The folllowing sentence is an excerpt from the NHK easy article:

<https://www3.nhk.or.jp/news/easy/k10012832221000/k10012832221000.html>

I've provided the preceding clause for more context.

「ヨコヅナイワシ」は、他の魚に食べられることがなくて、駿河湾の深い海にいる魚などの関係の中で、一番上の魚だということもわかりました。

研究グループは「ヨコヅナイワシ」が深い海の底の近くをゆっくり泳いでいる所 **も** テレビに撮りました。

My understanding of も is that it is the non-logical reverse particle of は in
the sense that it also marks the topic of the sentence, and states that
whatever comments are made about the も topic are the same about the preceding
topic. But the preceding topic in the 2nd clause is 研究のグループ?

I translated the sentence as:

The research group also took video footage of the location where the Yokozuna
fish were swimming slowly, near the bottom of the deep sea.

This sentence sounds weird to me and I don't think I really grasp も (it's the
particle I struggle with the most). Any suggestions?
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particle-も
What is the function of も in this sentence?
Actually, 「ところ」in this context doesn't mean "place" as you translate it. It
means something to the effect of "matter" or "fact". [デジタル大辞泉（小学館）
gives](https://dictionary.goo.ne.jp/word/%E3%81%A8%E3%81%93%E3%82%8D/):

> 事柄。内容。こと。

To put it in English (borrowing from Jisho.org):

> thing; matter

And it is usually written in kana, not kanji, as seen in your source. I see in
your transcription you put it in kanji 「所」, but the original text actually
has「ところ」.

「も」tells us the thing mentioned was done in addition to something else. Set
back into context, the meaning of the sentence becomes clear. What did the
research group do besides shooting a video of the fish swimming? They caught
four of them.

If you look at the original, pre-simplified report, this part is actually
pretty unambiguous. (Just click on
the[「普通のニュースを読む」](https://www3.nhk.or.jp/news/html/20210125/k10012832221000.html)button
at the bottom)

> また、研究グループは、深海に設置したカメラで、1メートルを超える「ヨコヅナイワシ」が、海底付近をゆっくりと泳ぐ姿の撮影にも成功しています。

A translation of the simplified sentence runs something like this:

> [In addition to catching four of them] The research group also shot a video
> of ヨコヅナイワシ swimming slowly near the bottom of the deep sea.
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answer