diff --git a/ApiCore-Backend/src/app.module.ts b/ApiCore-Backend/src/app.module.ts
index b456e91..5dfda78 100644
--- a/ApiCore-Backend/src/app.module.ts
+++ b/ApiCore-Backend/src/app.module.ts
@@ -7,6 +7,7 @@ import { AuditModule } from './audit/audit.module';
 import { UsersModule } from './users/users.module';
 import { AuthModule } from './auth/auth.module';
 import { ApiariesModule } from './apiaries/apiaries.module';
+import { ColoniesModule } from './colonies/colonies.module';
 import { JwtAuthGuard } from './auth/guards/jwt-auth.guard';
 import { RolesGuard } from './auth/guards/roles.guard';
 
@@ -19,6 +20,7 @@ import { RolesGuard } from './auth/guards/roles.guard';
     UsersModule,
     AuthModule,
     ApiariesModule,
+    ColoniesModule,
   ],
   controllers: [],
   providers: [
diff --git a/ApiCore-Backend/src/colonies/colonies.controller.ts b/ApiCore-Backend/src/colonies/colonies.controller.ts
new file mode 100644
index 0000000..f9f0915
--- /dev/null
+++ b/ApiCore-Backend/src/colonies/colonies.controller.ts
@@ -0,0 +1,89 @@
+import { Body, Controller, Get, Param, Patch, Post } from '@nestjs/common';
+import { ApiBearerAuth, ApiTags } from '@nestjs/swagger';
+import { Role } from '../../generated/prisma';
+import { Roles } from '../auth/decorators/roles.decorator';
+import { CurrentUser } from '../auth/decorators/current-user.decorator';
+import type { AuthenticatedUser } from '../auth/types/authenticated-user';
+import { CreateColonyDto } from './dto/create-colony.dto';
+import { UpdateColonyDto } from './dto/update-colony.dto';
+import { MoveColonyDto } from './dto/move-colony.dto';
+import { SplitColonyDto } from './dto/split-colony.dto';
+import { MergeColonyDto } from './dto/merge-colony.dto';
+import { ColoniesService } from './colonies.service';
+
+@ApiTags('colonies')
+@ApiBearerAuth()
+@Controller('colonies')
+export class ColoniesController {
+  constructor(private readonly coloniesService: ColoniesService) {}
+
+  @Get()
+  findAll() {
+    return this.coloniesService.findAll();
+  }
+
+  @Get(':id')
+  findOne(@Param('id') id: string) {
+    return this.coloniesService.findById(id);
+  }
+
+  @Get(':id/history')
+  getHistory(@Param('id') id: string) {
+    return this.coloniesService.getHistory(id);
+  }
+
+  @Roles(Role.ADMIN, Role.BEEKEEPER)
+  @Post()
+  create(
+    @Body() dto: CreateColonyDto,
+    @CurrentUser() actor: AuthenticatedUser,
+  ) {
+    return this.coloniesService.create(dto, actor.id);
+  }
+
+  @Roles(Role.ADMIN, Role.BEEKEEPER)
+  @Patch(':id')
+  update(
+    @Param('id') id: string,
+    @Body() dto: UpdateColonyDto,
+    @CurrentUser() actor: AuthenticatedUser,
+  ) {
+    return this.coloniesService.update(id, dto, actor.id);
+  }
+
+  @Roles(Role.ADMIN, Role.BEEKEEPER)
+  @Post(':id/move')
+  move(
+    @Param('id') id: string,
+    @Body() dto: MoveColonyDto,
+    @CurrentUser() actor: AuthenticatedUser,
+  ) {
+    return this.coloniesService.move(id, dto, actor.id);
+  }
+
+  @Roles(Role.ADMIN, Role.BEEKEEPER)
+  @Post(':id/split')
+  split(
+    @Param('id') id: string,
+    @Body() dto: SplitColonyDto,
+    @CurrentUser() actor: AuthenticatedUser,
+  ) {
+    return this.coloniesService.split(id, dto, actor.id);
+  }
+
+  @Roles(Role.ADMIN, Role.BEEKEEPER)
+  @Post(':id/merge')
+  merge(
+    @Param('id') id: string,
+    @Body() dto: MergeColonyDto,
+    @CurrentUser() actor: AuthenticatedUser,
+  ) {
+    return this.coloniesService.merge(id, dto, actor.id);
+  }
+
+  @Roles(Role.ADMIN, Role.BEEKEEPER)
+  @Post(':id/dissolve')
+  dissolve(@Param('id') id: string, @CurrentUser() actor: AuthenticatedUser) {
+    return this.coloniesService.dissolve(id, actor.id);
+  }
+}
diff --git a/ApiCore-Backend/src/colonies/colonies.module.ts b/ApiCore-Backend/src/colonies/colonies.module.ts
new file mode 100644
index 0000000..18cbd42
--- /dev/null
+++ b/ApiCore-Backend/src/colonies/colonies.module.ts
@@ -0,0 +1,10 @@
+import { Module } from '@nestjs/common';
+import { ColoniesController } from './colonies.controller';
+import { ColoniesService } from './colonies.service';
+
+@Module({
+  controllers: [ColoniesController],
+  providers: [ColoniesService],
+  exports: [ColoniesService],
+})
+export class ColoniesModule {}
diff --git a/ApiCore-Backend/src/colonies/colonies.service.spec.ts b/ApiCore-Backend/src/colonies/colonies.service.spec.ts
new file mode 100644
index 0000000..14eeeb4
--- /dev/null
+++ b/ApiCore-Backend/src/colonies/colonies.service.spec.ts
@@ -0,0 +1,160 @@
+import { NotFoundException } from '@nestjs/common';
+import { ColoniesService } from './colonies.service';
+import { PrismaService } from '../prisma/prisma.service';
+import { AuditLogService } from '../audit/audit-log.service';
+
+describe('ColoniesService', () => {
+  let service: ColoniesService;
+  let tx: {
+    colony: { create: jest.Mock; update: jest.Mock; findUnique: jest.Mock };
+    colonyApiaryHistory: { create: jest.Mock };
+    colonyLineage: { create: jest.Mock };
+  };
+  let prisma: {
+    colony: {
+      findMany: jest.Mock;
+      findUnique: jest.Mock;
+      create: jest.Mock;
+      update: jest.Mock;
+    };
+    colonyApiaryHistory: { findMany: jest.Mock };
+    queenColonyHistory: { findMany: jest.Mock };
+    colonyLineage: { findMany: jest.Mock };
+    $transaction: jest.Mock;
+  };
+  let auditLog: { record: jest.Mock };
+
+  const parentColony = {
+    id: 'colony-1',
+    code: 'V-001',
+    apiaryId: 'apiary-1',
+    status: 'ACTIVE',
+    deactivatedAt: null,
+  };
+
+  beforeEach(() => {
+    tx = {
+      colony: { create: jest.fn(), update: jest.fn(), findUnique: jest.fn() },
+      colonyApiaryHistory: { create: jest.fn() },
+      colonyLineage: { create: jest.fn() },
+    };
+    prisma = {
+      colony: {
+        findMany: jest.fn(),
+        findUnique: jest.fn(),
+        create: jest.fn(),
+        update: jest.fn(),
+      },
+      colonyApiaryHistory: { findMany: jest.fn() },
+      queenColonyHistory: { findMany: jest.fn() },
+      colonyLineage: { findMany: jest.fn() },
+      $transaction: jest.fn((callback: (txArg: typeof tx) => unknown) =>
+        callback(tx),
+      ),
+    };
+    auditLog = { record: jest.fn().mockResolvedValue(undefined) };
+    service = new ColoniesService(
+      prisma as unknown as PrismaService,
+      auditLog as unknown as AuditLogService,
+    );
+  });
+
+  it('findById throws NotFoundException when missing', async () => {
+    prisma.colony.findUnique.mockResolvedValue(null);
+    await expect(service.findById('missing')).rejects.toBeInstanceOf(
+      NotFoundException,
+    );
+  });
+
+  it('move updates the apiary and records apiary history', async () => {
+    prisma.colony.findUnique.mockResolvedValue(parentColony);
+    tx.colony.update.mockResolvedValue({
+      ...parentColony,
+      apiaryId: 'apiary-2',
+    });
+    tx.colonyApiaryHistory.create.mockResolvedValue({});
+
+    const result = await service.move(
+      'colony-1',
+      { apiaryId: 'apiary-2' },
+      'user-1',
+    );
+
+    expect(result.apiaryId).toBe('apiary-2');
+    const [[historyArg]] = tx.colonyApiaryHistory.create.mock.calls as [
+      [{ data: { colonyId: string; apiaryId: string } }],
+    ];
+    expect(historyArg.data.colonyId).toBe('colony-1');
+    expect(historyArg.data.apiaryId).toBe('apiary-2');
+  });
+
+  it('split creates a new colony and a SPLIT lineage entry', async () => {
+    prisma.colony.findUnique.mockResolvedValue(parentColony);
+    const child = { id: 'colony-2', code: 'V-001-A', apiaryId: 'apiary-1' };
+    tx.colony.create.mockResolvedValue(child);
+    tx.colonyLineage.create.mockResolvedValue({});
+
+    const result = await service.split(
+      'colony-1',
+      { code: 'V-001-A', colonyType: 'NUCLEUS_COLONY' },
+      'user-1',
+    );
+
+    expect(result).toEqual(child);
+    const [[lineageArg]] = tx.colonyLineage.create.mock.calls as [
+      [{ data: { type: string; fromColonyId: string; toColonyId: string } }],
+    ];
+    expect(lineageArg.data.type).toBe('SPLIT');
+    expect(lineageArg.data.fromColonyId).toBe('colony-1');
+    expect(lineageArg.data.toColonyId).toBe('colony-2');
+  });
+
+  it('merge marks the merged colony as MERGED and records a MERGE lineage entry', async () => {
+    prisma.colony.findUnique
+      .mockResolvedValueOnce(parentColony)
+      .mockResolvedValueOnce({
+        ...parentColony,
+        id: 'colony-1',
+      });
+    tx.colony.findUnique.mockResolvedValue({
+      id: 'colony-3',
+      status: 'ACTIVE',
+    });
+    tx.colony.update.mockResolvedValue({});
+    tx.colonyLineage.create.mockResolvedValue({});
+
+    await service.merge(
+      'colony-1',
+      { mergedColonyIds: ['colony-3'] },
+      'user-1',
+    );
+
+    const [[updateArg]] = tx.colony.update.mock.calls as [
+      [{ where: { id: string }; data: { status: string } }],
+    ];
+    expect(updateArg.where.id).toBe('colony-3');
+    expect(updateArg.data.status).toBe('MERGED');
+
+    const [[lineageArg]] = tx.colonyLineage.create.mock.calls as [
+      [{ data: { type: string; fromColonyId: string; toColonyId: string } }],
+    ];
+    expect(lineageArg.data.type).toBe('MERGE');
+    expect(lineageArg.data.fromColonyId).toBe('colony-3');
+    expect(lineageArg.data.toColonyId).toBe('colony-1');
+  });
+
+  it('dissolve sets status DISSOLVED and records DEACTIVATE', async () => {
+    prisma.colony.findUnique.mockResolvedValue(parentColony);
+    prisma.colony.update.mockResolvedValue({
+      ...parentColony,
+      status: 'DISSOLVED',
+    });
+
+    const result = await service.dissolve('colony-1', 'user-1');
+
+    expect(result.status).toBe('DISSOLVED');
+    expect(auditLog.record).toHaveBeenCalledWith(
+      expect.objectContaining({ action: 'DEACTIVATE' }),
+    );
+  });
+});
diff --git a/ApiCore-Backend/src/colonies/colonies.service.ts b/ApiCore-Backend/src/colonies/colonies.service.ts
new file mode 100644
index 0000000..272b044
--- /dev/null
+++ b/ApiCore-Backend/src/colonies/colonies.service.ts
@@ -0,0 +1,205 @@
+import { Injectable, NotFoundException } from '@nestjs/common';
+import { PrismaService } from '../prisma/prisma.service';
+import { AuditLogService } from '../audit/audit-log.service';
+import { Colony } from '../../generated/prisma';
+import { CreateColonyDto } from './dto/create-colony.dto';
+import { UpdateColonyDto } from './dto/update-colony.dto';
+import { MoveColonyDto } from './dto/move-colony.dto';
+import { SplitColonyDto } from './dto/split-colony.dto';
+import { MergeColonyDto } from './dto/merge-colony.dto';
+
+@Injectable()
+export class ColoniesService {
+  constructor(
+    private readonly prisma: PrismaService,
+    private readonly auditLog: AuditLogService,
+  ) {}
+
+  async findAll(): Promise<Colony[]> {
+    return this.prisma.colony.findMany({ orderBy: { code: 'asc' } });
+  }
+
+  async findById(id: string): Promise<Colony> {
+    const colony = await this.prisma.colony.findUnique({ where: { id } });
+    if (!colony) {
+      throw new NotFoundException('Colony not found');
+    }
+    return colony;
+  }
+
+  async create(dto: CreateColonyDto, actingUserId: string): Promise<Colony> {
+    const colony = await this.prisma.colony.create({ data: { ...dto } });
+    await this.auditLog.record({
+      entityType: 'Colony',
+      entityId: colony.id,
+      action: 'CREATE',
+      userId: actingUserId,
+      afterData: colony,
+    });
+    return colony;
+  }
+
+  async update(
+    id: string,
+    dto: UpdateColonyDto,
+    actingUserId: string,
+  ): Promise<Colony> {
+    const before = await this.findById(id);
+    const colony = await this.prisma.colony.update({
+      where: { id },
+      data: { ...dto },
+    });
+    await this.auditLog.record({
+      entityType: 'Colony',
+      entityId: id,
+      action: 'UPDATE',
+      userId: actingUserId,
+      beforeData: before,
+      afterData: colony,
+    });
+    return colony;
+  }
+
+  async move(
+    id: string,
+    dto: MoveColonyDto,
+    actingUserId: string,
+  ): Promise<Colony> {
+    const before = await this.findById(id);
+    const colony = await this.prisma.$transaction(async (tx) => {
+      const updated = await tx.colony.update({
+        where: { id },
+        data: { apiaryId: dto.apiaryId },
+      });
+      await tx.colonyApiaryHistory.create({
+        data: {
+          colonyId: id,
+          apiaryId: dto.apiaryId,
+          movedByUserId: actingUserId,
+          notes: dto.notes,
+        },
+      });
+      return updated;
+    });
+    await this.auditLog.record({
+      entityType: 'Colony',
+      entityId: id,
+      action: 'UPDATE',
+      userId: actingUserId,
+      beforeData: before,
+      afterData: colony,
+    });
+    return colony;
+  }
+
+  async split(
+    id: string,
+    dto: SplitColonyDto,
+    actingUserId: string,
+  ): Promise<Colony> {
+    const parent = await this.findById(id);
+    const child = await this.prisma.$transaction(async (tx) => {
+      const created = await tx.colony.create({
+        data: {
+          code: dto.code,
+          apiaryId: parent.apiaryId,
+          colonyType: dto.colonyType,
+          notes: dto.notes,
+        },
+      });
+      await tx.colonyLineage.create({
+        data: {
+          type: 'SPLIT',
+          fromColonyId: parent.id,
+          toColonyId: created.id,
+          date: new Date(),
+          notes: dto.notes,
+        },
+      });
+      return created;
+    });
+    await this.auditLog.record({
+      entityType: 'Colony',
+      entityId: child.id,
+      action: 'CREATE',
+      userId: actingUserId,
+      afterData: { ...child, splitFromColonyId: parent.id },
+    });
+    return child;
+  }
+
+  async merge(
+    id: string,
+    dto: MergeColonyDto,
+    actingUserId: string,
+  ): Promise<Colony> {
+    const survivor = await this.findById(id);
+    await this.prisma.$transaction(async (tx) => {
+      for (const mergedColonyId of dto.mergedColonyIds) {
+        const merged = await tx.colony.findUnique({
+          where: { id: mergedColonyId },
+        });
+        if (!merged) {
+          throw new NotFoundException(`Colony ${mergedColonyId} not found`);
+        }
+        await tx.colony.update({
+          where: { id: mergedColonyId },
+          data: { status: 'MERGED', deactivatedAt: new Date() },
+        });
+        await tx.colonyLineage.create({
+          data: {
+            type: 'MERGE',
+            fromColonyId: mergedColonyId,
+            toColonyId: survivor.id,
+            date: new Date(),
+            notes: dto.notes,
+          },
+        });
+      }
+    });
+    await this.auditLog.record({
+      entityType: 'Colony',
+      entityId: survivor.id,
+      action: 'UPDATE',
+      userId: actingUserId,
+      beforeData: survivor,
+      afterData: { ...survivor, mergedColonyIds: dto.mergedColonyIds },
+    });
+    return this.findById(survivor.id);
+  }
+
+  async dissolve(id: string, actingUserId: string): Promise<Colony> {
+    const before = await this.findById(id);
+    const colony = await this.prisma.colony.update({
+      where: { id },
+      data: { status: 'DISSOLVED', deactivatedAt: new Date() },
+    });
+    await this.auditLog.record({
+      entityType: 'Colony',
+      entityId: id,
+      action: 'DEACTIVATE',
+      userId: actingUserId,
+      beforeData: before,
+      afterData: colony,
+    });
+    return colony;
+  }
+
+  async getHistory(id: string) {
+    await this.findById(id);
+    const [apiaryHistory, queenHistory, lineageAsSource, lineageAsResult] =
+      await Promise.all([
+        this.prisma.colonyApiaryHistory.findMany({
+          where: { colonyId: id },
+          orderBy: { movedAt: 'desc' },
+        }),
+        this.prisma.queenColonyHistory.findMany({
+          where: { colonyId: id },
+          orderBy: { startDate: 'desc' },
+        }),
+        this.prisma.colonyLineage.findMany({ where: { fromColonyId: id } }),
+        this.prisma.colonyLineage.findMany({ where: { toColonyId: id } }),
+      ]);
+    return { apiaryHistory, queenHistory, lineageAsSource, lineageAsResult };
+  }
+}
diff --git a/ApiCore-Backend/src/colonies/dto/create-colony.dto.ts b/ApiCore-Backend/src/colonies/dto/create-colony.dto.ts
new file mode 100644
index 0000000..97b7e2a
--- /dev/null
+++ b/ApiCore-Backend/src/colonies/dto/create-colony.dto.ts
@@ -0,0 +1,52 @@
+import { ApiProperty, ApiPropertyOptional } from '@nestjs/swagger';
+import { IsEnum, IsInt, IsOptional, IsString } from 'class-validator';
+import { ColonyType } from '../../../generated/prisma';
+
+export class CreateColonyDto {
+  @ApiProperty()
+  @IsString()
+  code!: string;
+
+  @ApiProperty()
+  @IsString()
+  apiaryId!: string;
+
+  @ApiProperty({ enum: ColonyType })
+  @IsEnum(ColonyType)
+  colonyType!: ColonyType;
+
+  @ApiPropertyOptional()
+  @IsOptional()
+  @IsString()
+  hiveType?: string;
+
+  @ApiPropertyOptional()
+  @IsOptional()
+  @IsString()
+  originText?: string;
+
+  @ApiPropertyOptional()
+  @IsOptional()
+  @IsInt()
+  strength?: number;
+
+  @ApiPropertyOptional()
+  @IsOptional()
+  @IsString()
+  broodStatus?: string;
+
+  @ApiPropertyOptional()
+  @IsOptional()
+  @IsString()
+  feedStatus?: string;
+
+  @ApiPropertyOptional()
+  @IsOptional()
+  @IsString()
+  healthStatus?: string;
+
+  @ApiPropertyOptional()
+  @IsOptional()
+  @IsString()
+  notes?: string;
+}
diff --git a/ApiCore-Backend/src/colonies/dto/merge-colony.dto.ts b/ApiCore-Backend/src/colonies/dto/merge-colony.dto.ts
new file mode 100644
index 0000000..4b1a484
--- /dev/null
+++ b/ApiCore-Backend/src/colonies/dto/merge-colony.dto.ts
@@ -0,0 +1,15 @@
+import { ApiProperty, ApiPropertyOptional } from '@nestjs/swagger';
+import { ArrayMinSize, IsArray, IsOptional, IsString } from 'class-validator';
+
+export class MergeColonyDto {
+  @ApiProperty({ type: [String] })
+  @IsArray()
+  @ArrayMinSize(1)
+  @IsString({ each: true })
+  mergedColonyIds!: string[];
+
+  @ApiPropertyOptional()
+  @IsOptional()
+  @IsString()
+  notes?: string;
+}
diff --git a/ApiCore-Backend/src/colonies/dto/move-colony.dto.ts b/ApiCore-Backend/src/colonies/dto/move-colony.dto.ts
new file mode 100644
index 0000000..7ea714a
--- /dev/null
+++ b/ApiCore-Backend/src/colonies/dto/move-colony.dto.ts
@@ -0,0 +1,13 @@
+import { ApiProperty, ApiPropertyOptional } from '@nestjs/swagger';
+import { IsOptional, IsString } from 'class-validator';
+
+export class MoveColonyDto {
+  @ApiProperty()
+  @IsString()
+  apiaryId!: string;
+
+  @ApiPropertyOptional()
+  @IsOptional()
+  @IsString()
+  notes?: string;
+}
diff --git a/ApiCore-Backend/src/colonies/dto/split-colony.dto.ts b/ApiCore-Backend/src/colonies/dto/split-colony.dto.ts
new file mode 100644
index 0000000..ee5100b
--- /dev/null
+++ b/ApiCore-Backend/src/colonies/dto/split-colony.dto.ts
@@ -0,0 +1,18 @@
+import { ApiProperty, ApiPropertyOptional } from '@nestjs/swagger';
+import { IsEnum, IsOptional, IsString } from 'class-validator';
+import { ColonyType } from '../../../generated/prisma';
+
+export class SplitColonyDto {
+  @ApiProperty()
+  @IsString()
+  code!: string;
+
+  @ApiProperty({ enum: ColonyType })
+  @IsEnum(ColonyType)
+  colonyType!: ColonyType;
+
+  @ApiPropertyOptional()
+  @IsOptional()
+  @IsString()
+  notes?: string;
+}
diff --git a/ApiCore-Backend/src/colonies/dto/update-colony.dto.ts b/ApiCore-Backend/src/colonies/dto/update-colony.dto.ts
new file mode 100644
index 0000000..a4ccbcf
--- /dev/null
+++ b/ApiCore-Backend/src/colonies/dto/update-colony.dto.ts
@@ -0,0 +1,24 @@
+import { ApiPropertyOptional, PartialType, PickType } from '@nestjs/swagger';
+import { IsEnum, IsOptional } from 'class-validator';
+import { ColonyStatus } from '../../../generated/prisma';
+import { CreateColonyDto } from './create-colony.dto';
+
+class UpdatableColonyFieldsDto extends PartialType(
+  PickType(CreateColonyDto, [
+    'hiveType',
+    'originText',
+    'colonyType',
+    'strength',
+    'broodStatus',
+    'feedStatus',
+    'healthStatus',
+    'notes',
+  ] as const),
+) {}
+
+export class UpdateColonyDto extends UpdatableColonyFieldsDto {
+  @ApiPropertyOptional({ enum: ColonyStatus })
+  @IsOptional()
+  @IsEnum(ColonyStatus)
+  status?: ColonyStatus;
+}
diff --git a/ApiCore-Backend/test/colonies.e2e-spec.ts b/ApiCore-Backend/test/colonies.e2e-spec.ts
new file mode 100644
index 0000000..acad51b
--- /dev/null
+++ b/ApiCore-Backend/test/colonies.e2e-spec.ts
@@ -0,0 +1,192 @@
+import { INestApplication } from '@nestjs/common';
+import * as bcrypt from 'bcryptjs';
+import request from 'supertest';
+import { App } from 'supertest/types';
+import { PrismaService } from '../src/prisma/prisma.service';
+import { createTestApp } from './utils/create-test-app';
+import { login } from './utils/api';
+
+interface ColonyBody {
+  id: string;
+  code: string;
+  apiaryId: string;
+  status: string;
+}
+
+interface ColonyHistoryBody {
+  apiaryHistory: unknown[];
+  queenHistory: unknown[];
+  lineageAsSource: unknown[];
+  lineageAsResult: unknown[];
+}
+
+describe('Colonies (e2e)', () => {
+  let app: INestApplication<App>;
+  let prisma: PrismaService;
+  const beekeeperEmail = `colonies-e2e-beekeeper-${Date.now()}@example.com`;
+  const staffEmail = `colonies-e2e-staff-${Date.now()}@example.com`;
+  const password = 'SuperSecret123!';
+  let beekeeperId: string;
+  let staffId: string;
+  let beekeeperToken: string;
+  let staffToken: string;
+  let apiaryAId: string;
+  let apiaryBId: string;
+  let colonyId: string;
+  let childColonyId: string;
+  let colonyToMergeId: string;
+
+  beforeAll(async () => {
+    app = await createTestApp();
+    prisma = app.get(PrismaService);
+
+    const passwordHash = await bcrypt.hash(password, 12);
+    const beekeeper = await prisma.user.create({
+      data: {
+        email: beekeeperEmail,
+        passwordHash,
+        name: 'Beekeeper',
+        role: 'BEEKEEPER',
+      },
+    });
+    beekeeperId = beekeeper.id;
+    const staff = await prisma.user.create({
+      data: { email: staffEmail, passwordHash, name: 'Staff', role: 'STAFF' },
+    });
+    staffId = staff.id;
+
+    beekeeperToken = (await login(app, beekeeperEmail, password)).accessToken;
+    staffToken = (await login(app, staffEmail, password)).accessToken;
+
+    const apiaryA = await prisma.apiary.create({
+      data: { name: `Stand A ${Date.now()}` },
+    });
+    apiaryAId = apiaryA.id;
+    const apiaryB = await prisma.apiary.create({
+      data: { name: `Stand B ${Date.now()}` },
+    });
+    apiaryBId = apiaryB.id;
+  });
+
+  afterAll(async () => {
+    await prisma.colonyLineage.deleteMany({
+      where: { OR: [{ fromColonyId: colonyId }, { toColonyId: colonyId }] },
+    });
+    await prisma.colonyApiaryHistory.deleteMany({ where: { colonyId } });
+    await prisma.colony.deleteMany({
+      where: {
+        id: { in: [colonyId, childColonyId, colonyToMergeId].filter(Boolean) },
+      },
+    });
+    await prisma.apiary.deleteMany({
+      where: { id: { in: [apiaryAId, apiaryBId] } },
+    });
+    await prisma.refreshToken.deleteMany({
+      where: { userId: { in: [beekeeperId, staffId] } },
+    });
+    await prisma.auditLog.deleteMany({
+      where: { userId: { in: [beekeeperId, staffId] } },
+    });
+    await prisma.user.deleteMany({
+      where: { id: { in: [beekeeperId, staffId] } },
+    });
+    await app.close();
+  });
+
+  it('rejects colony creation for STAFF', () => {
+    return request(app.getHttpServer())
+      .post('/api/v1/colonies')
+      .set('Authorization', `Bearer ${staffToken}`)
+      .send({
+        code: `V-${Date.now()}`,
+        apiaryId: apiaryAId,
+        colonyType: 'PRODUCTION_COLONY',
+      })
+      .expect(403);
+  });
+
+  it('lets a BEEKEEPER create a colony', async () => {
+    const response = await request(app.getHttpServer())
+      .post('/api/v1/colonies')
+      .set('Authorization', `Bearer ${beekeeperToken}`)
+      .send({
+        code: `V-${Date.now()}`,
+        apiaryId: apiaryAId,
+        colonyType: 'PRODUCTION_COLONY',
+      })
+      .expect(201);
+    const created = response.body as ColonyBody;
+    expect(created.apiaryId).toBe(apiaryAId);
+    colonyId = created.id;
+  });
+
+  it('moves the colony to another apiary and records history', async () => {
+    const response = await request(app.getHttpServer())
+      .post(`/api/v1/colonies/${colonyId}/move`)
+      .set('Authorization', `Bearer ${beekeeperToken}`)
+      .send({ apiaryId: apiaryBId, notes: 'Umzug' })
+      .expect(201);
+    expect((response.body as ColonyBody).apiaryId).toBe(apiaryBId);
+
+    const history = await request(app.getHttpServer())
+      .get(`/api/v1/colonies/${colonyId}/history`)
+      .set('Authorization', `Bearer ${beekeeperToken}`)
+      .expect(200);
+    expect((history.body as ColonyHistoryBody).apiaryHistory).toHaveLength(1);
+  });
+
+  it('splits the colony into a new nucleus colony', async () => {
+    const response = await request(app.getHttpServer())
+      .post(`/api/v1/colonies/${colonyId}/split`)
+      .set('Authorization', `Bearer ${beekeeperToken}`)
+      .send({ code: `V-${Date.now()}-A`, colonyType: 'NUCLEUS_COLONY' })
+      .expect(201);
+    const child = response.body as ColonyBody;
+    expect(child.apiaryId).toBe(apiaryBId);
+    childColonyId = child.id;
+
+    const history = await request(app.getHttpServer())
+      .get(`/api/v1/colonies/${colonyId}/history`)
+      .set('Authorization', `Bearer ${beekeeperToken}`)
+      .expect(200);
+    expect((history.body as ColonyHistoryBody).lineageAsSource).toHaveLength(1);
+  });
+
+  it('merges another colony into the surviving one', async () => {
+    const otherColony = await request(app.getHttpServer())
+      .post('/api/v1/colonies')
+      .set('Authorization', `Bearer ${beekeeperToken}`)
+      .send({
+        code: `V-${Date.now()}-M`,
+        apiaryId: apiaryBId,
+        colonyType: 'PRODUCTION_COLONY',
+      })
+      .expect(201);
+    colonyToMergeId = (otherColony.body as ColonyBody).id;
+
+    await request(app.getHttpServer())
+      .post(`/api/v1/colonies/${colonyId}/merge`)
+      .set('Authorization', `Bearer ${beekeeperToken}`)
+      .send({ mergedColonyIds: [colonyToMergeId] })
+      .expect(201);
+
+    const merged = await request(app.getHttpServer())
+      .get(`/api/v1/colonies/${colonyToMergeId}`)
+      .set('Authorization', `Bearer ${beekeeperToken}`)
+      .expect(200);
+    expect((merged.body as ColonyBody).status).toBe('MERGED');
+  });
+
+  it('dissolves the colony without deleting it', async () => {
+    const response = await request(app.getHttpServer())
+      .post(`/api/v1/colonies/${colonyId}/dissolve`)
+      .set('Authorization', `Bearer ${beekeeperToken}`)
+      .expect(201);
+    expect((response.body as ColonyBody).status).toBe('DISSOLVED');
+
+    await request(app.getHttpServer())
+      .get(`/api/v1/colonies/${colonyId}`)
+      .set('Authorization', `Bearer ${staffToken}`)
+      .expect(200);
+  });
+});
diff --git a/TASKS.md b/TASKS.md
index dc24655..056c87a 100644
--- a/TASKS.md
+++ b/TASKS.md
@@ -34,7 +34,7 @@ Abgeleitet aus [`docs/lastenheft.md`](docs/lastenheft.md) Abschnitt 26. Reihenfo
 - Backend: `ColoniesModule` (inkl. `ColonyApiaryHistory`, `ColonyLineage` für Ableger/Vereinigung)
 - Endpunkte: `GET/POST /api/v1/colonies`, `GET/PATCH /api/v1/colonies/:id`, `POST /api/v1/colonies/:id/move`, `POST /api/v1/colonies/:id/split`, `POST /api/v1/colonies/:id/merge`, `POST /api/v1/colonies/:id/dissolve`, `GET /api/v1/colonies/:id/history`
 - Frontend: `/colonies`, `/colonies/[id]`, `/colonies/new`
-- [ ] Backend-Modul fertig, getestet, grün, committet
+- [x] Backend-Modul fertig, getestet, grün, committet
 - [ ] Frontend-Views fertig, getestet, grün, committet
 
 ### 4. Königinnen