The catch was sold at auction. The crew were handed an envelope.
A boat goes out for eight days with twelve crew. The catch is landed and sold at the fish auction. From that figure the owner deducts fuel, ice, provisions and bait, and what remains is split on shares agreed verbally before departure.
The skipper knows the auction figure. The owner knows the deductions. The crew know neither.
Nobody keeps a ledger because nobody has ever kept one, and the argument after a poor trip has no evidence on either side.
One trip, from auction floor to envelope
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The auction
Rp 148 jt
The auction house
Sold by lot to buyers on the floor. A figure exists, on paper, at a known moment. The crew are not there; they are unloading.
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Less fuel
− Rp 41 jt
The owner
Eight days of diesel. A real cost, and one nobody disputes in principle. The amount is stated afterwards, from the owner's records.
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Less ice, bait, provisions
− Rp 19 jt
The owner
Bought before departure by the owner or the skipper. Receipts exist somewhere and are not shown at settlement.
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Less the owner's share
− Rp 44 jt
The owner
The boat's share, agreed by custom rather than in writing. The percentage is known; the base it applies to is the number in dispute.
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The crew pool
Rp 44 jt
Arithmetic
What remains, divided on shares agreed verbally at the dock eight days ago and remembered differently by twelve people.
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One deckhand
Rp 3.1 jt
The envelope
Handed over in cash, with no statement. A deckhand who asks how it was calculated is asking to be left off the next trip.
Every deduction here may be entirely honest. The crew have no way to know, because the only party who sees the auction figure and the receipts is the party doing the subtracting.
If you own a boat, or crew one.
Being designed, nothing to join. The useful thing is how a settlement actually runs where you are, and what the last argument was about.