A Preliminary Study On The Feeding And Habitat Characteristics Of The Short Octopus (Octopus Ocellatus)

The Octopus ocellatus,commonly known as "sitting octopus","fan octopus","eight belt",etc.,is mainly distributed in the western Pacific Ocean and the north and south coasts of my country.Octopus ocellatus has delicious meat and rich nutrition.At the same time,because of its short life history and rapid growth,it is one of the excellent artificial breeding and proliferation and release varieties.At present,there are many studies on the breeding technology and living habits of the Octopus ocellatus,but there are relatively few studies on the effect of light on the Octopus ocellatus.This paper mainly observes the Octopus ocellatus by setting the light intensity,and takes the sand burrowing,burrowing and feeding of the Octopus ocellatus as the main line to understand the sand burrowing or feeding rules of the s Octopus ocellatus,and the subsequent behavior,which provides new ideas for research,design and placement of artificial octopus reefs,and can also explore new ways for the resource restoration and sustainable utilization of Octopus ocellatus.The main results of this paper are as follows:1.By changing different light intensities,the number of Octopus ocellatus burrowing in sand,the number of times of burrowing,the time and length of burrowing in the sand were recorded.The results showed that in the three-day experiment,the sand burrowing rate,sand burrowing times and sand burrowing time were the highest under 1000 lx light conditions,which were 80%,35 times,and 81.83 h,respectively.There were significant differences(p<0.05)under the condition of 1000 lx compared with the natural light condition and the dark condition in the sand burial rate,the number of sand burrowing times and the sand burrowing time(p<0.05);but there was no difference between the natural light and the dark condition.significant difference.The Octopus ocellatus has a negative tendency to light,and the dark or low light intensity conditions have little effect on the Octopus ocellatus sand-burrowing.With the increase of light intensity,the Octopus ocellatus was more likely to burrow sand,and high light intensity had a significant effect on the sand-burrowing behavior of the Octopus ocellatus.2.By setting the light control variable and the number of Octopus ocellatus variables,the experiment observed the drilling preferences of the Octopus ocellatus,and recorded the drilling time of the Octopus ocellatus,the time for the Octopus ocellatus to enter and exit the hole,and the length of time spent in the hole.The results showed that in the three-day experiment,the number and time of drilling a Octopus ocellatus were the highest under 1000 lx light conditions,which were 10.56 times and 17.7h,respectively.The drilling rate,drilling times and drilling time of 8 Octopus ocellatus were also the highest under 1000 lx light conditions,which were 86.67%,16.89 times and 17.7h,respectively.There were significant differences(p<0.05)in the burrowing rate,drilling times and drilling time of Octopus ocellatus compared with natural light and dark conditions under 1000 lx conditions(p<0.05).significant difference.Illumination has an obvious positive relationship with the burrowing behavior of Octopus ocellatus.With the increase of light intensity,the drilling time and times will also increase.3.The experiment observed the feeding changes of the Octopus ocellatus in different environments by changing the light intensity and substrate,and observed the substrate and light intensity most suitable for the Octopus ocellatus to feed.The experiment found that the Octopus ocellatus is very sensitive to light and has negative phototaxis,and high-intensity light has a certain effect on the Octopus ocellatus.Among the three substrates,under the fixed light intensity,the average feeding rate of the Octopus ocellatus is the highest in the plastic bottom(without substrate),which are 9.6% under dark environment,7.7% under natural light,and 6.6% under 1000lx;Under different light intensity,among the fixed substrates,the average feeding rate of Octopus ocellatus in the darker environment was the highest at 7.3% for sandy bottom,8.9% for muddy bottom,and 9.6% for plastic bottom(without substrate).In this experiment,plastic bottom and low light intensity were more suitable for Octopus ocellatus feeding,but high light intensity and mud bottom sand bottom were not suitable.The Octopus ocellatus is more active under low light intensity,which is related to its own habit.