Part 67

46. Do fishes ever go from salt to fresh water?

47. For what reason do some fish leave the sea and ascend rivers?

48. Tell me how air is put into tanks of water for fish.

49. How do fish behave if they have not enough air?

50. How does air get into the water of seas, lakes, and rivers?

51. How do fish sometimes help themselves to surface air?

52. What do fishes eat?

53. What is the basking of fish?

54. How are fishes kept in glass tanks?

55. Tell me of some of the queer ways of fish.

56. What about the fighting of fish?

57. How does a fish act when he darts after his food?

58. What are fish eggs called before they are laid?

59. What are they called when first dropped in the water?

60. What are the little fish called soon after they hatch?

61. What do we mean by a school, or shoal, of fish?

62. What can you tell me about skate and dog-fish eggs?

63. How will you know the egg-sacs of a skate from those of a dog-fish?

64. How do the mackerel and herring leave their eggs?

65. What can you say of the numbers of the eggs of fish?

66. What kind of a nest does the trout make for her eggs?

67. Where and when can you find perch eggs?

68. What can you tell me of the shape and colors of scales?

69. What can you tell me of the scales of the side line of the fish?

70. Of what use is this slipperiness to a fish?

71. Why is it hard for a bird or fish to get a partly swallowed fish from its throat?

72. Tell me about some pretty fish.

73. Have all fishes teeth?