrimp diet on growth, survival, food conversion and carapace colour of juvenile southern rock lobster, Jasus edwardsii, was determined during a 16 week growth trial. Lobsters were fed one of five diets: pre-soaked shrimp diet (0.5, 2, 4 and 8 h) or non-soaked shrimp diet (0 h). Despite a significant loss in dry matter, protein, ash and astaxanthin from the diet as a result of pre-soaking, there was no effect on the growth, survival, food conversion or carapace colour of lobsters.Feeding behaviour of juvenile J. edwardsii was assessed using glycine, taurine and betaine, previously identified as strong chemoattractants to other crustaceans. Quantification of the antermular grooming frequency (AGF) was identified as the best method of assessing chemoattractant detection in J edwardsii. The highest rate of AGF was observed in response to glycine at concentrations of 10(-4) to 10(-6) Mol l(-1) . AGF was subsequently used to assess the excitatory capacity of shrimp diet extract and fresh mussel (Mytilus edulis) extract.Two separate experiments were performed to determine the influence of water immersion on the excitatory capacity (ability to detect the source-(AGF)) and the attractability (capacity to attract to the source-(foraging preference)) of the shrimp diet in comparison to that of fresh mussel flesh. The excitatory capacity of the non-soaked shrimp diet, soaked shrimp diet and fresh mussel extracts were similar. However, the attractability of the non-soaked shrimp diet was greater than soaked shrimp diet and mussel flesh. Lobsters are capable of detecting the shrimp diet regardless of prolonged exposure to water; however, they will selectively move towards a "fresh" rather than a "stale" diet.The results of this study show that the loss of chemoattractants and nutrients from a shrimp diet, caused by leaching, had little impact on the culture performance of J edwardsii. Thus, even though some lobsters have a slow feeding response and may not feed for several hours after being fed, the dispensation of feed only once per day will not impact on culture performance. However, the influence of leaching on the performance of diets specifically developed for J edwardsii will need to be re-assessed. (C) 2003 Elsevier Science B.V All rights reserved.