During my morning jog, I took a detour to watch the fish in the nearby river! I wonder what kind of fish they were?
ご質問ありがとうございます。
"During my morning job"=「朝のジョギング中に」
"I took a detour"=「寄り道をした」
"to watch the fish in the nearby river!"=「近所の川にいる魚を見るために!」
"I wonder what kind of fish they were?"=「どんな種類の魚だったのだろう?」
ご参考になると幸いです!