constraint on commercial
culture 298-302
grow uniformly and rapidly 302
increased growth potential 290-1
monoculture 291-6
10W0 male progeny discussed 306-7
polyculture 296-8
precautions at Pentecoste, Brazil 285
presence of female hybrids result of
backcrossing 285
problems in selecting parents of pure
strains 282
production 291-8
production problefns 299-302
pure genetic strains the first logical
step 304
reduced fry production discussed 306
research needs 303-4
S. hornorum the most dependable
male parent 303
S. mossambicus x S. hornorum 303
S. mossambicus x S. hornorum crosses
discussed 307
S. niloticus x S. aureus 194,196,
286-7,290,296,302
S. niloticus x S. homorum 192,195,
197,284-88,290-1,294-7,299,
300
S. niloticus x S. hornorum cross
figured 308
tank for pure strains 308
and temperature tolerances 298
theories to explain production 311
various crosses used 310-11
All-male populations, methods to obtain
191
Allopatric speciation, examples 8
general rule among tilapias 331-2
Alocasia macrorhiza, in semi-intensive
cage culture 221,223-4
Altitude, and distribution 34
and failure of introductions 55
and success and failures of intro-
ductions to African lakes 36
Altricial and precocial, use of terms
discussed 82
Altricial and precocial forms, and r and
K selection 72
reproductive values discussed 73
Altricial and precocial life histories 63
Altricial species, in ecological terms a
generalist 67
features of life style
America, introductions 28-31
Amino acids, in diet 154
site of digestion 149
Ammonia, and excretory energy loss 171
high levels and myxobacterial
infections 254
and massive fish kills 40
tolerance by S. aureus 40
Ammonium sulfate, and all-made hybrid
production 292-3,295-6
Anabolic steroids, and growth &cussed
306,315
undetectable 5 days after treatment
&topped 315
Anaphylactic reactions, to compound in
S. mossambicus mucus 260
Androgens, use on a commercial scale
for sex reversal 311
Animal food, in diet of tiiapias 146
Anoxia, following an algal bloom 257
Antibiotics, need for control and legis-
lation 354
indiscriminate use a subject of
concern 261
need for control and legislation 354
Aquaculture, and aggression 149
all-male production and advantage 186
and antibiotics 261
antibiotics discussed 263
bacterial infections 49-50
and breeding behavior 49-50
cage culture 20546
and daily temperature changes 55
detritus important 343
difficulties in assessing performance
181
diurnal migrations and importance of
Dr. Caulton's work 180
Dor Station (Israel) ponds 104
factors affecting ehoice of species 186-7
gonad development inhibited by
prolactin? 136
harvesting before sexual maturity an
advantage 186
integration with agriculture 350
and intraspecific temperature
tolerance 37
and introductions 24
market preference and culture practice
186
means to produce large fish suggested
79
merits of guarders and bearers 77-8