It's also possible that there is an old man. An old man could be a character who has a lot of knowledge about trout, like where to find them, their behavior, etc. He could be a mentor - like figure to the younger characters in the story, teaching them about the trout and the importance of nature.
I'm not sure specifically as I haven't read this exact story, but it could be a fisherman. A fisherman is a common character in stories related to trout, as they often interact with the trout.
Chapter 530, "I Only Drink 80 Degree Tea!", is the clearest early answer because it turns Degree Tea's situation into a concrete plot event. A useful checkpoint is the way the scene starts with Old Sir Gu took a step back, his expression cold and guarded as he...
Chapter 165, "Boom! Jiang Yan is actually Su Yinwan's fanboy?!", is the clearest early answer because it turns Brother Liu's situation into a concrete plot event. A useful checkpoint is the way the scene starts with How come everyone else got a solid six points, and he ended up with...
Chapter 508, "Isn't this the wild boar raised by Jiang Li?!", is the clearest early answer because it turns Captain's situation into a concrete plot event. A useful checkpoint is the way the scene starts with A chill wind suddenly arose, and the team members of Team D hiding in...
Chapter 356, "I announce, Lili is the best of the night!", is the clearest early answer because it turns Jiang Yan's situation into a concrete plot event. Early on, Seeing such a bustling scene, Su Yinwan who had just alighted from....
Chapter 350, "The Male Lead Actually Came Out to Clear Jiang Li's Name?!", is the clearest early answer because it turns Jiang Li's situation into a concrete plot event. It opens with The criticism on Weibo continued to ferment.
Chapter 283, "You Will Never Understand the Importance of Family!", is the clearest early answer because it turns Shen Lan's situation into a concrete plot event. It opens with Shen Lan furrowed her brows as Jiang Shixu suddenly appeared before...
Chapter 527, "Shaojing Bro, I'm Sorry", is the clearest early answer because it turns Jiang Cheng's situation into a concrete plot event. Early on, Jiang Li, taking advantage of these people's inattention, had already....
Chapter 389, "Slaughter Pig Platter", is the clearest early answer because it turns Xu Huiqiu's situation into a concrete plot event. It opens with Jiang Li gave Xu Huiqiu a meaningful look and finally voiced the... and closes on Identities can be fabricated," Jiang Li said lightly..
Chapter 537, "Ding, Jiang Cheng's affinity drops by 10 points!", is the clearest early answer because it turns Weibo's situation into a concrete plot event. The chapter turns that into something concrete by moving from Miss Su Yinwan immediately hung her head in dejection.
Chapter 377, "Master Above, Please Accept Your Disciple's Bow", is the clearest early answer because a shaky connection becomes usable in the plot. A useful checkpoint is the way the scene starts with Tell me what it is that you came to ask of me this time?" After...