<span style="font-family:Verdana;">Japanese mackerel (</span><i><i><span style="font-family:Verdana;">Scomber</span></i> <i><span style="font...<span style="font-family:Verdana;">Japanese mackerel (</span><i><i><span style="font-family:Verdana;">Scomber</span></i> <i><span style="font-family:Verdana;">japonicus</span></i><span style="font-family:Verdana;"></span></i><span style="font-family:Verdana;">) is one of the important economic species in the pelagic light seine fishery in China, but few studies have been reported on the age, growth and management recommendations of Japanese mackerel in the high seas of the northwest Pacific Ocean. In this study, we fitted expressions for the relationship between fork length and body weight of Japanese mackerel based on fork length and body weight data of Japanese mackerel in the high seas of the Northwest Pacific Ocean from 2018 to 2019, and calculated growth parameters and growth characteristics of Japanese mackerel von Bertalanffy growth equation by identifying otolith age data combined with the least squares method. The results showed that the relationship between fork length and body weight of Japanese mackerel in the open sea of the Northwest Pacific Ocean was W = 2.0 × 10</span><sup><span style="font-family:Verdana;">-6</span></sup><span style="font-family:Verdana;"> L</span><sup><span style="font-family:Verdana;">3.289</span></sup><span style="font-family:Verdana;"> (r = 0.9764, n = 2833);the growth parameters were L = 447.61</span><sub><span style="font-family:Verdana;">∞</span></sub><span style="font-family:Verdana;">, K = 0.264, t = -1.06</span><sub><span style="font-family:Verdana;"><span style="font-family:Verdana;"><span style="font-family:Verdana;">0</span></span></span><span style="font-family:Verdana;"><span style="font-family:Verdana;"><span style="font-family:Verdana;"></span></span></span></sub><span style="font-family:Verdana;">;the growth rate reached the maximum when the bodyweight growth rate was 122 g/yr, at which the inflection point age was 3 years old, the inflection point body weight was 310 g, and the inflection point length was 309 mm. We recommend 2 years of age start fishing wit展开更多
文摘<span style="font-family:Verdana;">Japanese mackerel (</span><i><i><span style="font-family:Verdana;">Scomber</span></i> <i><span style="font-family:Verdana;">japonicus</span></i><span style="font-family:Verdana;"></span></i><span style="font-family:Verdana;">) is one of the important economic species in the pelagic light seine fishery in China, but few studies have been reported on the age, growth and management recommendations of Japanese mackerel in the high seas of the northwest Pacific Ocean. In this study, we fitted expressions for the relationship between fork length and body weight of Japanese mackerel based on fork length and body weight data of Japanese mackerel in the high seas of the Northwest Pacific Ocean from 2018 to 2019, and calculated growth parameters and growth characteristics of Japanese mackerel von Bertalanffy growth equation by identifying otolith age data combined with the least squares method. The results showed that the relationship between fork length and body weight of Japanese mackerel in the open sea of the Northwest Pacific Ocean was W = 2.0 × 10</span><sup><span style="font-family:Verdana;">-6</span></sup><span style="font-family:Verdana;"> L</span><sup><span style="font-family:Verdana;">3.289</span></sup><span style="font-family:Verdana;"> (r = 0.9764, n = 2833);the growth parameters were L = 447.61</span><sub><span style="font-family:Verdana;">∞</span></sub><span style="font-family:Verdana;">, K = 0.264, t = -1.06</span><sub><span style="font-family:Verdana;"><span style="font-family:Verdana;"><span style="font-family:Verdana;">0</span></span></span><span style="font-family:Verdana;"><span style="font-family:Verdana;"><span style="font-family:Verdana;"></span></span></span></sub><span style="font-family:Verdana;">;the growth rate reached the maximum when the bodyweight growth rate was 122 g/yr, at which the inflection point age was 3 years old, the inflection point body weight was 310 g, and the inflection point length was 309 mm. We recommend 2 years of age start fishing wit
