1. Insights into the taxonomy and mitochondrial phylogenetic affinity of the longnose goby, Awaous jayakari (Teleostei: Gobiidae)

   • Saud M. Al-Jufaili
   • Hamid Reza Esmaeili
   • Golnaz Sayyadzadeh

   OriginalPaper 17 September 2021 Pages: 1177 - 1193

   

2. Metabolic growth hypothesis for the evolution of the nuchal hump in swordtail fishes

   • Keith B. Tompkins
   • Meggan S. Lott
   • Molly R. Morris

   OriginalPaper 06 October 2021 Pages: 1195 - 1206

   

3. Saltwater spawning grounds of sea-run brown trout (Salmo trutta) in tidal waters of a major Norwegian river

   • Sven-Erik Gabrielsen
   • Robert J. Lennox
   • Bjørn T. Barlaup

   OriginalPaper Open access 27 September 2021 Pages: 1207 - 1213

   

4. Use of non-lethal endpoints to establish water quality requirements and optima of the endangered Topeka shiner (Notropis topeka)

   • Rory T. Mott
   • Amanda E. Rosenberger
   • Doug Novinger

   OriginalPaper Open access 04 October 2021 Pages: 1215 - 1233

   

5. Responses of fish communities to longitudinal thermal gradients in coldwater, lake outflow streams

   • Nathan Nozzi
   • Robert S. Stelzer

   OriginalPaper 20 September 2021 Pages: 1235 - 1249

   

6. Opportunistic spongivore fishes in a reef of Gulf of Mannar, India

   • Jonathan Samuel Emmett
   • K. Diraviya Raj
   • R. L. Laju

   OriginalPaper 28 September 2021 Pages: 1251 - 1262

   

7. The role of large, glaciated tributaries in cooling an important Pacific salmon migration corridor: a study of the Babine River

   • Kara J. Pitman
   • Jonathan W. Moore

   OriginalPaper 01 October 2021 Pages: 1263 - 1277

   

8. Phylogenetically and morphologically close ambush piscivores can elicit different antipredatory responses in characid prey

   • Taise M. Lopes
   • Rafaela V. Granzotti
   • Luiz C. Gomes

   OriginalPaper 02 October 2021 Pages: 1279 - 1292

   

9. Seasonal formation of annual rings on the scales of Baikal grayling inhabiting the middle reaches of the Yenisei River under altered temperature regime

   • Ivan V. Zuev
   • Pavel Yu. Andrushchenko
   • Tatiana A. Zotina

   OriginalPaper 27 September 2021 Pages: 1293 - 1302

   

10. Seasonal hydrology influences energy channels in food webs of rivers in the lower Okavango Delta

    • Thethela Bokhutlo
    • Friedrich W. Keppeler
    • Kirk O. Winemiller

    OriginalPaper 08 October 2021 Pages: 1303 - 1319

    

11. Diversity and longitudinal distribution of fishes in the Soto La Marina River basin, Mexico, and relationship with environmental variables

    • Gorgonio Ruiz-Campos
    • Ana Verónica Martínez-Vázquez
    • Francisco Javier García-De León

    OriginalPaper 01 October 2021 Pages: 1321 - 1339

    

12. Effect of a non-native freshwater goby invasion on spawning habitat use of two native freshwater gobies

    • Sayaka Ito
    • Yoshinobu Tamura
    • Koji Omori

    OriginalPaper 04 October 2021 Pages: 1341 - 1351

    

13. New records on intestinal eversion in a free-ranging nurse shark (Ginglymostoma cirratum) and a free-ranging, breaching-spotted eagle ray (Aetobatus narinari)

    • Bianca S. Rangel
    • Renan Vignoli
    • Vanessa B. Bettcher

    BriefCommunication 28 September 2021 Pages: 1353 - 1357