The best replacement for blowfish is aes.

The best alternatives to blowfish are rated as following:
★★★★★  aes
★★★★  twofish
★★★★  puffer fish
★★★  des
★★  3des
★  sha512
★  md5
★  aes encryption
★  aes openvpn
★  fugu
★  arcfour
★  rc4
★  pbkdf2
  usc alumni
  pufferfish
  aes 256
  aes256
  puffer

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Speaking about blowfish, one probably shouldn't forget about little love lyrics.

Other search terms related to blowfish and their ratings are:
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★ hootie
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Google Trends

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blowfish
aes
twofish