Many biologists (myself included) don't anthropomorphize animals because it's impossible to objectively quantify things like "culture". So, my opinion is that some fish change sex, and not their gender (because fish don't have genders, which are human social constructs).
Happy to be corrected if I'm off-base. I'm not an ichthyologist.
Yeah, it's generally between Science and Nature in terms of greatest publication prestige. Most scientists work their butts off to get their works published in either of those, only to get their work desk-rejected and ultimately published in "less prestigious", field-specific journals.
That's not to say the Science and Nature are the end all be all of scientific journals; there are many journals specific to each field that is also prestigious.