Talk:Deep-sea fish

message: I'm suggesting a list of deep sea fish we have significant information about be added to the article as examples. I'm fascinated by the topic and the mystery of the various species but the article is somewhat of a dead end and doesnt offer many specific species to give an idea of what species we have documented and which are still just a distant mystery.Cold polymer 03:41, 4 August 1987 (UTC)
thread_title: List of Deep Sea Fish

message: This article reads like it was written by a 12-year old for 8-year olds. Please don't patronise me with  - I will try to, later. Just mentioning this for now in case someone wishes to work on it in the interim. 121.220.207.49 (talk) 14:40, 27 April 2008 (UTC)
thread_title:  Tone 

message: I question the accuracy of the description of swim bladder function in section Mesopelagic fish. Unfortunately the reference used is paywalled so I can't fix it.
The article claims that the swim bladder is inflated to cause the fish to ascend and deflated to descend. Any deep water angler or scuba diver will realise that this is implausible. The swim bladder will expand as the pressure reduces during ascent, and if the fish does not get rid of the excess gas it will become dangerously buoyant, and also risk over-expansion barotrauma, which is the fate of many reef fish when caught and brought to the surface. It is extremely tricky to bring fish up without injury. I have done a bit of work collecting angelfish and they either have to be deflated with a hollow needle or decompressed over a few hours - I have a portable decompression chamber for this purpose, made from an old scuba cylinder. Back to the main point, Fish use their swim bladders to achieve neutral buoyancy, to reduce the energy required to maintain depth. If they deflated to descend, and then sank, the increasing pressure would compress the gas further, in a positive feedback loop, and they would sink faster the deeper they go. The reverse effect occurs on ascent. So they swim up to ascend and resorb to remain close to neutral to avoid injury, At mesopelagic depths this change in buoyancy per unit depth is relatively slow, but in shallow water it is rapid and can get out of control. The fish ends up swimming against the buoyancy to avoid losing depth control. A neutrally buoyant fish can swim upwards easily without needing additional buoyancy, and will gain additional buoyancy if it does not resorb the swim-bladder gas fast enough. Gas volume control may well be a limiting factor on the speed of controlled ascent and descent, rather than a contribution to ascent speed. Descent is less problematic, as the gas is compressed with depth increase, but this does no harm to the fish, except that it will continue to sink when it stops swimming, until it produces sufficient gas to re-inflate to neutral buoyancy. The smaller the swim bladder, the less gas must be shifted in and out during depth change. The physics is trivial, but the physiology is fascinating. There are a few papers on the mechanism out there somewhere. • • • Peter (Southwood) (talk): 19:36, 20 March 2017 (UTC)
thread_title:  Function of the swim bladder 

message: These two articles contain much of the same information, but the latter is much better referenced. Some information from the Deep sea creature article would be more appropriate for the Deep sea communities article, or the Deep sea article. DiverDave (talk) 12:43, 1 July 2021 (UTC)
replies: text: what abut deep sea animals that are not fish, ~nuetral Clone commando sev (talk) 00:55, 20 August 2021 (UTC)
thread_title:  Proposed merge of [[Deep sea creature]] into [[Deep sea fish]]