Fishing is done in the Open World areas by means of specific Fishing Spears.
These spears may be purchased from Fisher Hai-luk in Cetus starting at 500 standing.
Some fish require specific spears in order to be caught in one hit, while others may be caught with more than one. In this guide, the best spear will always be listed first, but any listed spear should catch that fish in one hit.

While any fish may possibly come out within their respective windows it is highly recommended to use bait where applicable. Fish without listed baits are common enough and should not need any.
Baits have increasing costs the farther you go. Requiring resources from less rare fish. Most baits require Fish meat and Maprico. The meat comes from any fish, the fruit are from short tree-like bushes.

When Fishing for 'Fish with Specific Baits' it is recommended to find applicable hotspots; which are areas in which small ripples form on their own. These ripples will happen sporadically in a small area, and after some time will stop. They look like this:












As of U22.6.1 Bait, Dyes, and Pharoma are all thrown items and the effects apply to everyone in the squad.

*The mortus Lungfish may be found during the day, but is far more common at night

The Lake refers to the large body of water straight out of cetus

Ponds refer to any landlocked body of water aside from the lake There are some bodies of water too small or too shallow for fishing. As rule of thumb if you can wade through the center of the pond; it's too small. To test a Pond properly, Hold and aim a spear for a few seconds while standing nearby; A body of water that may be fished in will produce gurgling sounds and a low drum beat.

Ocean refers to the large bodies of water at the coasts far to the left or right coming out of Cetus.

I don't use fish for standing myself, but in the Standing:time ratio of all activities that earn you standing, Fishing would be the top (with certain criteria: Fishing at night with the most expensive bait).

These fish just aren't worth the effort if going for standing; use them for Oil/scales/Fish tank.

25 for small, 35 for medium, 50 for Large.

These Fish are better; but if you are low ranking; Mortis Lungfish are both Easy to accumulate in large numbers and worth a fair bit IN those large number. Simply fish Any pond at night, no bait required.

100 for small, 125 for medium, 200 for Large.

These fish are more difficult to come by, and require bait to get any decent number of them. You'll typically need their resources over any standing they earn.

500 for small, 625 for medium, 1000 for Large.

Nothing earns more than the Glappid. And since only the highest level Operator Arcanes use the resource you may find you can fish for these guys and earn a nice little stockpile of standing for days you don't have much time to grind out bounties. Just be warned the Bait isn't cheap and reserved for top rank.

1200 for small, 1500 for medium, 2000 for Large

The Orb Vallis presents us with a Shock spear for catching robotic fish without damaging them. Using plains spears will result in only "basic" or lowest level fish. The second tier Shockspear, The Stunna, will stun nearby robotic fish for about 20s and increase the size of the sweet-spot zone. The three tiers of fish are Basic<Adorned<Magnificent. Current testing shows no difference in where within the sweet spot on the fishing bar produces better results. The amount of standing earned when Providing these 'fish' to Fortuna is influenced by their rank, however there is little difference in parts obtained when dismantling them.

The Time of day in Orb Vallis is attributed to the temperature; Opening the advanced map (Hold M) will show a sort of clock in the bottom right showing warm or cold. Warm lasts 4 min, Cold lasts 22 min, so focusing on the warm fish when available is prudent. Caves are not affected by temperature (Time of day).

Hot Spots in the Orb Vallis look similar to Aurora Borealis with little shining vertical lights. The lighter area just above the reticle in the image below.











Cave hotspots are a little harder to identify with steam and other gasses floating about, Look for the vertical lights.












Orb Vallis brings us new baits as well; These Baits are single use purchase without crafting. Baits Will Not bring fish out if the Temp(time) is not right. They do, however, heavily increase the number of fish around for a short time.

The Orange outlines the Lake. The blue circles show caves with fishable water, Green denotes caves in which I have encountered Hotspots. The Red circle is a bugged cave, I found a hotspot in here but the fish spawn underneath the pond making them untouchable.



All fish can be caught without the use of bait, though Longwinder, Tromyzon, and Synathid are significantly uncommon.