Some people said it was created by Peruvian scientists, that it gorged on the blood of farm animals, that it was a monster. Many myths have grown up in Bolivia around the Paiche, one of the world’s largest scaled freshwater fish which is native to Amazonian rivers of Brazil and Peru and can grow up to four metres long. But after young fish were accidentally released from a Peruvian fish farm, the Paiche has arrived big time in Bolivian rivers.

Every year, it reaches another 40 km of river and is eating all before it, especially smaller native fish stocks including even the deadly piranha. At the same time, the Paiche is proving a boon to many local fisherman who sell it to families and restaurants who are acquiring a taste for it in a land-locked country where meat has always been the favourite form of protein. This gives scientists and the authorities a dilemma. Do they try and control or even eradicate the Paiche from rivers famed for their biodiversity where new species are being identified all the time? Or let its spread continue unabated and provide a useful livelihood for fishermen and a healthy addition to the Bolivian diet? For Assignment, Jane Chambers takes to the rivers of Bolivia

Stephen Sackur looks back at some of HARDtalk’s most impactful and thought-provoking interviews of 2023.

Photographer Andrea Hernández has been travelling around her native Venezuela documenting people and nature for her ongoing project called Mango Season. Mango season in Venezuela is a time of abundance, when mango fruit is plentiful on the trees. During this time of economic crisis and food scarcity in the country, many people can now be seen roaming the streets looking for these fruits to feed themselves and their families.

Presenter: Francis Peña

Mani Djazmi presents a special programme as Crystal Palace defender Joel Ward and the former Portsmouth player Linvoy Primus discuss their Christian faith. We also hear from former USA international Jaelene Daniels, whose religious beliefs led her to turn down the chance to continue playing for her country.

There’s no doubt this has been Taylor Swift’s year. Just 34 years old, the American singer songwriter has been in the music industry for more than half her life. She’s a multi-award winning performer whose diehard fans have helped her break all sorts of records.

Time Magazine’s 2023 Person of the Year is also the most streamed female artist on Spotify and Apple and this week she achieved a record 90 weeks at number 1 on the US Billboard Artist 100 chart.

Swift’s Eras tour, which began in March this year and concludes at the end of 2024, has become the first to gross over $1 billion. Wherever Swift’s concerts land, they bring a big boost in the local economy.

Host James Reynolds hears about Swift’s appeal from those with a professional and personal interest in the singer-songwriter. They include the first full-time Taylor Swift reporter and also the professor who is about to start teaching a ‘Taylor Swift and her World’ course to students at Harvard University.

We also meet fans - or Swifties - from across four continents about why her songs are so special.

“I was in the southern most part of Africa,” says Agape, who is from Cape Town and currently studying in the UK. “But I felt, even in her song lyrics, like she was writing for me or about me.”

Many mythological creatures and traditions we know, love, and more importantly fear, owe their origins to Celtic folklore. Borrowed to create epic franchises such as Harry Potter, Lord of the Rings, Game of Thrones, the countless adaptations of Bram Stoker’s Dracula and Walt Disney’s Peter Pan, this programme casts new light on the subject. Seanchaí (shan-a-key) were/are traditional Irish storytellers and the custodians of history for centuries in Ireland. They can recite ancient lore and tales of wisdom whenever it was needed and could be considered as something of the Google of ancient times. The Irish people have created a unique and beautifully poetic oral literature.

Rebuilding Ukraine after the destruction inflicted by Russia will be a gigantic task. Foreign donors have pledged billions of dollars. But they want reassurances that the money will be properly spent, in a country which still has high levels of corruption. For Assignment Tim Whewell visits Bucha, near the capital Kyiv, site of some of the worst Russian atrocities, to see the beginning of reconstruction. A series of shocking reports by Ukrainian journalists into alleged misuse of rebuilding funds have forced local authorities in the area to explain themselves. But a new state reconstruction agency committed to transparency has now also started work in Bucha. And anti-corruption campaigners believe a new digital accounting and monitoring system they are developing in collaboration with the authorities will help turn Ukraine into a world beacon of openness. The government's slogan is "build back better." But what exactly does that mean? And can it be achieved?

In a remote corner of Northern Kenya, former Samburu warriors continue to rescue orphaned and abandoned baby elephants, even as drought has put on hold plans to release them back into the wild. Traditionally Samburu warriors are not only charged with protecting their community, but with caring for their livestock. Now they have turned their attention to raising elephants. At Reteti Elephant Sanctuary, they rescue baby elephants that have been injured, orphaned or abandoned. They look after them, rehabilitate them and release them back to the wild. It is transforming the way local communities relate to elephants, in a way that benefits both humans and animals. But drought has meant their rewilding programme has been put on hold until the rains come.

Ivo van Hove is the most sought-after theatre director in the world. We join him in Paris, London and Amsterdam, where he works on productions that are often maximal - big musicals, operas and dramas such as The Damned - but where he also loves to stage minimal intimate dramas, such as The Glass Menagerie or A Little Life. How does van Hove work? Why are actors of the calibre of James Norton and Isabel Huppert so willing to work with him? And what drives his relentless thirst to bring new experiences to the theatre audience?

Ukrainian President Volodymyr Zelensky knows that if he has any hope of victory in the war in his country he needs his international friends to keep backing him. Although the size of that task was pretty clear this week, in both the United States and Europe, when he returned largely empty handed - for now, at least. Russian President Vladimir Putin, on the other hand, says he remains up for the fight and talked confidently about ultimate success. It is now approaching two years of war in Ukraine. Despite both leaders talking of victory, the fighting and losses continue and neither side has been making much progress on the battlefield. In this edition, we hear conversations among Ukrainians. They talk about the emotional impact of the fighting but also how they are able to have plans despite the war. Three residents of Kyiv share their experiences, including Iryna, on how the approach of a second Christmas at war has affected her wedding plans to her British fiance. “When first he proposed I said yeah, we’re going to do it after the war, after we will win,” says Iryna. "But now it’s so long already and I feel like I just paused my life. So we decided to get married next year.” Host James Reynolds also hears from a woman whose brother was captured in the Ukrainian port city of Mariupol and brings together Ukrainians in the UK and Poland. A Boffin Media production in partnership with the BBC OS team. (Photo: Iryna and her fiance Reese)