More than 270 leading marine scientists from 84 research institutes have written to the environment minister, Murray Watt, urging stronger protections for marine ecosystems, as a once-in-a-decade review of marine parks gets under way.

The director of the Marine Futures Lab at the University of Western Australia and an author of the statement sent to Watt, said many species found in Australian waters existed nowhere else on the planet. About a quarter of Australian waters are currently highly protected. But these “no take zones” were concentrated in remote offshore and territorial waters, with minimal coverage in the waters surrounding mainland Australia, the statement said. While the director of the Centre for Biodiversity and Conservation Science at the University of Queensland said the current locations of highly protected areas were “biased towards places that no one goes”.

Watt said the government was “well on the way to meeting the Albanese government’s commitment to highly protect 30% of Australia’s ocean by 2030”, and the proposed expansion of marine parks around Lord Howe and Norfolk islands would achieve the target ahead of time. The marine parks review would provide “further opportunities to better protect key ocean habitats”, he said, “while allowing for sustainable use and conservation”.

The One Nation MP David Farley says the minor party’s net migration target is “not too different” to Labor’s, forcing his leader to issue an urgent clarification amid rising confusion over the policy.

Appearing on the ABC’s Insiders program on Sunday morning, Farley argued skilled workers and backpackers were critical to keeping Australia fed, and argued they should be considered as a separate category to migration “in its true form”. Farley said One Nation’s Nom target remained 130,000. But he said that figure did not include skilled workers, backpackers and Pacific and Timor-Leste labour through the Pacific Australia Labour Mobility (Palm) scheme.

But Hanson issued an implied rebuke on Sunday afternoon, with a post on social media insisting “One Nation’s policy is to cut net overseas migration to 130,000”.

This is the second time Hanson has had to issue a correction after Farley seemed to contradict One Nation’s restrictive approach to immigration. The party has struggled to define its migration policy, with inconsistent messaging over whether its target figure represents net overseas migration (Nom) or permanent migration.

Roblox has committed to making changes to its online gaming platform after Australia’s eSafety commissioner discovered adults were still able to see child accounts and send connection requests without parental consent.

The company has provided a legal agreement to the online safety regulator after testing earlier this year also revealed children and adults could view and respond to one another’s posts on forums outside game environments without parental consent. Additionally, the regulator found children’s connections and profiles – including account names and interests – were visible to anyone on Roblox.

Under the changes, accounts for users under 16 were private by default and included tools to prevent adult users from contacting under-16s without parental consent. Direct chat was also switched off by default until the user had gone through age estimation.

Additionally, parental controls could disable chat for 13- to 15-year-old users, and voice chat was not allowed for the same age group, bringing up the restriction applied to users aged 12 and under.

The eSafety commissioner had raised concerns Roblox may not be compliant with codes and standards under the Online Safety Act, alleging the platform failed to have sufficient measures in place to prevent contact between adults and children. In its announcement on Thursday, eSafety said Roblox had committed to making changes to prevent adults from contacting unknown children without parental consent, and strengthening account settings of children so they are private by default.

Roblox also committed to engaging a third-party auditor to assess its safety measures, including a check of its age-estimation technology.