A method for constructing a habitat for Schizothorax brevicaurus

Abstract

The present invention provides a method for constructing a habitat for short-bearded schizothorax, which includes transforming the bottom in a natural river, selecting an area with a water flow velocity of 0.1-1.5 m / s, a water transparency of 35-50 cm, a water temperature of 18-25 ° C, and a water depth of 0.7-1.0 m, and laying fine sand and / or fine pebbles in the river section; the diameter of the fine sand is <10 mm, and the diameter of the fine pebbles is 20-50 mm. The habitat constructed by the method of the present invention can effectively lure short-bearded schizothorax to inhabit, and the inhabiting rate is high. The method is extremely simple, easy to operate, and low in cost.

Description

Technical Field

[0001] The invention relates to the technical field of habitat construction, and in particular to a method for constructing a habitat for schizothorax brevicaurus. Background Art

[0002] Schizothorax wangchiachii is also known as fine-shelled turtle, Burmese fish, and sand belly. It belongs to the order Cypriniformes, family Cyprinidae, subfamily Schizothorinae, and genus Schizothorax. It is mainly distributed in the Jinsha River, Dadu River, Wujiang River and other water systems with fast currents in the upper reaches of the Yangtze River in my country. The upper reaches of the Yangtze River are 1,030 km long. Its winding river channel, rocky bottom, turbulent water flow, and complex and diverse flow patterns have created a diverse fish fauna in the upper reaches of the Yangtze River. In recent years, human activities (hydropower development, river diversion, and overfishing) have had an adverse impact on the water ecological environment in the upper reaches of the Yangtze River, seriously threatening the fish habitat. Schizothorax wangchiachii is a very important economic fish in the Yangtze River and is listed as a "near threatened" species in the Red List of the World Conservation Union (IUCN). Schizothorax fish are of great significance to the biological and habitat diversity of the upper reaches of the Yangtze River. In recent years, the resources of short-bearded schizothorax have shown a declining trend, so research on short-bearded schizothorax is particularly important.

[0003] The destruction of habitats seriously affects the growth, development and reproduction of organisms. Different species and species at different growth stages have different preferences for habitats. At present, there are few studies on the construction of habitats for short-bearded schizothorax, and related research needs to be further deepened. Some scholars have reported the selectivity of short-bearded schizothorax larvae and juveniles for substrate, but no in-depth research has been conducted on how to construct short-bearded schizothorax habitats to improve their selection preferences. Summary of the invention

[0004] In view of the deficiencies in the prior art, an object of the present invention is to provide a method for constructing a habitat for Schizothorax brevicaurus.

[0005] The technical solution of the present invention is as follows:

[0006] A method for constructing a habitat for a short-bearded schizothorax, comprising:

[0007] The bottom of a natural river is transformed by selecting an area with a flow rate of 0.1-1.5 m / s, a water transparency of 35-50 cm, a water temperature of 18-25°C, and a water depth of 0.7-1.0 m, and laying fine sand and / or fine pebbles in the river section; the diameter of the fine sand is <10 mm, and the diameter of the fine pebbles is 20-50 mm.

[0008] The choice of habitat for aquatic organisms is a combination of multiple factors, which will be affected by factors such as water flow velocity, temperature, turbidity, etc. After long-term observation and research, the present invention found that the living mirror constructed under the above conditions of water flow velocity, water quality transparency, water temperature, water depth, etc. can effectively improve the habitat rate of short-bearded schizothorax.

[0009] Preferably, the thickness of the fine sand is 10 to 30 cm, and the thickness of the fine pebbles is 10 to 30 cm.

[0010] Preferably, the volume ratio of fine sand to fine pebbles is 1 to 2:1.

[0011] Preferably, before paving the river section, the fine sand and fine pebbles are soaked in the expansion bridge bend algae liquid.

[0012] Preferably, the algae density of the expanded bridge algae liquid is at least 4×10 6 cells / mL.

[0013] Preferably, the soaking time is at least 2 days.

[0014] Compared with the prior art, the beneficial results of the present invention are:

[0015] The present invention proposes a method for constructing a habitat for short-bearded schizothorax, which comprises modifying the bottom of a natural river, selecting a water flow environment with a flow rate of 0.1-1.5 m / s, a water transparency of 35-50 cm, a water temperature of 18-25°C, and a water depth of 0.7-1.0 m, and laying fine sand and / or fine pebbles of a specific particle size in the river section. The habitat constructed by the method of the present invention can effectively lure short-bearded schizothorax to inhabit, and has a high inhabitation rate.

[0016] The habitat construction method proposed by the invention is extremely simple, easy to operate and low in cost.

[0017] Further research showed that soaking fine sand and pebbles in the expansion bridge kelp liquid for at least 2 days and then using them in habitat construction can significantly improve the selection preference of short-bearded schizothorax. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 Schematic diagram of the bottom selection tank for short-bearded schizothorax (a) Schematic diagram; (b) Top view of the tank DETAILED DESCRIPTION

[0019] In order to enable those skilled in the art to better understand the technical content of the present invention, the present invention is further described below in conjunction with specific embodiments and drawings.

[0020] Test example:

[0021] 1 Materials and methods

[0022] 1.1 Experimental setup

[0023] The experimental device consists of two parts: Figure 1 ), respectively, the water tank device and the monitoring and recording device. An aerator is placed in the water tank to maintain the fish's need for oxygen. The water tank has a radius of 1m and a height of 0.6m. There is a water inlet within a radius of 0.2m from the center of the water tank and a water outlet on the side. The water circulation during the experiment is created by a water pump, and the water temperature is controlled at 19-20℃ by a temperature control system. In order to explore the choice of short-bearded schizothorax for different substrates, six different substrates were selected for the experiment, including fine sand (diameter <10mm), fine pebbles (diameter 20-50mm), mixed (including the other five substrates, equal volume mixed), medium pebbles (diameter 50-80mm), coarse pebbles (diameter 80-100mm), and boulders (diameter 100-150mm).

[0024] 1.2 Experimental methods

[0025] The experiment was conducted outdoors from 00:00 to 24:00 all day for one week. Ten short-bearded schizothorax were randomly selected and placed in a tank. Two parallel groups were set up and the experiment was carried out at the same time. After the experimental fish adapted for 1 hour, a digital camera was turned on to record the number of fish staying on different substrates every 20 minutes to compare the preferences of short-bearded schizothorax for different substrates.

[0026] 1.3 Data processing

[0027] The visit frequency of different substrate types was recorded within 24 hours, and the visit frequency percentage of different substrates observed in 7 days was used as an indicator of the selectivity of short-bearded schizothorax for different substrates. Non-parametric statistics (Kruskal Wallis Test) were used to test the percentage of the number of different substrates throughout the day. All tests were performed using spss28.0.0.0 statistical software. Statistical values ​​were expressed as mean ± standard deviation (Mean ± SD), P < 0.05 indicated a significant difference, and P < 0.01 indicated an extremely significant difference.

[0028] 2 Results and analysis

[0029] The selection of the six substrates by the multi-tailed short-bearded schizothorax was significant (P<0.05), and there was a significant difference between fine sand, fine pebbles and the other four substrates (P<0.05), and there was no significant difference between the other four substrates (P<0.05). The distribution percentage of the multi-tailed short-bearded schizothorax in fine sand reached more than 40%, the distribution percentage in fine pebbles reached more than 20%, and the distribution percentage in other substrates was less than 10%.

[0030] Habitat design for Schizothorax brevis was conducted based on the results of the bottom selection experiment. The habitat design methods include the following cases:

[0031] Example 1 A method for constructing a habitat for short-bearded schizothorax

[0032] The bottom of a natural river is transformed, with a water velocity of 0.1-1.5 m / s (preferably 1-1.5 m / s in this case), a water transparency of 35-50 cm, a water temperature of 18-25 °C, and a water depth of 0.7-1.0 m. Fine sand is laid in the river section, the diameter of the fine sand is <10 mm. The thickness of the fine sand is about 20 cm, and the laying area is 10 m 2 .

[0033] One week after the habitat was constructed, 20 healthy short-bearded schizothorax with a body length range of 20-40 cm were introduced into the habitat. The percentage of short-bearded schizothorax in the habitat throughout the day was tested according to the method of the above experimental example. After 5 parallel experiments, the percentage of short-bearded schizothorax in the habitat was 42-46%.

[0034] Example 2 A method for constructing a habitat for short-bearded schizothorax

[0035] The bottom of a natural river is transformed, with a flow rate of 0.1-1.5 m / s (preferably 1-1.5 m / s in this case), a water transparency of 35-50 cm, a water temperature of 18-25 °C, and a water depth of 0.7-1.0 m. Fine pebbles are laid in the river section, with a diameter of 20-50 mm. The thickness of the pebbles is about 20 cm, and the paving area is 10 m 2 .

[0036] One week after the habitat was constructed, 20 healthy short-bearded schizothorax with a body length range of 20-40 cm were introduced into the habitat. The percentage of short-bearded schizothorax in the habitat throughout the day was tested according to the method of the above experimental example. After 5 parallel experiments, the percentage of short-bearded schizothorax in the habitat was 22-25%.

[0037] Example 3 A method for constructing a habitat for short-bearded schizothorax

[0038] The bottom of a natural river is transformed, with a water velocity of 0.1-1.5 m / s (preferably 1-1.5 m / s in this example), a water transparency of 35-50 cm, a water temperature of 18-25 ° C, and a water depth of 0.7-1.0 m. Equal volumes of fine sand and fine pebbles are laid in the river section, the diameter of the fine sand is <10 mm, and the diameter of the fine pebbles is 20-50 mm. The laying thickness of the fine sand and fine pebbles is about 20 cm.

[0039] One week after the habitat was constructed, 20 healthy short-bearded schizothorax with a body length range of 20-40 cm were introduced into the habitat. The percentage of short-bearded schizothorax in the habitat throughout the day was tested according to the method of the above experimental example. After 5 parallel experiments, the percentage of short-bearded schizothorax in the habitat was 45-48%.

[0040] Example 4 A method for constructing a habitat for short-bearded schizothorax

[0041] The bottom of a natural river is transformed, with a water velocity of 0.1-1.5 m / s (preferably 1-1.5 m / s in this case), a water transparency of 35-50 cm, a water temperature of 18-25 °C, and a water depth of 0.7-1.0 m. Medium pebbles are laid in the river section, with a diameter of 50-80 mm. The thickness of the pebbles is about 20 cm, and the paving area is 10 m 2 .

[0042] One week after the habitat was constructed, 20 healthy short-bearded schizothorax with a body length range of 20-40 cm were introduced into the habitat. The percentage of short-bearded schizothorax in the habitat throughout the day was tested according to the method of the above experimental example. After 5 parallel experiments, the percentage of short-bearded schizothorax in the habitat was 7-9%.

[0043] Example 5 A method for constructing a habitat for short-bearded schizothorax

[0044] The bottom of a natural river was modified with a flow velocity of 0.1-1.5 m / s (the preferred flow velocity in this case was 1-1.5 m / s), a water transparency of 35-50 cm, a water temperature of 18-25 °C, and a water depth of 0.7-1.0 m. An equal volume of fine sand and fine pebbles was soaked in a solution with a density of 4.2×10 6 cells / mL of Cymbella tumida solution, soaked for 2 days, and then paved with fine sand and fine pebbles in the river section. The diameter of the fine sand is less than 10mm, and the diameter of the fine pebbles is 20-50mm. The paving thickness of the fine sand and fine pebbles is about 20cm, and the paving area is 10m 2 .

[0045] One week after the habitat was constructed, 20 healthy short-bearded schizothorax with a body length range of 20-40 cm were introduced into the habitat. The percentage of short-bearded schizothorax in the habitat throughout the day was tested according to the method of the above experimental example. After 5 parallel experiments, the distribution percentage of short-bearded schizothorax in the habitat was 62-67%.

[0046] Example 6 A method for constructing a habitat for short-bearded schizothorax

[0047] The bottom of a natural river was modified with a flow rate of 0.1-1.5 m / s (the preferred flow rate in this case was 1-1.5 m / s), a water transparency of 35-50 cm, a water temperature of 18-25 °C, and a water depth of 0.7-1.0 m. Fine sand and fine pebbles in a volume ratio of 2:1 were soaked in a solution with a density of 4.2×10 6 cells / mL of Cymbella tumida solution, soaked for 2 days, and then paved with fine sand and fine pebbles in the river section. The diameter of the fine sand is less than 10mm, and the diameter of the fine pebbles is 20-50mm. The paving thickness of the fine sand and fine pebbles is about 20cm, and the paving area is 10m 2 .

[0048] One week after the habitat was constructed, 20 healthy short-bearded schizothorax with a body length range of 20-40 cm were introduced into the habitat. The percentage of short-bearded schizothorax in the habitat throughout the day was tested according to the method of the above experimental example. After 5 parallel experiments, the percentage of short-bearded schizothorax in the habitat was 65-70%.

[0049] Example 7 A method for constructing a habitat for short-bearded schizothorax

[0050] The bottom of a natural river was modified with a flow velocity of 0.1-1.5 m / s (the preferred flow velocity in this case was 1-1.5 m / s), a water transparency of 35-50 cm, a water temperature of 18-25 °C, and a water depth of 0.7-1.0 m. An equal volume of fine sand and fine pebbles was soaked in a solution with a density of 4.2×10 6 cells / mL of simple boat-shaped algae (Navicula simplex), soaked for 2 days, and then paved with fine sand and fine pebbles in the river section. The diameter of the fine sand is less than 10mm, and the diameter of the fine pebbles is 20-50mm. The paving thickness of the fine sand and fine pebbles is about 20cm, and the paving area is 10m 2 .

[0051] One week after the habitat was constructed, 20 healthy short-bearded schizothorax with a body length range of 20-40 cm were introduced into the habitat. The percentage of short-bearded schizothorax in the habitat throughout the day was tested according to the method of the above experimental example. After 5 parallel experiments, the percentage of short-bearded schizothorax in the habitat was 46-50%.

[0052] The above descriptions are only some embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for constructing a habitat for a short-bearded schizothorax, characterized in that: include: To transform the bottom of a natural river, select an area with a flow rate of 0.1-1.5 m / s, a water transparency of 35-50 cm, a water temperature of 18-25 ° C, and a water depth of 0.7-1.0 m, and lay fine sand and fine pebbles in the river section; the diameter of the fine sand is less than 10 mm, and the diameter of the fine pebbles is 20-50 mm; The volume ratio of fine sand to fine pebbles is 1 to 2:1; Before laying the river section, the fine sand and fine pebbles are soaked in the expansion bridge bend algae liquid for at least 2 days, and the algae density of the expansion bridge bend algae liquid is at least 4×10 6 cells / mL.

2. The method for constructing a habitat for Schizothorax brevis according to claim 1, characterized in that: The thickness of fine sand is 10 to 30 cm, and the thickness of fine pebbles is 10 to 30 cm.

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