Biashara finished in fourth place in this season's Premier League standings with 50 points from 34 matches.
Simba SC won the Premier League's silverware, followed by Yanga (second place), whilst Azam FC ended third.
The fourth-placed Biashara United, for that matter, managed to make it to the CAF Confederation Cup, as is the case for Azam FC.
Players offloaded by the Mara club are Tariq Simba, Kauswa Bernard, Hassan Mkilindi, Jonathan Zephania, Joseph Ziwa, Ally Mwasomola, and Jackson Edward.
Baraka Makoba, Angelo Malima, Yusuph Abdullwaheed, Ambrose Ayoy, Yusuph Jamal, Juma Mpakala, and Mushta Batozi also make the list.
Biashara United's Secretary General, Haji Mtete, cited the reasons for leaving the players as contracts expiry, breach of contracts, and disciplinary problems.
He mentioned those, who are out of contract, as Batozi, Yusuph Jamal, Abdullwaheed, and Zephania, while Edward was released due to disciplinary issues.
Mtete mentioned the players, who have not been handed contract extension because of facing dip in form, as Simba, Bernard, Mpakala, Ayoy, Malima, Makoba, Mwasomola, Mkilindi, and Ziwa.
The official disclosed: "Most of their contracts have expired, some of the players' standard has dropped, such players did not convince the coach to retain them.''
He noted: ''There are players who were registered and some promoted from our youth team, but you find out since a player was brought in he has not played a single match so that means he is not competent.''
He revealed: ''We are going to sign new players so we can't stay with players who underperform and those who are out of the coach's plans, the coach has seen it fit to leave them and let them look for new challenges elsewhere," he said.
It has moreover been reported if all goes well, the club's captain, defender Abdulmajid Mangalo, could join Simba SC and secure an opportunity to play for the team in CAF Champions League.
It was initially alleged that Yanga was seeking to sign the defender but they failed and now Simba SC is said to be close to recruiting the defender.
Simba SC has reportedly held talks with the defender as part of their plans to strengthen their squad for next season.