The major population of the veined rapa whelk Rapana venosa(Valenciennes, 1846), which is an important fishery resource, is facing a large decline in China. We studied the effects of incubation temperature(16–34℃ at...The major population of the veined rapa whelk Rapana venosa(Valenciennes, 1846), which is an important fishery resource, is facing a large decline in China. We studied the effects of incubation temperature(16–34℃ at salinity 30) and salinity(5–45 at 25℃) on the incubation period and subsequent larval development. In the temperature experiment, the shortest incubation period was 12 days at 34℃, the lower temperature limit was 16℃, the longest mean shell length(1 193±17 μm) occurred at 25℃ and the highest survival rate 72.28%±5.62% was observed at 28℃. In the salinity experiment, the shortest incubation period was 15 days at 25. The salinity tolerance range was 15–40, the longest mean shell length(855±9 μm) and the highest survival rate 72.93%±4.85% were both observed at 35. This study demonstrated that, during the egg–mass stage, temperature and salinity regimes infl uence later growth and survival of larvae. These observations deepen our understanding of the ecology and conservation of natural populations of Rapana venosa.展开更多
Objective:To determine length-weight relationships,growth type and feeding behavior of the benthic predator Rapa whelk at the coast of Camburnu,south-eastern Black Sea.Methods:Rapa whelk was monthly collected by dredg...Objective:To determine length-weight relationships,growth type and feeding behavior of the benthic predator Rapa whelk at the coast of Camburnu,south-eastern Black Sea.Methods:Rapa whelk was monthly collected by dredge sampling on the south-eastern Black Sea at 20 m depth.The relationships between morphometric parameters of Rapa whelk were described by linear and exponential models.The allometric growth of each variable relative to shell length(SL)was calculated from the function Y=aSL^(b) or logY=loga_(+)blogSL.The functional regression b values were tested by t-test at the 0.05 significance level if it was significantly different from isometric growth.The total time spent on feeding either on mussel tissue or live mussels was recorded for each individual under controlled conditions in laboratory.Results:The length-weight relationships showed positive allometric growth and no inter-sex variability.Body size in the male population was significantly higher than in the individuals of the female.All characters in males and females showed a trend towards allometry rather than isometry.While the total time spent feeding increased with increasing prey size the total time that Rapana venosa spent feeding decreased with increasing Rapa whelk size.The total average feeding time needed by Rapa whelks was 160 min.But they took 310 min on live mussels in 27-28℃ in the laboratory conditions.Conclusions:Length and weight relationships,growth type,total time spent feeding of this species were explained in details for this region.It would be useful to sustainable management in the south-eastern Black Sea of Turkey.The results about the feeding behaviour of this species will contribute to the understanding of the role of this species within the ecosystem.展开更多
基金Supported by the National Key Technology Research and Development Program of China(Nos.2011BAD13B01,2011BAD45B01)the Chinese Academy of Science and Government Cooperation Program(No.Y12319101L)the National Marine Public Welfare Research Program of China(No.201305043)
文摘The major population of the veined rapa whelk Rapana venosa(Valenciennes, 1846), which is an important fishery resource, is facing a large decline in China. We studied the effects of incubation temperature(16–34℃ at salinity 30) and salinity(5–45 at 25℃) on the incubation period and subsequent larval development. In the temperature experiment, the shortest incubation period was 12 days at 34℃, the lower temperature limit was 16℃, the longest mean shell length(1 193±17 μm) occurred at 25℃ and the highest survival rate 72.28%±5.62% was observed at 28℃. In the salinity experiment, the shortest incubation period was 15 days at 25. The salinity tolerance range was 15–40, the longest mean shell length(855±9 μm) and the highest survival rate 72.93%±4.85% were both observed at 35. This study demonstrated that, during the egg–mass stage, temperature and salinity regimes infl uence later growth and survival of larvae. These observations deepen our understanding of the ecology and conservation of natural populations of Rapana venosa.
基金supported by the Karadeniz Technical University,Trabzon,Turkey.
文摘Objective:To determine length-weight relationships,growth type and feeding behavior of the benthic predator Rapa whelk at the coast of Camburnu,south-eastern Black Sea.Methods:Rapa whelk was monthly collected by dredge sampling on the south-eastern Black Sea at 20 m depth.The relationships between morphometric parameters of Rapa whelk were described by linear and exponential models.The allometric growth of each variable relative to shell length(SL)was calculated from the function Y=aSL^(b) or logY=loga_(+)blogSL.The functional regression b values were tested by t-test at the 0.05 significance level if it was significantly different from isometric growth.The total time spent on feeding either on mussel tissue or live mussels was recorded for each individual under controlled conditions in laboratory.Results:The length-weight relationships showed positive allometric growth and no inter-sex variability.Body size in the male population was significantly higher than in the individuals of the female.All characters in males and females showed a trend towards allometry rather than isometry.While the total time spent feeding increased with increasing prey size the total time that Rapana venosa spent feeding decreased with increasing Rapa whelk size.The total average feeding time needed by Rapa whelks was 160 min.But they took 310 min on live mussels in 27-28℃ in the laboratory conditions.Conclusions:Length and weight relationships,growth type,total time spent feeding of this species were explained in details for this region.It would be useful to sustainable management in the south-eastern Black Sea of Turkey.The results about the feeding behaviour of this species will contribute to the understanding of the role of this species within the ecosystem.
