Fishing System - L2J Mobius Chronicle 4

Overview

The Fishing System is a non-combat activity that allows players to catch fish for crafting materials, consumables, and special rewards. The system features an interactive mini-game, fishing rod upgrades, lure types, and occasional Fishing Monsters that provide combat encounters.

Fishing requires specific equipment (rods and lures) and can only be performed in designated water zones throughout the game world.

Getting Started

Required Equipment

Fishing Rod: Different grades provide better catch rates
Fishing Lure: Consumed on each fishing attempt
Water Zone: Must be near fishable water

Fishing Rods

Managed by FishingRodsData.java:

import org.l2jmobius.gameserver.data.xml.FishingRodsData;

public class FishingRod {
    private final int itemId;
    private final int fishTimeMin;
    private final int fishTimeMax;
    private final int fishTimeRandom;
    private final double damage;
    // Additional properties
}

Rod Grades:

Novice Fishing Rod: Entry-level, slow catch times
Fishing Rod: Standard rod for mid-level fishing
Great Fishing Rod: Fast catch times, better fish
Ultra Fishing Rod: Best rod, rare fish access

Fishing Lures

Three tiers affecting fish quality:

Lure Type	Quality	Fish Grade	Cost
Regular Lure	Low	Common fish	Low
Good Lure	Medium	Uncommon fish	Medium
Best Lure	High	Rare fish	High

Lure Consumption:

1 lure consumed per fishing attempt
Lost on failure or success
Better lures = better fish but higher cost

Fishing Process

Starting to Fish

Equip fishing rod in weapon slot
Have lures in inventory
Stand near water zone
Use fishing skill/command

Waiting Phase

Random wait time based on rod quality:

// FishingRod properties
private final int fishTimeMin;      // Minimum wait (ms)
private final int fishTimeMax;      // Maximum wait (ms)  
private final int fishTimeRandom;   // Random variance

// Actual wait time calculation
int waitTime = fishTimeMin + Rnd.get(fishTimeRandom);

Hook Phase

When a fish bites:

System Message: “You’ve got a bite!”
Sound Effect: Fishing sound plays
Combat UI: Fishing combat interface appears

Source: Fishing.java:105-110

// Succeeded in getting a bite
_fisher.sendPacket(SystemMessageId.SUCCEEDED_IN_GETTING_A_BITE);
_fisher.broadcastPacket(new ExFishingStartCombat(
    _fisher, _time, _fishMaxHp, _mode, lureType, _deceptiveMode
));
_fisher.sendPacket(new PlaySound(1, "SF_S_01", 0, 0, 0, 0, 0));

Fishing Combat

Combat Mechanics

Fishing transforms into a mini-game:

public Fishing(Player fisher, Fish fish, boolean isNoob, boolean isUpperGrade) {
    _fisher = fisher;
    _fishMaxHp = fish.getFishHp();
    _fishCurHp = _fishMaxHp;
    _regenHp = fish.getHpRegen();
    _fishId = fish.getItemId();
    _time = fish.getCombatDuration();
    _isUpperGrade = isUpperGrade;
    
    final int lureType;
    if (isUpperGrade) {
        _deceptiveMode = (Rnd.get(100) >= 90) ? 1 : 0;
        lureType = 2;
    } else {
        _deceptiveMode = 0;
        lureType = isNoob ? 0 : 1;
    }
    
    _mode = (Rnd.get(100) >= 80) ? 1 : 0;
}

Source: Fishing.java:83-105

Fish Properties

Fish HP: Total “health” of the fish
HP Regeneration: Fish recovers HP over time
Combat Duration: Time limit to catch the fish
Mode: Changes fish behavior (0 = normal, 1 = aggressive)
Deceptive Mode: Upper-grade fish can fake their behavior

Player Actions

Pumping

Reduces fish HP based on timing and rod quality. Use when mode indicator shows correct state.

Reeling

Primary damage action. More effective when timed correctly.

public void useReeling(int dmg, int pen) {
    _anim = 2;
    if (Rnd.get(100) > 90) {
        _fisher.sendPacket(SystemMessageId.FISH_HAS_RESISTED);
        _goodUse = 0;
        changeHp(0, pen);
        return;
    }
    
    // Process successful reeling
}

Source: Fishing.java:236-250

Pumping (Alternative)

Secondary damage action. Used in combination with reeling for optimal results.

Combat Resolution

Victory Conditions:

if (_fishCurHp == 0) {
    doDie(true);  // Fish caught
}

Failure Conditions:

if (_fishCurHp >= (_fishMaxHp * 2)) {
    // The fish got away
    _fisher.sendPacket(SystemMessageId.THE_FISH_GOT_AWAY);
    doDie(false);
} else if (_time <= 0) {
    // Time is up
    _fisher.sendPacket(SystemMessageId.TIME_IS_UP_SO_THAT_FISH_GOT_AWAY);
    doDie(false);
}

Source: Fishing.java:65-76

HP Changes

public void changeHp(int hp, int pen) {
    _fishCurHp -= hp;
    if (_fishCurHp < 0) {
        _fishCurHp = 0;
    }
    
    _fisher.broadcastPacket(new ExFishingHpRegen(
        _fisher, _time, _fishCurHp, _mode, _goodUse, _anim, pen, _deceptiveMode
    ));
    _anim = 0;
    
    if (_fishCurHp > (_fishMaxHp * 2)) {
        _fishCurHp = _fishMaxHp * 2;
        doDie(false);
    } else if (_fishCurHp == 0) {
        doDie(true);
    }
}

Source: Fishing.java:117-136

Fishing Monsters

Occasionally, players hook Fishing Monsters instead of fish:

if (win) {
    final FishingMonster fishingMonster = FishingMonstersData.getInstance()
        .getFishingMonster(_fisher.getLevel());
    if (fishingMonster != null) {
        if (Rnd.get(100) <= fishingMonster.getProbability()) {
            _fisher.sendPacket(SystemMessageId.YOU_HAVE_CAUGHT_A_MONSTER);
            final Npc monster = Quest.addSpawn(
                fishingMonster.getFishingMonsterId(), _fisher
            );
            monster.setTarget(_fisher);
        } else {
            _fisher.sendPacket(SystemMessageId.SUCCEEDED_IN_FISHING);
            _fisher.addItem(ItemProcessType.PICKUP, _fishId, 1, null, true);
        }
    }
}

Source: Fishing.java:151-167

Fishing Monster Properties

public class FishingMonster {
    private final int level;              // Player level range
    private final int fishingMonsterId;   // NPC ID to spawn
    private final int probability;        // % chance (0-100)
}

Mechanics:

Spawn chance based on player level
Monster spawns near player position
Immediately aggros the fisher
Drops special loot on defeat

Managed by: FishingMonstersData.java

Fish Types and Rewards

Common Fish

Used in cooking recipes
Sold to NPCs for Adena
Required for fishing-related quests

Uncommon Fish

Better cooking ingredients
Higher NPC sell value
Some quest requirements

Rare Fish

Premium cooking materials
Craft special consumables
High market value
Trophy items

Special Rewards

Treasure chests (rare)
Crafting materials
Enchant scrolls (very rare)
Event-specific items

AI Task System

Fishing combat runs on a scheduled task:

private Future<?> _fishAiTask;
private boolean _thinking;

if (_fishAiTask == null) {
    _fishAiTask = ThreadPool.scheduleAtFixedRate(this, 1000, 1000);
}

protected void aiTask() {
    if (_thinking) return;
    
    _thinking = true;
    _time--;
    
    try {
        if (_mode == 1) {
            if (_deceptiveMode == 0) {
                _fishCurHp += (int) _regenHp;
            }
        } else if (_deceptiveMode == 1) {
            _fishCurHp += (int) _regenHp;
        }
        
        if (_stop == 0) {
            _stop = 1;
            int check = Rnd.get(100);
            if (check >= 70) {
                _mode = _mode == 0 ? 1 : 0;
            }
            
            if (_isUpperGrade) {
                check = Rnd.get(100);
                if (check >= 90) {
                    _deceptiveMode = _deceptiveMode == 0 ? 1 : 0;
                }
            }
        } else {
            _stop--;
        }
    } finally {
        _thinking = false;
        // Send HP update packet
    }
}

Source: Fishing.java:174-234

Mode Changes

70% chance every second to switch modes
Upper-grade fish have 10% chance to switch deceptive mode
Players must adapt to changing patterns

Fishing Zones

Fishable areas are designated by zone type:

Rivers and lakes
Ocean coastlines
Special fishing spots (better rewards)
Event-specific fishing zones

Zone Check:

if (!player.isInWaterZone()) {
    player.sendMessage("You must be near water to fish.");
    return;
}

Skill System

Fishing has associated skills:

Fishing (Skill): Basic fishing ability
Expert Fishing: Enhanced catch rates
Master Fishing: Access to best fishing spots

Skill Levels:

Level 1-10: Progressive improvements
Higher level = better fish, faster catches
Trained via NPC fishermen

Configuration

Fish Data

Stored in XML or database:

<fish id="1" itemId="6900" level="1-5" hp="100" hpRegen="5" combatTime="30" />
<fish id="2" itemId="6901" level="6-10" hp="150" hpRegen="8" combatTime="40" />

Fishing Rod Data

<rod itemId="6519" fishTimeMin="5000" fishTimeMax="15000" 
     fishTimeRandom="10000" damage="10" />

Monster Data

<fishingMonster level="20" monsterId="18319" probability="5" />
<fishingMonster level="40" monsterId="18320" probability="10" />

Strategy Tips

Beginner Fishers

Start with cheap lures to learn mechanics
Practice timing in low-level zones
Upgrade rod before spending on expensive lures

Advanced Fishers

Use best lures only with best rod
Learn mode patterns to maximize damage
Fish in special zones during events for bonuses

Profit Fishing

Focus on fish types in high demand
Sell rare fish on player market
Complete fishing quests for reputation

Monster Hunting

Come prepared for combat
Higher level = better monster drops
Party members can help with monster kills

Terminating Fishing

public synchronized void doDie(boolean win) {
    if (_fishAiTask != null) {
        _fishAiTask.cancel(false);
        _fishAiTask = null;
    }
    
    if (_fisher == null) return;
    
    if (win) {
        // Award fish or spawn monster
    }
    
    _fisher.endFishing(win);
    _fisher = null;
}

Source: Fishing.java:138-172

FAQ

Can I fish while in a party?

Yes, but each player fishes independently. Party members can help kill fishing monsters.

Do I lose my rod if I fail?

No, rods are permanent. Only lures are consumed.

Can I fish in PvP zones?

Yes, but you’re vulnerable to attack. Fishing is interrupted if you enter combat.

What's the best way to level fishing skill?

Consistent practice. Fish quantity matters more than quality for skill advancement.

Are fishing monsters difficult?

They scale to your level. Come prepared with potions and be ready to fight.

Clan System - Some clans organize fishing events
Seven Signs - Special fishing opportunities during events

References

Fishing.java - Core fishing combat system
FishingRodsData.java - Rod configurations
FishingMonstersData.java - Monster spawn data
FishingRod.java - Rod data structure
FishingMonster.java - Monster data structure

Get Started

Server Setup

Game Systems

Scripting

Administration

​Overview

​Getting Started

​Required Equipment

​Fishing Rods

​Fishing Lures

​Fishing Process

​Starting to Fish

​Waiting Phase

​Hook Phase

​Fishing Combat

​Combat Mechanics

​Fish Properties

​Player Actions

​Combat Resolution

​HP Changes

​Fishing Monsters

​Fishing Monster Properties

​Fish Types and Rewards

​Common Fish

​Uncommon Fish

​Rare Fish

​Special Rewards

​AI Task System

​Mode Changes

​Fishing Zones

​Skill System

​Configuration

​Fish Data

​Fishing Rod Data

​Monster Data

​Strategy Tips

​Terminating Fishing

​FAQ

​Related Systems

​References

Build docs developers (and LLMs) love

Overview

Getting Started

Required Equipment

Fishing Rods

Fishing Lures

Fishing Process

Starting to Fish

Waiting Phase

Hook Phase

Fishing Combat

Combat Mechanics

Fish Properties

Player Actions

Combat Resolution

HP Changes

Fishing Monsters

Fishing Monster Properties

Fish Types and Rewards

Common Fish

Uncommon Fish

Rare Fish

Special Rewards

AI Task System

Mode Changes

Fishing Zones

Skill System

Configuration

Fish Data

Fishing Rod Data

Monster Data

Strategy Tips

Terminating Fishing

FAQ

Related Systems

References