3 harsh and threatening in manner or appearance the fierce faces of the players on the opposing hockey team Synonyms austere, dour, grim, flinty, forbidding, gruff, intimidating, lowering (also louring), rough, rugged, severe, stark, steely, stern, ungentleRelated Words bleak, cold, hostile, inhospitable, inimical, unfriendly, unsympathetic; adamant ...
Puffer fish from all other sources potentially contain deadly toxins and therefore are not considered safe. The liver, gonads (ovaries and testes), intestines, and skin of some puffer fish contain the toxins tetrodotoxin and/or saxitoxin.
Water Conditions. Spotted puffer fish are sold as freshwater puffers.. And in parts of their range, they do sometimes live in freshwater. However, they really do their best in brackish water -- water with some salt in it, but less than full-strength seawater. Water with a specific gravity of 1.005 suits them.