A friend and I use the all planets lite mod pack, which added this planet to our save.

Sadly we aren't able to go to the planet because we are unable to research the prerequisite science fish breeding. The fish breeding science has no prerequisites anymore so we are unable to research it at all. Which in turn means we are not able to access Pelagos.

Can you fix this please, would love explore the planet.
Thanks

I am guessing that you are using some kind of mod that removes fish breeding technology. I need to know what mod causes this to happen to replicate issue and then try fix it.

What data do you need? The modlist or is a copy of the savefile easier?

more of modlist if you don't know what mod could cause that

Text from the json file

{
"mods":
[

{
  "name": "base",
  "enabled": true
},

{
  "name": "elevated-rails",
  "enabled": true
},

{
  "name": "quality",
  "enabled": true
},

{
  "name": "space-age",
  "enabled": true
},

{
  "name": "aai-containers",
  "enabled": true
},

{
  "name": "Accumulator-V2",
  "enabled": true
},

{
  "name": "alien-biomes-graphics",
  "enabled": true
},

{
  "name": "ArmouredBiters",
  "enabled": true
},

{
  "name": "astroponics",
  "enabled": true
},

{
  "name": "Better_Starmap_Background",
  "enabled": true
},

{
  "name": "bioprocessing-tab",
  "enabled": true
},

{
  "name": "bobinserters",
  "enabled": true
},

{
  "name": "boblibrary",
  "enabled": true
},

{
  "name": "boblogistics",
  "enabled": true
},

{
  "name": "bplib",
  "enabled": true
},

{
  "name": "canal-excavator",
  "enabled": true
},

{
  "name": "canal-excavator-graphics",
  "enabled": true
},

{
  "name": "cargo-ships",
  "enabled": true
},

{
  "name": "cargo-ships-graphics",
  "enabled": true
},

{
  "name": "castra",
  "enabled": true
},

{
  "name": "celestial-weather",
  "enabled": true
},

{
  "name": "cerys-lunaponics",
  "enabled": true
},

{
  "name": "Cerys-Moon-of-Fulgora",
  "enabled": true,
  "version": "4.8.2"
},

{
  "name": "Cold_biters",
  "enabled": true
},

{
  "name": "colorful_biochamber",
  "enabled": true
},

{
  "name": "common-prototypes",
  "enabled": true
},

{
  "name": "common-prototypes-graphics",
  "enabled": true
},

{
  "name": "corrundum",
  "enabled": true
},

{
  "name": "cubium",
  "enabled": true
},

{
  "name": "dea-dia-system",
  "enabled": true
},

{
  "name": "elevated-pipes",
  "enabled": true
},

{
  "name": "enhanced-shadows",
  "enabled": true
},

{
  "name": "est-tiny-storage-tank",
  "enabled": true
},

{
  "name": "even-distribution",
  "enabled": true
},

{
  "name": "Factorio-Tiberium",
  "enabled": true
},

{
  "name": "factorissimo-2-notnotmelon",
  "enabled": true
},

{
  "name": "FactorySearch",
  "enabled": true
},

{
  "name": "fdsl",
  "enabled": true
},

{
  "name": "Flare Stack",
  "enabled": true
},

{
  "name": "flib",
  "enabled": true
},

{
  "name": "FluidMustFlow",
  "enabled": true
},

{
  "name": "FrozenFood",
  "enabled": true
},

{
  "name": "FusionPoweredRobots",
  "enabled": true
},

{
  "name": "Igrys",
  "enabled": true
},

{
  "name": "janus",
  "enabled": true
},

{
  "name": "KrastorioAirPurifier",
  "enabled": true
},

{
  "name": "kry-planet-mods-lite",
  "enabled": true
},

{
  "name": "kry_stdlib",
  "enabled": true
},

{
  "name": "lex-aircraft",
  "enabled": true
},

{
  "name": "Long_Range_Delivery_Drones",
  "enabled": true
},

{
  "name": "long_stack_inserter",
  "enabled": true
},

{
  "name": "machine-upgrades",
  "enabled": true
},

{
  "name": "maraxsis",
  "enabled": true
},

{
  "name": "metal-and-stars",
  "enabled": true
},

{
  "name": "metal-and-stars-graphics",
  "enabled": true
},

{
  "name": "metal-and-stars-graphics-2",
  "enabled": true
},

{
  "name": "minimalist-rails",
  "enabled": true
},

{
  "name": "Moshine",
  "enabled": true
},

{
  "name": "Moshine-assets",
  "enabled": true
},

{
  "name": "muluna-graphics",
  "enabled": true
},

{
  "name": "muluna-utility-constants",
  "enabled": true
},

{
  "name": "naufulglebunusilo",
  "enabled": true
},

{
  "name": "new-diagonal-inserter",
  "enabled": true
},

{
  "name": "Nexus",
  "enabled": true
},

{
  "name": "Paracelsin",
  "enabled": true
},

{
  "name": "Paracelsin-Graphics",
  "enabled": true
},

{
  "name": "pelagos",
  "enabled": true
},

{
  "name": "pirateship",
  "enabled": true
},

{
  "name": "planet-muluna",
  "enabled": true
},

{
  "name": "PlanetsLib",
  "enabled": true
},

{
  "name": "PlanetsLibTiers",
  "enabled": true
},

{
  "name": "plasma-duct",
  "enabled": true
},

{
  "name": "quality_glassware",
  "enabled": true
},

{
  "name": "RateCalculator",
  "enabled": true
},

{
  "name": "Redrawn-Space-Connections",
  "enabled": false
},

{
  "name": "Robocharger-Updated",
  "enabled": true
},

{
  "name": "RocketCargoInsertion",
  "enabled": true
},

{
  "name": "rubia",
  "enabled": true
},

{
  "name": "rubia-assets",
  "enabled": true
},

{
  "name": "se-space-trains",
  "enabled": true
},

{
  "name": "secretas",
  "enabled": true
},

{
  "name": "shchierbin",
  "enabled": true
},

{
  "name": "skewer_planet_vesta",
  "enabled": true
},

{
  "name": "skewer_planet_vesta_assets",
  "enabled": true
},

{
  "name": "skewer_shattered_planet",
  "enabled": true
},

{
  "name": "skewer_shattered_planet_assets",
  "enabled": true
},

{
  "name": "slp-dyson-sphere-reworked",
  "enabled": true
},

{
  "name": "snouz-big-accumulator",
  "enabled": true
},

{
  "name": "snouz-big-solar-panel",
  "enabled": true
},

{
  "name": "snouz_better_substation",
  "enabled": true
},

{
  "name": "SolarMatrix",
  "enabled": true
},

{
  "name": "space-exploration-graphics",
  "enabled": true
},

{
  "name": "space-exploration-graphics-4",
  "enabled": true
},

{
  "name": "SpidertronEnhancements",
  "enabled": true
},

{
  "name": "SpidertronPatrols",
  "enabled": true
},

{
  "name": "squeak-through-2",
  "enabled": true
},

{
  "name": "tile-upgrade-planner-muluna",
  "enabled": true
},

{
  "name": "Todo-List",
  "enabled": true
},

{
  "name": "visible-planets",
  "enabled": true
},

{
  "name": "Warehousing",
  "enabled": true
}

]
}

that's a lot of stuff
i will try to find which mod is the one that remove tech

save file could work better in that case
dm me on discord.
you can find me on mod showcase channel on factorio discord

I was unable to reproduce it
Fish breeding is locked behind tree seeding
some mods remove tree seeding and that makes researching fish breeding impossible
Save file was probably a bit corrupted because tree seeding tech was missing
i made this mod to fix this issue:
https://mods.factorio.com/mod/fish-breeding-require-only-agriculture-science
it changes fish breeding prerequisite to be only agriculture science